WO2024075481A1 - Superconducting wire material connection structure, and layered structure - Google Patents

Superconducting wire material connection structure, and layered structure Download PDF

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Publication number
WO2024075481A1
WO2024075481A1 PCT/JP2023/033294 JP2023033294W WO2024075481A1 WO 2024075481 A1 WO2024075481 A1 WO 2024075481A1 JP 2023033294 W JP2023033294 W JP 2023033294W WO 2024075481 A1 WO2024075481 A1 WO 2024075481A1
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superconducting wire
superconducting
layer
face
connection structure
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PCT/JP2023/033294
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French (fr)
Japanese (ja)
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智寛 伊東
康太郎 大木
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住友電気工業株式会社
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Publication of WO2024075481A1 publication Critical patent/WO2024075481A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
    • H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
    • H01B12/06—Films or wires on bases or cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/68—Connections to or between superconductive connectors

Definitions

  • Patent Document 1 Japanese Patent Application Laid-Open No. 2013-235699
  • Patent Document 1 describes a superconducting wire connection structure.
  • the superconducting wire connection structure described in Patent Document 1 has a first superconducting wire, a second superconducting wire, a third superconducting wire, and a superconducting bonding layer.
  • the first superconducting wire has a first substrate, a first intermediate layer disposed on the first substrate, and a first superconducting layer disposed on the first intermediate layer.
  • the second superconducting wire has a second substrate, a second intermediate layer disposed on the second substrate, and a second superconducting layer disposed on the second intermediate layer.
  • the third superconducting wire has a third substrate, a third intermediate layer disposed on the third substrate, and a third superconducting layer disposed on the third intermediate layer.
  • the first superconducting wire has a first end face in the longitudinal direction of the first superconducting wire.
  • the first superconducting wire has a first end portion adjacent to the first end face in the longitudinal direction of the first superconducting wire.
  • the second superconducting wire has a second end portion adjacent to the second end face in the longitudinal direction of the second superconducting wire.
  • the first superconducting wire and the second superconducting wire are arranged so that the first end face and the second end face face each other. In this state, the first substrate, the first intermediate layer, and the first superconducting layer face the second substrate, the second intermediate layer, and the second superconducting layer, respectively.
  • the third superconducting wire is arranged so that the third superconducting layer faces the first superconducting layer at the first end and the second superconducting layer at the second end, with a superconducting bonding layer interposed between them.
  • the third superconducting layer is superconductively bonded to the first superconducting layer at the first end and the second superconducting layer at the second end by the superconducting bonding layer.
  • the superconducting wire connection structure disclosed herein comprises a first superconducting wire having a first substrate, a first intermediate layer disposed on the first substrate, and a first superconducting layer disposed on the first intermediate layer, and a second superconducting wire having a second substrate, a second intermediate layer disposed on the second substrate, and a second superconducting layer disposed on the second intermediate layer.
  • the first superconducting wire has a first end face which is an end face in the longitudinal direction of the first superconducting wire.
  • the second superconducting wire has a second end face which is an end face in the longitudinal direction of the second superconducting wire. The first end face and the second end face of the first superconducting wire are engaged with each other, so that the first substrate, the first intermediate layer, and the first superconducting layer face each other, respectively.
  • FIG. 1 is a plan view of a superconducting wire connection structure 100.
  • FIG. 2 is a cross-sectional view taken along line II-II in FIG.
  • FIG. 3 is a plan view of the superconducting wire connection structure 100 in which the third superconducting wire 30 and the connection layer 40 are not shown.
  • FIG. 4 is a manufacturing process diagram of the superconducting wire connection structure 100.
  • FIG. 5 is a plan view of the superconducting wire connection structure 200.
  • FIG. 6 is a cross-sectional view taken along line VI-VI in FIG.
  • FIG. 7 is a plan view of superconducting wire connection structure 200 in which third superconducting wire 30 and connection layer 40 are not shown.
  • FIG. 1 is a plan view of a superconducting wire connection structure 100.
  • FIG. 2 is a cross-sectional view taken along line II-II in FIG.
  • FIG. 3 is a plan view of the superconducting wire connection structure 100 in which the third supercon
  • FIG. 8 is a schematic side view of the laminated structure 300.
  • FIG. 9 is a plan view of a superconducting wire connection structure 100 according to Modification 1 in which the third superconducting wire 30 and the connection layer 40 are omitted.
  • FIG. 10 is a plan view of a superconducting wire connection structure 100 according to Modification 2 in which the third superconducting wire 30 and the connection layer 40 are omitted.
  • FIG. 11 is a plan view of a superconducting wire connection structure 100 according to Modification 3 in which the third superconducting wire 30 and the connection layer 40 are not shown.
  • FIG. 12 is a plan view of a superconducting wire connection structure 100 according to Modification 4 in which the third superconducting wire 30 and the connection layer 40 are not shown.
  • FIG. 9 is a plan view of a superconducting wire connection structure 100 according to Modification 1 in which the third superconducting wire 30 and the connection layer 40 are omitted.
  • FIG. 10 is a plan view
  • FIG. 13 is a plan view of the superconducting wire connection structure 100A.
  • FIG. 14 is a cross-sectional view taken along line XIV-XIV in FIG.
  • FIG. 15 is a cross-sectional view taken along line XV-XV in FIG.
  • FIG. 16 is a manufacturing process diagram of the superconducting wire connection structure 100A.
  • connection part increases.
  • This disclosure has been made in consideration of the problems with the conventional technology described above. More specifically, this disclosure provides a superconducting wire connection structure that can reduce the thickness of the connection while ensuring strength against tensile loads.
  • the superconducting wire connection structure includes a first superconducting wire having a first substrate, a first intermediate layer disposed on the first substrate, and a first superconducting layer disposed on the first intermediate layer, and a second superconducting wire having a second substrate, a second intermediate layer disposed on the second substrate, and a second superconducting layer disposed on the second intermediate layer.
  • the first superconducting wire has a first end face which is an end face in the longitudinal direction of the first superconducting wire.
  • the second superconducting wire has a second end face which is an end face in the longitudinal direction of the second superconducting wire.
  • the first end face and the second end face of the first superconducting wire are engaged with each other, so that the first substrate, the first intermediate layer, and the first superconducting layer face each other, respectively.
  • the superconducting wire connection structure of (1) above it is possible to thin the connection portion while ensuring strength against tensile load.
  • a recess may be provided on the first end face.
  • a protrusion may be provided on the second end face.
  • the first superconducting wire may be connected to the second superconducting wire by engaging the recess and the protrusion with each other.
  • it is possible to make the interface distance between the first end face and the second end face larger than the width of the wire by providing a recess and a protrusion on the first end face and the second end face, respectively.
  • the recesses and protrusions may be composed only of curves in a plan view.
  • the superconducting wire connection structure of (3) above makes it possible to suppress stress concentration when a tensile load is applied.
  • the first end face may be provided with a plurality of first recesses and a plurality of first protrusions.
  • the second end face may be provided with a plurality of second recesses and a plurality of second protrusions.
  • the first recess may be between two adjacent first protrusions in the width direction of the first superconducting wire.
  • the second recess may be between two adjacent second protrusions in the width direction of the second superconducting wire.
  • the first superconducting wire may be connected to the second superconducting wire by the first recess and the second protrusion engaging with each other and the first protrusion and the second recess engaging with each other.
  • the concentration of the tensile load at one point is suppressed, and the interface distance between the first end face and the second end face is larger than the width of the wire, so that the strength against the tensile load can be increased.
  • the first recess, the first protrusion, the second recess, and the second protrusion may be composed only of curves in a plan view. According to the superconducting wire connection structure of (5) above, it is possible to suppress stress concentration when a tensile load is applied.
  • the first end face may have a portion that is inclined with respect to the width direction of the first superconducting wire in a plan view.
  • the second end face may have a portion that is inclined with respect to the width direction of the second superconducting wire in a plan view. According to the superconducting wire connection structure of (6) above, the engagement between the first end face and the second end face can be made more firmly.
  • the superconducting wire connection structure of (1) to (6) above may further include a third superconducting wire and a connection layer.
  • the first superconducting wire may be an end of the first superconducting wire in the longitudinal direction and may have a first end adjacent to the first end face.
  • the second superconducting wire may be an end of the second superconducting wire in the longitudinal direction and may have a second end adjacent to the second end face.
  • the third superconducting wire may have a third substrate, a third intermediate layer disposed on the third substrate, and a third superconducting layer disposed on the third intermediate layer.
  • the third superconducting layer may be superconductively joined to the first superconducting layer at the first end and the second superconducting layer at the second end via a connection layer. According to the superconducting wire connection structure of (6) above, it is possible to pass a large current from the first superconducting layer to the second superconducting layer via the third superconducting layer.
  • the first intermediate layer and the first superconducting layer at both ends of the first end in the width direction of the first superconducting wire may be removed.
  • the second intermediate layer and the second superconducting layer at both ends of the second end in the width direction of the second superconducting wire may be removed.
  • the third intermediate layer and the third superconducting layer at both ends in the width direction of the third superconducting wire may be removed.
  • Both ends of the third substrate in the width direction of the third superconducting wire may be welded to the first substrate at both ends of the first end in the width direction of the first superconducting wire, and may be welded to the second substrate at both ends of the second end in the width direction of the second superconducting wire.
  • the laminated structure according to the embodiment includes a plurality of superconducting wire connection structures.
  • the superconducting wire connection structure includes a first superconducting wire having a first substrate, a first intermediate layer disposed on the first substrate, and a first superconducting layer disposed on the first intermediate layer, and a second superconducting wire having a second substrate, a second intermediate layer disposed on the second substrate, and a second superconducting layer disposed on the second intermediate layer.
  • the first superconducting wire has a first end face which is an end face in the longitudinal direction of the first superconducting wire.
  • the second superconducting wire has a second end face which is an end face in the longitudinal direction of the second superconducting wire.
  • the first end face and the second end face of the first superconducting wire are engaged with each other, so that the first substrate, the first intermediate layer, and the first superconducting layer face each other, respectively.
  • the plurality of superconducting wire connection structures are arranged in a stacked manner.
  • the superconducting wire connection structure according to the first embodiment is referred to as a superconducting wire connection structure 100.
  • the superconducting wire connection structure 100 has a first superconducting wire 10, a second superconducting wire 20, a third superconducting wire 30, and a connection layer 40.
  • the first superconducting wire 10 has a first substrate 11, a first intermediate layer 12, and a first superconducting layer 13.
  • the first substrate 11 is, for example, a clad material having a tape member made of stainless steel, a copper (Cu) layer disposed on the tape member, and a nickel (Ni) layer disposed on the copper layer.
  • the first substrate 11 may be, for example, a tape member made of Hastelloy (registered trademark).
  • the first intermediate layer 12 is disposed on the first substrate 11.
  • the first intermediate layer 12 is disposed on the nickel layer of the first substrate 11.
  • the first intermediate layer 12 has, for example, an yttria (Y 2 O 3 ) layer, an yttria-stabilized zirconia (YSZ) layer disposed on the yttria layer, and a cerium oxide (CeO 2 ) layer disposed on the yttria-stabilized zirconia layer.
  • the first superconducting layer 13 is disposed on the first intermediate layer 12.
  • the constituent material of the first superconducting layer 13 is an oxide superconductor.
  • the oxide superconductor is, for example, REBCO.
  • REBCO is REBa 2 Cu 3 O 7-y (RE is a rare earth element).
  • RE is a rare earth element.
  • a specific example of the rare earth element is gadolinium, but is not limited to this.
  • the second superconducting wire 20 has a second substrate 21, a second intermediate layer 22, and a second superconducting layer 23.
  • the second substrate 21 is, for example, a clad material having a tape member made of stainless steel, a copper layer disposed on the tape member, and a nickel layer disposed on the copper layer.
  • the second substrate 21 may be, for example, a tape member made of Hastelloy.
  • the second intermediate layer 22 is disposed on the second substrate 21.
  • the second intermediate layer 22 is disposed on the nickel layer of the second substrate 21.
  • the second intermediate layer 22 has, for example, an yttria layer, an yttria-stabilized zirconia layer disposed on the yttria layer, and a cerium oxide layer disposed on the yttria-stabilized zirconia layer.
  • the second superconducting layer 23 is disposed on the second intermediate layer 22.
  • the constituent material of the second superconducting layer 23 is an oxide superconductor.
  • the oxide superconductor is, for example, REBCO.
  • the first superconducting wire 10 has a first end face 10a in the longitudinal direction of the first superconducting wire 10.
  • the first superconducting wire 10 has a first end face 10b in the longitudinal direction of the first superconducting wire 10.
  • the first end face 10b is adjacent to the first end face 10a.
  • the second superconducting wire 20 has a second end face 20a in the longitudinal direction of the second superconducting wire 20.
  • the second superconducting wire 20 has a second end face 20b in the longitudinal direction of the second superconducting wire 20.
  • the second end face 20b is adjacent to the second end face 20a.
  • the longitudinal direction of the first superconducting wire 10 and the longitudinal direction of the second superconducting wire 20 are aligned along the first direction DR1.
  • the second direction DR2 is perpendicular to the first direction DR1.
  • the width direction of the first superconducting wire 10 and the width direction of the second superconducting wire 20 are aligned along the second direction DR2.
  • the first superconducting wire 10 is connected to the second superconducting wire 20 by engaging the first end face 10a with the second end face 20a.
  • the first end face 10a being engaged with the second end face 20a means that the first end face 10a and the second end face 20a are kept in contact with each other against a load along the first direction DR1, so that the relative position of the first superconducting wire 10 in the first direction DR1 with respect to the second superconducting wire 20 does not change.
  • the first substrate 11, the first intermediate layer 12, and the first superconducting layer 13 face the second substrate 21, the second intermediate layer 22, and the second superconducting layer 23, respectively.
  • the first end face 10a has a plurality of first recesses 10c.
  • the first recesses 10c penetrate the first superconducting wire 10 along the thickness direction. More specifically, the first recesses 10c penetrate the first substrate 11, the first intermediate layer 12, and the first superconducting layer 13.
  • the first recesses 10c are arranged at intervals in the second direction DR2.
  • the width of the first recesses 10c in the second direction DR2 becomes smaller as it approaches the first end face 10a.
  • the portion of the first superconducting wire 10 between two adjacent first recesses 10c becomes the first convex portion 10d. Therefore, the width of the first convex portion 10d in the second direction DR2 becomes larger as it approaches the first end face 10a.
  • the width of the first recess 10c in the second direction DR2 is maximum at the bottom side of the first recess 10c (see width W11 in FIG. 3) and minimum at the opening side of the first recess 10c (see width W12 in FIG. 3), and the width of the first convex portion 10d in the second direction DR2 is maximum at the tip side of the first convex portion 10d (see width W21 in FIG. 3) and minimum at the base side of the first convex portion 10d (see width W22 in FIG. 3).
  • the second end face 20a has a plurality of second recesses 20c.
  • the second recesses 20c penetrate the second superconducting wire 20 along the thickness direction. More specifically, the second recesses 20c penetrate the second substrate 21, the second intermediate layer 22, and the second superconducting layer 23.
  • the second recesses 20c are arranged at intervals in the second direction DR2.
  • the width of the second recesses 20c in the second direction DR2 decreases as it approaches the second end face 20a.
  • the portion of the second superconducting wire 20 between two adjacent second recesses 20c becomes the second convex portion 20d. Therefore, the width of the second convex portion 20d in the second direction DR2 increases as it approaches the second end face 20a.
  • the width of the second recess 20c in the second direction DR2 is maximum at the bottom side of the second recess 20c (see width W31 in FIG. 3) and minimum at the opening side of the second recess 20c (see width W32 in FIG. 3), and the width of the second convex portion 20d in the second direction DR2 is maximum at the tip side of the second convex portion 20d (see width W41 in FIG. 3) and minimum at the base side of the second convex portion 20d (see width W42 in FIG. 3).
  • the first convex portion 10d engages with the second concave portion 20c.
  • the second convex portion 20d engages with the first concave portion 10c.
  • the first end face 10a and the second end face 20a engage with each other, and the first superconducting wire 10 is connected to the second superconducting wire 20.
  • the width of the first recess 10c in the second direction DR2 decreases as it moves away from the bottom of the first recess 10c, and the width of the second protrusion 20d in the second direction DR2 increases as it moves closer to the tip of the second protrusion 20d. Therefore, even if a tensile load along the first direction DR1 is applied to the superconducting wire connection structure 100, the second protrusion 20d does not come out of the first recess 10c.
  • the width of the first protrusion 10d in the second direction DR2 increases as it moves closer to the tip of the first protrusion 10d, and the width of the second recess 20c in the second direction DR2 decreases as it moves away from the bottom of the second recess 20c. Therefore, even if a tensile load along the first direction DR1 is applied to the superconducting wire connection structure 100, the first protrusion 10d does not come out of the second recess 20c.
  • the shape of the first recess 10c and the shape of the first protrusion 10d in plan view are preferably made up of curves only.
  • the shape of the second recess 20c and the shape of the second protrusion 20d in plan view are preferably made up of curves only.
  • the third superconducting wire 30 has a third substrate 31, a third intermediate layer 32, and a third superconducting layer 33.
  • the third substrate 31 is, for example, a clad material having a tape member made of stainless steel, a copper layer disposed on the tape member, and a nickel layer disposed on the copper layer.
  • the third substrate 31 may be, for example, a tape member made of Hastelloy.
  • the third intermediate layer 32 is disposed on the third substrate 31.
  • the third intermediate layer 32 is disposed on the nickel layer of the third substrate 31.
  • the third intermediate layer 32 has, for example, an yttria layer, an yttria-stabilized zirconia layer disposed on the yttria layer, and a cerium oxide layer disposed on the yttria-stabilized zirconia layer.
  • the third superconducting layer 33 is disposed on the third intermediate layer 32.
  • the constituent material of the third superconducting layer 33 is an oxide superconductor.
  • the oxide superconductor is, for example, REBCO.
  • the third superconducting wire 30 is arranged so that the third superconducting layer 33 faces the first superconducting layer 13 at the first end 10b and the second superconducting layer 23 at the second end 20b, with the connecting layer 40 interposed therebetween.
  • connection layer 40 The material of the connection layer 40 is REBCO.
  • the REBCO crystals constituting the connection layer 40 are epitaxially grown from the REBCO crystals constituting the first superconducting layer 13 at the first end 10b, and also from the REBCO crystals constituting the second superconducting layer 23 at the second end 20b.
  • the REBCO crystals constituting the connection layer 40 are epitaxially grown from the REBCO crystals constituting the third superconducting layer 33. Therefore, the third superconducting layer 33 is superconductively joined to the first superconducting layer 13 at the first end 10b and the second superconducting layer 23 at the second end 20b by the connection layer 40.
  • the first superconducting wire 10 may further have a first stabilization layer 14.
  • the first stabilization layer 14 is disposed on the first superconducting layer 13.
  • the first superconducting wire 10 may have a first protective layer (not shown) disposed on the first stabilization layer 14.
  • the first superconducting wire 10 may not have a first protective layer.
  • the first stabilization layer 14 and the first protective layer are removed on the first superconducting layer 13 at the first end 10b.
  • the material of the first stabilization layer 14 is, for example, copper or a copper alloy.
  • the material of the first protective layer is, for example, silver or a silver alloy.
  • the second superconducting wire 20 may further have a second stabilizing layer 24.
  • the second stabilizing layer 24 is disposed on the second superconducting layer 23.
  • the second superconducting wire 20 may have a second protective layer (not shown) disposed on the second stabilizing layer 24.
  • the second superconducting wire 20 may not have a second protective layer.
  • the second stabilizing layer 24 and the second protective layer are removed on the second superconducting layer 23 at the second end 20b.
  • the second stabilizing layer 24 is made of, for example, copper or a copper alloy.
  • the second protective layer is made of, for example, silver or a silver alloy.
  • the method for manufacturing the superconducting wire connection structure 100 includes a preparation step S1, an end face processing step S2, a microcrystalline layer formation step S3, an end face engagement step S4, a superconducting joining step S5, and an oxygen reintroduction step S6.
  • the preparation step S1 the first superconducting wire 10, the second superconducting wire 20, and the third superconducting wire 30 are prepared. After the preparation step S1, the end face processing step S2 and the microcrystalline layer forming step S3 are performed.
  • a first recess 10c and a first protrusion 10d are formed on the first end face 10a.
  • the first recess 10c and the first protrusion 10d are formed by irradiating a laser near the first end face 10a to partially remove the first superconducting wire 10.
  • a second recess 20c and a second protrusion 20d are formed on the second end face 20a.
  • the second recess 20c and the second protrusion 20d are formed by the same method as the first recess 10c and the first protrusion 10d.
  • a microcrystalline layer 50 (not shown) is formed on the third superconducting layer 33.
  • an organic compound film is formed on the third superconducting layer 33 by, for example, spin coating.
  • the organic compound film contains the constituent elements of REBCO.
  • the organic compound film is pre-fired. By pre-fired, the organic compound film becomes a precursor of REBCO.
  • the organic compound film that has been pre-fired is called a pre-fired film.
  • the pre-fired film is heat-treated. As a result, the carbides contained in the pre-fired film are decomposed, and a microcrystalline layer 50 containing microcrystals of REBCO is formed.
  • the end face engagement step S4 is performed.
  • the first superconducting wire 10 is connected to the second superconducting wire 20 by engaging the first end face 10a with the second end face 20a.
  • the engagement between the first end face 10a and the second end face 20a is performed by sliding the first superconducting wire 10 along the thickness direction of the second superconducting wire 20 with the first recess 10c overlapping the second protrusion 20d and the first protrusion 10d overlapping the second recess 20c in a plan view.
  • the superconducting joining process S5 is performed.
  • the third superconducting layer 33 is superconductively joined to the first superconducting layer 13 at the first end 10b and the second superconducting layer 23 at the second end 20b by the connection layer 40.
  • the third superconducting wire 30 is arranged so that the third superconducting layer 33 faces the first superconducting layer 13 at the first end 10b and the second superconducting layer 23 at the second end 20b with the microcrystalline layer 50 interposed therebetween.
  • the first superconducting layer 13 at the first end 10b, the second superconducting layer 23 at the second end 20b, the third superconducting layer 33, and the microcrystalline layer 50 are heated and pressurized.
  • the REBCO microcrystals contained in the microcrystalline layer 50 are oriented and crystallized (epitaxially grown from the first superconducting layer 13 at the first end 10b, and the second superconducting layer 23 and the third superconducting layer 33 at the second end 20b) to become the connection layer 40.
  • the superconducting wire connection structure 100 having the structure shown in Figures 1 to 3 is formed.
  • the heating performed in the superconducting joining step S5 causes oxygen to be desorbed from the REBCO constituting the first superconducting layer 13 at the first end 10b, the REBCO constituting the second superconducting layer 23 at the second end 20b, the REBCO constituting the third superconducting layer 33, and the REBCO constituting the connection layer 40.
  • the superconducting wire connection structure 100 is heated and held in an oxygen-containing atmosphere, so that oxygen is reintroduced into the REBCO constituting the first superconducting layer 13 at the first end 10b, the REBCO constituting the second superconducting layer 23 at the second end 20b, the REBCO constituting the third superconducting layer 33, and the REBCO constituting the connection layer 40.
  • ⁇ Effects of superconducting wire connection structure 100> The effects of the superconducting wire connection structure 100 will be described below in comparison with a superconducting wire connection structure according to a comparative example.
  • the superconducting wire connection structure according to the comparative example is referred to as a superconducting wire connection structure 200.
  • the configuration of the superconducting wire connection structure 200 is the same as the configuration of the superconducting wire connection structure 100, except that the first end face 10a is not engaged with the second end face 20a, but is merely in contact with the second end face 20a.
  • the first end face 10a and the second end face 20a are not engaged, and therefore the first superconducting wire 10 and the second superconducting wire 20 are connected only via the connection layer 40. Therefore, reinforcement is required to ensure the strength of the superconducting wire connection structure 200 against the tensile load along the first direction DR1.
  • the third superconducting wire 30 and the first end 10b and the second end 20b are sandwiched between the first reinforcing member and the second reinforcing member, and reinforcement is required to fix the first reinforcing member and the second reinforcing member to each other, which results in a thick connection portion.
  • the superconducting wire connection structure 100 the first end face 10a and the second end face 20a are engaged, so that the strength against the tensile load along the first direction DR1 is ensured even without the above-mentioned reinforcement. Therefore, the superconducting wire connection structure 100 can be made thin while ensuring the strength against the tensile load.
  • the first superconducting layer 13 and the second superconducting layer 23 are superconductively joined to the third superconducting layer 33 by the connection layer 40, so that a large current can be passed from the first superconducting layer 13 to the second superconducting layer 23 via the third superconducting layer 33.
  • the superconducting wire connection structures 100 are stacked to form a laminated structure 300.
  • the superconducting wire connection structures 100 can be made thin, so even if the laminated structure 300 is formed by stacking superconducting wire connection structures 100, it is possible to suppress an increase in thickness.
  • the first convex portion 10d is engaged with the second concave portion 20c, and the second convex portion 20d is engaged with the first concave portion 10c, thereby engaging the first end face 10a and the second end face 20a. That is, in the superconducting wire connection structure 100, the tensile load along the first direction DR1 is supported at multiple points, and is prevented from concentrating at one point.
  • the shape of the first concave portion 10c, the shape of the first convex portion 10d, the shape of the second concave portion 20c, and the shape of the second convex portion 20d are composed of only curves in a plan view, so that stress concentration is suppressed when a tensile load along the first direction DR1 is applied. Furthermore, in the superconducting wire connection structure 100, the interface distance between the first end face 10a and the second end face 20a is greater than the width of the first superconducting wire 10 and the width of the second superconducting wire 20. Therefore, according to the superconducting wire connection structure 100, it is possible to increase the strength against the tensile load along the first direction DR1.
  • the first end face 10a and the second end face 20a can be engaged by fitting the first convex portion 10d into the second concave portion 20c and the second convex portion 20d into the first concave portion 10c, so that the first end face 10a and the second end face 20a can be easily engaged.
  • oxygen reintroduction step S6 oxygen is supplied through the boundary between the first end face 10a and the second end face 20a to the first superconducting layer 13 at the first end face 10b, the second superconducting layer 23 at the second end face 20b, the third superconducting layer 33, and the connection layer 40.
  • the area of the boundary between the first end face 10a and the second end face 20a is larger than that in the superconducting wire connection structure 200, so that in the oxygen reintroduction step S6, oxygen is more easily supplied to the first superconducting layer 13 at the first end face 10b, the second superconducting layer 23 at the second end face 20b, the third superconducting layer 33, and the connection layer 40.
  • one recess 10e may be formed on the first end face 10a instead of the plurality of first recesses 10c and the plurality of first protrusions 10d
  • one protrusion 20e may be formed on the second end face 20a instead of the plurality of second recesses 20c and the plurality of second protrusions 20d.
  • the first end face 10a and the second end face 20a are engaged with each other by engaging the protrusion 20e with the recess 10e.
  • the shape of the first recess 10c, the shape of the first protrusion 10d, the shape of the second recess 20c, and the shape of the second protrusion 20d may be composed of straight lines only. From another perspective, the shape of the first recess 10c, the shape of the first protrusion 10d, the shape of the second recess 20c, and the shape of the second protrusion 20d may be trapezoidal in plan view.
  • the shape of the first recess 10c, the shape of the first protrusion 10d, the shape of the second recess 20c, and the shape of the second protrusion 20d may be configured by a combination of straight lines and curves.
  • the first end face 10a and the second end face 20a may be inclined with respect to the second direction DR2 in a plan view.
  • the first end face 10a and the second end face 20a may have a portion inclined with respect to the second direction DR2 at a first angle and a portion inclined with respect to the second direction DR2 at a second angle different from the first angle.
  • the area of the first end face 10a and the area of the second end face 20a are increased, so that the first end face 10a and the second end face 20a are more firmly engaged with each other.
  • the superconducting wire connection structure according to the second embodiment is referred to as a superconducting wire connection structure 100A.
  • differences from the superconducting wire connection structure 100 will be mainly described, and overlapping descriptions will not be repeated.
  • superconducting wire connection structure 100A has a first superconducting wire 10, a second superconducting wire 20, a third superconducting wire 30, and a connection layer 40.
  • first end face 10a and second end face 20a are engaged with each other, thereby connecting first superconducting wire 10 to second superconducting wire 20.
  • the configuration of superconducting wire connection structure 100A is common to the configuration of superconducting wire connection structure 100.
  • the first intermediate layer 12 and the first superconducting layer 13 at both ends of the first end 10b in the second direction DR2 have been removed.
  • the second intermediate layer 22 and the second superconducting layer 23 at both ends of the second end 20b in the second direction DR2 have been removed.
  • the third intermediate layer 32 and the third superconducting layer 33 at both ends in the second direction DR2 have been removed.
  • the third substrates 31 at both ends in the second direction DR2 are joined to the first substrates 11 at both ends of the first end 10b in the second direction DR2 by welds 61.
  • the third substrates 31 at both ends in the second direction DR2 are joined to the second substrates 21 at both ends of the second end 20b in the second direction DR2 by welds 62.
  • the configuration of the superconducting wire connection structure 100A differs from the configuration of the superconducting wire connection structure 100.
  • the method for manufacturing the superconducting wire connection structure 100A includes a preparation step S1, an end face processing step S2, a microcrystalline layer forming step S3, an end face engagement step S4, a superconducting joining step S5, and an oxygen reintroduction step S6.
  • the method for manufacturing the superconducting wire connection structure 100A is common to the method for manufacturing the superconducting wire connection structure 100.
  • the manufacturing method of the superconducting wire connection structure 100A further includes a removal step S7 and a welding step S8.
  • the removal step S7 the first intermediate layer 12 and the first superconducting layer 13 at both ends of the first end 10b in the width direction of the first superconducting wire 10 are removed, and the second intermediate layer 22 and the second superconducting layer 23 at both ends of the second end 20b in the width direction of the second superconducting wire 20 are removed.
  • the third intermediate layer 32 and the third superconducting layer 33 at both ends in the width direction of the third superconducting wire 30 are further removed.
  • the welding process S8 is performed after the end face engagement process S4 and before the superconducting joining process S5.
  • spot welding is performed, so that the partially melted first substrate 11 and third substrate 31 are mixed and solidified to form a welded portion 61.
  • spot welding is performed, so that the partially melted second substrate 21 and third substrate 31 are mixed and solidified to form a welded portion 62.
  • the manufacturing method of the superconducting wire connection structure 100A differs from the manufacturing method of the superconducting wire connection structure 100.
  • the tensile load along the first direction DR1 is supported by the joining of the first substrate 11 and the third substrate 31 by the weld 61 and the joining of the second substrate 21 and the third substrate 31 by the weld 62, so that strength against the tensile load along the first direction DR1 is further ensured.
  • 100 superconducting wire connection structure 10 first superconducting wire, 10a first end face, 10b first end, 10c first recess, 10d first convex, 10e recess, 11 first substrate, 12 first intermediate layer, 13 first superconducting layer, 14 first stabilization layer, 20 second superconducting wire, 20a second end face, 20b second end, 20c second recess, 20d second convex, 20e convex, 21 second substrate, 22 second intermediate layer, 23 second superconducting layer, 24 second stabilization layer, 30 third superconducting wire, 31 third substrate material, 32 third intermediate layer, 33 third superconducting layer, 40 connection layer, 50 microcrystalline layer, 61, 62 welded portion, 100A superconducting wire connection structure, 200 superconducting wire connection structure, 300 laminated structure, DR1 first direction, DR2 second direction, S1 preparation process, S2 end face processing process, S3 microcrystalline layer formation process, S4 end face engagement process, S5 superconducting joining process, S6 oxygen reintr

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Abstract

This superconducting wire material connection structure is equipped with: a first superconducting wire material which has a first substrate, a first intermediate layer positioned on the first substrate, and a first superconducting layer positioned on the first intermediate layer; and a second superconducting wire material which has a second substrate, a second intermediate layer positioned on the second substrate, and a second superconducting layer positioned on the second intermediate layer. The first superconducting wire material has a first end surface, which is an end surface of the first superconducting wire material in the lengthwise direction. The second superconducting wire material has a second end surface, which is an end surface of the second superconducting wire material in the lengthwise direction. As a result of joining the first end surface and the second end surface to one another, the first superconducting wire material is connected to the second superconducting wire material in a manner such that the first substrate, the first intermediate layer and the first superconducting layer respectively face the second substrate, the second intermediate layer and the second superconducting layer.

Description

超電導線材接続構造及び積層構造体Superconducting wire joint structure and laminated structure
　本開示は、超電導線材接続構造及び積層構造体に関する。本出願は、２０２２年１０月４日に出願した日本特許出願である特願２０２２－１６０３６３号に基づく優先権を主張する。当該日本特許出願に記載された全ての記載内容は、参照によって本明細書に援用される。 This disclosure relates to a superconducting wire connection structure and a laminated structure. This application claims priority to Japanese Patent Application No. 2022-160363, filed on October 4, 2022. All contents of said Japanese patent application are incorporated herein by reference.
　例えば特開２０１３－２３５６９９号公報（特許文献１）には、超電導線材接続構造が記載されている。特許文献１に記載の超電導線材接続構造は、第１超電導線材と、第２超電導線材と、第３超電導線材と、超電導接合層とを有している。第１超電導線材は、第１基材、第１基材上に配置されている第１中間層及び第１中間層上に配置されている第１超電導層を有している。第２超電導線材は、第２基材、第２基材上に配置されている第２中間層及び第２中間層上に配置されている第２超電導層を有している。第３超電導線材は、第３基材、第３基材上に配置されている第３中間層及び第３中間層上に配置されている第３超電導層を有している。 For example, Japanese Patent Application Laid-Open No. 2013-235699 (Patent Document 1) describes a superconducting wire connection structure. The superconducting wire connection structure described in Patent Document 1 has a first superconducting wire, a second superconducting wire, a third superconducting wire, and a superconducting bonding layer. The first superconducting wire has a first substrate, a first intermediate layer disposed on the first substrate, and a first superconducting layer disposed on the first intermediate layer. The second superconducting wire has a second substrate, a second intermediate layer disposed on the second substrate, and a second superconducting layer disposed on the second intermediate layer. The third superconducting wire has a third substrate, a third intermediate layer disposed on the third substrate, and a third superconducting layer disposed on the third intermediate layer.
　第１超電導線材は、第１超電導線材の長手方向において、第１端面を有している。第１超電導線材は、第１超電導線材の長手方向において、第１端面に隣接している第１端部を有している。第２超電導線材は、第２超電導線材の長手方向において、第２端面を有している。第２超電導線材は、第２超電導線材の長手方向において、第２端面に隣接している第２端部を有している。第１超電導線材及び第２超電導線材は、第１端面及び第２端面が互いに対向するように配置されている。この状態において、第１基材、第１中間層及び第１超電導層は、それぞれ第２基材、第２中間層及び第２超電導層に向かい合っている。 The first superconducting wire has a first end face in the longitudinal direction of the first superconducting wire. The first superconducting wire has a first end portion adjacent to the first end face in the longitudinal direction of the first superconducting wire. The second superconducting wire has a second end portion adjacent to the second end face in the longitudinal direction of the second superconducting wire. The first superconducting wire and the second superconducting wire are arranged so that the first end face and the second end face face each other. In this state, the first substrate, the first intermediate layer, and the first superconducting layer face the second substrate, the second intermediate layer, and the second superconducting layer, respectively.
　第３超電導線材は、第３超電導層が超電導接合層を介在させて第１端部にある第１超電導層及び第２端部にある第２超電導層と対向するように、配置されている。第３超電導層は、超電導接合層により、第１端部にある第１超電導層及び第２端部にある第２超電導層に超電導接合されている。 The third superconducting wire is arranged so that the third superconducting layer faces the first superconducting layer at the first end and the second superconducting layer at the second end, with a superconducting bonding layer interposed between them. The third superconducting layer is superconductively bonded to the first superconducting layer at the first end and the second superconducting layer at the second end by the superconducting bonding layer.
特開２０１３－２３５６９９号公報JP 2013-235699 A
　本開示の超電導線材接続構造は、第１基材、第１基材上に配置されている第１中間層及び第１中間層上に配置されている第１超電導層を有する第１超電導線材と、第２基材、第２基材上に配置されている第２中間層及び第２中間層上に配置されている第２超電導層を有する第２超電導線材とを備える。第１超電導線材は、第１超電導線材の長手方向における端面である第１端面を有する。第２超電導線材は、第２超電導線材の長手方向における端面である第２端面を有する。第１超電導線材は、第１端面及び第２端面が互いに係合することにより、第１基材、第１中間層及び第１超電導層がそれぞれ第２基材、第２中間層及び第２超電導層と互いに向かい合うように第２超電導線材に接続されている。 The superconducting wire connection structure disclosed herein comprises a first superconducting wire having a first substrate, a first intermediate layer disposed on the first substrate, and a first superconducting layer disposed on the first intermediate layer, and a second superconducting wire having a second substrate, a second intermediate layer disposed on the second substrate, and a second superconducting layer disposed on the second intermediate layer. The first superconducting wire has a first end face which is an end face in the longitudinal direction of the first superconducting wire. The second superconducting wire has a second end face which is an end face in the longitudinal direction of the second superconducting wire. The first end face and the second end face of the first superconducting wire are engaged with each other, so that the first substrate, the first intermediate layer, and the first superconducting layer face each other, respectively.
図１は、超電導線材接続構造１００の平面図である。FIG. 1 is a plan view of a superconducting wire connection structure 100. As shown in FIG. 図２は、図１中のＩＩ－ＩＩにおける断面図である。FIG. 2 is a cross-sectional view taken along line II-II in FIG. 図３は、第３超電導線材３０及び接続層４０の図示を省略した超電導線材接続構造１００の平面図である。FIG. 3 is a plan view of the superconducting wire connection structure 100 in which the third superconducting wire 30 and the connection layer 40 are not shown. 図４は、超電導線材接続構造１００の製造工程図である。FIG. 4 is a manufacturing process diagram of the superconducting wire connection structure 100. 図５は、超電導線材接続構造２００の平面図である。FIG. 5 is a plan view of the superconducting wire connection structure 200. As shown in FIG. 図６は、図５中のＶＩ－ＶＩにおける断面図である。FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 図７は、第３超電導線材３０及び接続層４０の図示を省略した超電導線材接続構造２００の平面図である。FIG. 7 is a plan view of superconducting wire connection structure 200 in which third superconducting wire 30 and connection layer 40 are not shown. 図８は、積層構造体３００の模式的な側面図である。FIG. 8 is a schematic side view of the laminated structure 300. 図９は、第３超電導線材３０及び接続層４０の図示が省略された変形例１に係る超電導線材接続構造１００の平面図である。FIG. 9 is a plan view of a superconducting wire connection structure 100 according to Modification 1 in which the third superconducting wire 30 and the connection layer 40 are omitted. 図１０は、第３超電導線材３０及び接続層４０の図示が省略された変形例２に係る超電導線材接続構造１００の平面図である。FIG. 10 is a plan view of a superconducting wire connection structure 100 according to Modification 2 in which the third superconducting wire 30 and the connection layer 40 are omitted. 図１１は、第３超電導線材３０及び接続層４０の図示が省略された変形例３に係る超電導線材接続構造１００の平面図である。FIG. 11 is a plan view of a superconducting wire connection structure 100 according to Modification 3 in which the third superconducting wire 30 and the connection layer 40 are not shown. 図１２は、第３超電導線材３０及び接続層４０の図示が省略された変形例４に係る超電導線材接続構造１００の平面図である。FIG. 12 is a plan view of a superconducting wire connection structure 100 according to Modification 4 in which the third superconducting wire 30 and the connection layer 40 are not shown. 図１３は、超電導線材接続構造１００Ａの平面図である。FIG. 13 is a plan view of the superconducting wire connection structure 100A. 図１４は、図１３中のＸＩＶ－ＸＩＶにおける断面図である。FIG. 14 is a cross-sectional view taken along line XIV-XIV in FIG. 図１５は、図１３中のＸＶ－ＸＶにおける断面図である。FIG. 15 is a cross-sectional view taken along line XV-XV in FIG. 図１６は、超電導線材接続構造１００Ａの製造工程図である。FIG. 16 is a manufacturing process diagram of the superconducting wire connection structure 100A.
　［本開示が解決しようとする課題］
　特許文献１に記載の超電導線材接続構造では、第１超電導線材と第２超電導線材との接続が、超電導接合層を介して行われているに過ぎない。そのため、特許文献１に記載の超電導線材接続構造では、第１超電導線材（第２超電導線材）の長手方向に沿う引張荷重に対する強度に関してさらなる向上が望まれる。 [Problem to be solved by this disclosure]
In the superconducting wire connection structure described in Patent Document 1, the first superconducting wire and the second superconducting wire are connected simply via a superconducting bonding layer. Therefore, in the superconducting wire connection structure described in Patent Document 1, it is desired to further improve the strength against a tensile load along the longitudinal direction of the first superconducting wire (second superconducting wire).
　これに対する補強のために、第１補強部材及び第２補強部材により第３超電導線材、第１端部及び第２端部を挟み込むとともに第１補強部材及び第２補強部材を相互に固定することが考えられる。しかしながら、この場合、接続部の厚さが増加してしまう。 To counter this, it is possible to sandwich the third superconducting wire, the first end, and the second end between the first reinforcing member and the second reinforcing member, and to fix the first reinforcing member and the second reinforcing member to each other. However, in this case, the thickness of the connection part increases.
　本開示は、上記のような従来技術の問題点に鑑みてなされたものである。より具体的には、本開示は、引張荷重に対する強度を確保しつつ、接続部を薄型化することが可能な超電導線材接続構造を提供するものである。 This disclosure has been made in consideration of the problems with the conventional technology described above. More specifically, this disclosure provides a superconducting wire connection structure that can reduce the thickness of the connection while ensuring strength against tensile loads.
　［本開示の効果］
　本開示の超電導線材接続構造によると、引張荷重に対する強度を確保しつつ、接続部を薄型化することが可能である。 [Effects of the present disclosure]
According to the superconducting wire connection structure of the present disclosure, it is possible to reduce the thickness of the connection portion while ensuring strength against tensile load.
　［本開示の実施形態の説明］
　まず、本開示の実施形態を列記して説明する。 [Description of the embodiments of the present disclosure]
First, embodiments of the present disclosure will be listed and described.
　（１）実施形態に係る超電導線材接続構造は、第１基材、第１基材上に配置されている第１中間層及び第１中間層上に配置されている第１超電導層を有する第１超電導線材と、第２基材、第２基材上に配置されている第２中間層及び第２中間層上に配置されている第２超電導層を有する第２超電導線材とを備えている。第１超電導線材は、第１超電導線材の長手方向における端面である第１端面を有する。第２超電導線材は、第２超電導線材の長手方向における端面である第２端面を有する。第１超電導線材は、第１端面及び第２端面が互いに係合することにより、第１基材、第１中間層及び第１超電導層がそれぞれ第２基材、第２中間層及び第２超電導層と互いに向かい合うように第２超電導線材に接続されている。上記（１）の超電導線材接続構造によると、引張荷重に対する強度を確保しつつ接続部を薄型化することが可能である。 (1) The superconducting wire connection structure according to the embodiment includes a first superconducting wire having a first substrate, a first intermediate layer disposed on the first substrate, and a first superconducting layer disposed on the first intermediate layer, and a second superconducting wire having a second substrate, a second intermediate layer disposed on the second substrate, and a second superconducting layer disposed on the second intermediate layer. The first superconducting wire has a first end face which is an end face in the longitudinal direction of the first superconducting wire. The second superconducting wire has a second end face which is an end face in the longitudinal direction of the second superconducting wire. The first end face and the second end face of the first superconducting wire are engaged with each other, so that the first substrate, the first intermediate layer, and the first superconducting layer face each other, respectively. According to the superconducting wire connection structure of (1) above, it is possible to thin the connection portion while ensuring strength against tensile load.
　（２）上記（１）の超電導線材接続構造では、第１端面に、凹部が設けられていてもよい。第２端面には、凸部が設けられていてもよい。第１超電導線材は、凹部及び凸部が互いに係合することにより、第２超電導線材に接続されていてもよい。上記（２）の超電導線材接続構造によると、凹部及び凸部を嵌め合わせることにより第１端面と第２端面とを容易に係合させることが可能である。また、上記（２）の超電導線材接続構造によると、第１端面及び第２端面にそれぞれ凹部及び凸部を設けることにより第１端面と第２端面との間の界面距離を線材の幅よりも大きくすることが可能である。 (2) In the superconducting wire connection structure of (1) above, a recess may be provided on the first end face. A protrusion may be provided on the second end face. The first superconducting wire may be connected to the second superconducting wire by engaging the recess and the protrusion with each other. According to the superconducting wire connection structure of (2) above, it is possible to easily engage the first end face and the second end face by fitting the recess and the protrusion. Also, according to the superconducting wire connection structure of (2) above, it is possible to make the interface distance between the first end face and the second end face larger than the width of the wire by providing a recess and a protrusion on the first end face and the second end face, respectively.
　（３）上記（２）の超電導線材接続構造では、凹部及び凸部が平面視において曲線のみで構成されていてもよい。上記（３）の超電導線材接続構造によると、引張荷重が加わった際の応力集中を抑制することが可能である。 (3) In the superconducting wire connection structure of (2) above, the recesses and protrusions may be composed only of curves in a plan view. The superconducting wire connection structure of (3) above makes it possible to suppress stress concentration when a tensile load is applied.
　（４）上記（１）の超電導線材接続構造では、第１端面に、複数の第１凹部及び複数の第１凸部が設けられていてもよい。第２端面には、複数の第２凹部及び複数の第２凸部が設けられていてもよい。第１凹部は、第１超電導線材の幅方向において、隣り合う２つの第１凸部の間にあってもよい。第２凹部は、第２超電導線材の幅方向において、隣り合う２つの第２凸部の間にあってもよい。第１超電導線材は、第１凹部及び第２凸部が互いに係合するとともに第１凸部及び第２凹部が互いに係合することにより、第２超電導線材に接続されていてもよい。上記（４）の超電導線材によると、引張荷重が１点に集中することが抑制され、かつ第１端面と第２端面との界面距離が線材の幅よりも大きくなって引張荷重に対する強度を高めることが可能である。 (4) In the superconducting wire connection structure of (1) above, the first end face may be provided with a plurality of first recesses and a plurality of first protrusions. The second end face may be provided with a plurality of second recesses and a plurality of second protrusions. The first recess may be between two adjacent first protrusions in the width direction of the first superconducting wire. The second recess may be between two adjacent second protrusions in the width direction of the second superconducting wire. The first superconducting wire may be connected to the second superconducting wire by the first recess and the second protrusion engaging with each other and the first protrusion and the second recess engaging with each other. According to the superconducting wire of (4) above, the concentration of the tensile load at one point is suppressed, and the interface distance between the first end face and the second end face is larger than the width of the wire, so that the strength against the tensile load can be increased.
　（５）上記（４）の超電導線材接続構造では、第１凹部、第１凸部、第２凹部及び第２凸部は、平面視において曲線のみで構成されていてもよい。上記（５）の超電導線材接続構造によると、引張荷重が加わった際の応力集中を抑制することが可能である。 (5) In the superconducting wire connection structure of (4) above, the first recess, the first protrusion, the second recess, and the second protrusion may be composed only of curves in a plan view. According to the superconducting wire connection structure of (5) above, it is possible to suppress stress concentration when a tensile load is applied.
　（６）上記（１）から（５）の超電導線材接続構造では、第１端面が、平面視において第１超電導線材の幅方向に対して傾斜している部分を有していてもよい。第２端面は、平面視において第２超電導線材の幅方向に対して傾斜している部分を有していてもよい。上記（６）の超電導線材接続構造によると、第１端面と第２端面との係合をより強固に行うことができる。 (6) In the superconducting wire connection structures of (1) to (5) above, the first end face may have a portion that is inclined with respect to the width direction of the first superconducting wire in a plan view. The second end face may have a portion that is inclined with respect to the width direction of the second superconducting wire in a plan view. According to the superconducting wire connection structure of (6) above, the engagement between the first end face and the second end face can be made more firmly.
　（７）上記（１）から（６）の超電導線材接続構造は、第３超電導線材と接続層とをさらに備えていてもよい。第１超電導線材は、第１超電導線材の長手方向における端部であり、かつ、第１端面に隣接する第１端部を有していてもよい。第２超電導線材は、第２超電導線材の長手方向における端部であり、かつ、第２端面に隣接する第２端部を有していてもよい。第３超電導線材は、第３基材と、第３基材上に配置されている第３中間層と、第３中間層上に配置されている第３超電導層とを有していてもよい。第３超電導層は、接続層を介在させて、第１端部にある第１超電導層及び第２端部にある第２超電導層に超電導接合されていてもよい。上記（６）の超電導線材接続構造によると、第１超電導層から第３超電導層を経由して第２超電導層に大電流を流すことが可能である。 (7) The superconducting wire connection structure of (1) to (6) above may further include a third superconducting wire and a connection layer. The first superconducting wire may be an end of the first superconducting wire in the longitudinal direction and may have a first end adjacent to the first end face. The second superconducting wire may be an end of the second superconducting wire in the longitudinal direction and may have a second end adjacent to the second end face. The third superconducting wire may have a third substrate, a third intermediate layer disposed on the third substrate, and a third superconducting layer disposed on the third intermediate layer. The third superconducting layer may be superconductively joined to the first superconducting layer at the first end and the second superconducting layer at the second end via a connection layer. According to the superconducting wire connection structure of (6) above, it is possible to pass a large current from the first superconducting layer to the second superconducting layer via the third superconducting layer.
　（８）上記（７）の超電導線材接続構造では、第１超電導線材の幅方向における第１端部の両端部にある第１中間層及び第１超電導層が、除去されていてもよい。第２超電導線材の幅方向における第２端部の両端部にある第２中間層及び第２超電導層は、除去されていてもよい。第３超電導線材の幅方向における両端部にある第３中間層及び第３超電導層は、除去されていてもよい。第３超電導線材の幅方向における第３基材の両端部は、それぞれ第１超電導線材の幅方向における第１端部の両端部にある第１基材に溶接されているとともに、それぞれ第２超電導線材の幅方向における第２端部の両端部にある第２基材に溶接されていてもよい。上記（７）の超電導線材接続構造によると、引張荷重に対する強度をさらに高めることができる。 (8) In the superconducting wire connection structure of (7) above, the first intermediate layer and the first superconducting layer at both ends of the first end in the width direction of the first superconducting wire may be removed. The second intermediate layer and the second superconducting layer at both ends of the second end in the width direction of the second superconducting wire may be removed. The third intermediate layer and the third superconducting layer at both ends in the width direction of the third superconducting wire may be removed. Both ends of the third substrate in the width direction of the third superconducting wire may be welded to the first substrate at both ends of the first end in the width direction of the first superconducting wire, and may be welded to the second substrate at both ends of the second end in the width direction of the second superconducting wire. According to the superconducting wire connection structure of (7) above, the strength against tensile load can be further increased.
　（９）実施形態に係る積層構造体は、複数の超電導線材接続構造を備える。超電導線材接続構造は、第１基材、第１基材上に配置されている第１中間層及び第１中間層上に配置されている第１超電導層を有する第１超電導線材と、第２基材、第２基材上に配置されている第２中間層及び第２中間層上に配置されている第２超電導層を有する第２超電導線材とを備える。第１超電導線材は、第１超電導線材の長手方向における端面である第１端面を有する。第２超電導線材は、第２超電導線材の長手方向における端面である第２端面を有する。第１超電導線材は、第１端面及び第２端面が互いに係合することにより、第１基材、第１中間層及び第１超電導層がそれぞれ第２基材、第２中間層及び第２超電導層と互いに向かい合うように第２超電導線材に接続されている。複数の超電導線材接続構造は、重ねて配置されている。 　(9) The laminated structure according to the embodiment includes a plurality of superconducting wire connection structures. The superconducting wire connection structure includes a first superconducting wire having a first substrate, a first intermediate layer disposed on the first substrate, and a first superconducting layer disposed on the first intermediate layer, and a second superconducting wire having a second substrate, a second intermediate layer disposed on the second substrate, and a second superconducting layer disposed on the second intermediate layer. The first superconducting wire has a first end face which is an end face in the longitudinal direction of the first superconducting wire. The second superconducting wire has a second end face which is an end face in the longitudinal direction of the second superconducting wire. The first end face and the second end face of the first superconducting wire are engaged with each other, so that the first substrate, the first intermediate layer, and the first superconducting layer face each other, respectively. The plurality of superconducting wire connection structures are arranged in a stacked manner.
　［本開示の実施形態の詳細］
　本開示の実施形態の詳細を、図面を参照しながら説明する。以下の図面では、同一又は相当する部分に同一の参照符号を付し、重複する説明は繰り返さないものとする。 [Details of the embodiment of the present disclosure]
The details of the embodiments of the present disclosure will be described with reference to the drawings. In the following drawings, the same or corresponding parts are designated by the same reference numerals, and redundant description will not be repeated.
　（第１実施形態）
　第１実施形態に係る超電導線材接続構造を説明する。第１実施形態に係る超電導線材接続構造を、超電導線材接続構造１００とする。 First Embodiment
A superconducting wire connection structure according to a first embodiment will be described. The superconducting wire connection structure according to the first embodiment is referred to as a superconducting wire connection structure 100.
　＜超電導線材接続構造１００の構成＞
　以下に、図１から図３を参照して、超電導線材接続構造１００の構成を説明する。 <Configuration of superconducting wire connection structure 100>
The configuration of the superconducting wire connection structure 100 will be described below with reference to FIGS.
　図１から図３に示されているように、超電導線材接続構造１００は、第１超電導線材１０と、第２超電導線材２０と、第３超電導線材３０と、接続層４０とを有している。 As shown in Figures 1 to 3, the superconducting wire connection structure 100 has a first superconducting wire 10, a second superconducting wire 20, a third superconducting wire 30, and a connection layer 40.
　第１超電導線材１０は、第１基材１１と、第１中間層１２と、第１超電導層１３とを有している。第１基材１１は、例えば、ステンレス鋼製のテープ部材と、当該テープ部材上に配置されている銅（Ｃｕ）層と、当該銅層上に配置されているニッケル（Ｎｉ）層とを有するクラッド材である。第１基材１１は、例えばハステロイ（登録商標）製のテープ部材であってもよい。 The first superconducting wire 10 has a first substrate 11, a first intermediate layer 12, and a first superconducting layer 13. The first substrate 11 is, for example, a clad material having a tape member made of stainless steel, a copper (Cu) layer disposed on the tape member, and a nickel (Ni) layer disposed on the copper layer. The first substrate 11 may be, for example, a tape member made of Hastelloy (registered trademark).
　第１中間層１２は、第１基材１１上に配置されている。第１基材１１が上記のクラッド材である場合、第１中間層１２は、第１基材１１のニッケル層上に配置されている。第１中間層１２は、例えば、イットリア（Ｙ２Ｏ３）層と、当該イットリア層上に配置されているイットリア安定化ジルコニア（ＹＳＺ）層と、当該イットリア安定化ジルコニア層上に配置されている酸化セリウム（ＣｅＯ２）層とを有している。 The first intermediate layer 12 is disposed on the first substrate 11. When the first substrate 11 is the above-mentioned clad material, the first intermediate layer 12 is disposed on the nickel layer of the first substrate 11. The first intermediate layer 12 has, for example, an yttria (Y 2 O 3 ) layer, an yttria-stabilized zirconia (YSZ) layer disposed on the yttria layer, and a cerium oxide (CeO 2 ) layer disposed on the yttria-stabilized zirconia layer.
　第１超電導層１３は、第１中間層１２上に配置されている。第１超電導層１３の構成材料は、酸化物超電導体である。酸化物超電導体は、例えば、ＲＥＢＣＯである。ＲＥＢＣＯは、ＲＥＢａ２Ｃｕ３Ｏ７－ｙ（ＲＥは希土類元素）である。希土類元素の具体例としてはガドリニウムが挙げられるが、これに限られるものではない。 The first superconducting layer 13 is disposed on the first intermediate layer 12. The constituent material of the first superconducting layer 13 is an oxide superconductor. The oxide superconductor is, for example, REBCO. REBCO is REBa 2 Cu 3 O 7-y (RE is a rare earth element). A specific example of the rare earth element is gadolinium, but is not limited to this.
　第２超電導線材２０は、第２基材２１と、第２中間層２２と、第２超電導層２３とを有している。第２基材２１は、例えば、ステンレス鋼製のテープ部材と、当該テープ部材上に配置されている銅層と、当該銅層上に配置されているニッケル層とを有するクラッド材である。第２基材２１は、例えばハステロイ製のテープ部材であってもよい。 The second superconducting wire 20 has a second substrate 21, a second intermediate layer 22, and a second superconducting layer 23. The second substrate 21 is, for example, a clad material having a tape member made of stainless steel, a copper layer disposed on the tape member, and a nickel layer disposed on the copper layer. The second substrate 21 may be, for example, a tape member made of Hastelloy.
　第２中間層２２は、第２基材２１上に配置されている。第２基材２１が上記のクラッド材である場合、第２中間層２２は、第２基材２１のニッケル層上に配置されている。第２中間層２２は、例えば、イットリア層と、当該イットリア層上に配置されているイットリア安定化ジルコニア層と、当該イットリア安定化ジルコニア層上に配置されている酸化セリウム層とを有している。第２超電導層２３は、第２中間層２２上に配置されている。第２超電導層２３の構成材料は、酸化物超電導体である。酸化物超電導体は、例えば、ＲＥＢＣＯである。 The second intermediate layer 22 is disposed on the second substrate 21. When the second substrate 21 is the above-mentioned clad material, the second intermediate layer 22 is disposed on the nickel layer of the second substrate 21. The second intermediate layer 22 has, for example, an yttria layer, an yttria-stabilized zirconia layer disposed on the yttria layer, and a cerium oxide layer disposed on the yttria-stabilized zirconia layer. The second superconducting layer 23 is disposed on the second intermediate layer 22. The constituent material of the second superconducting layer 23 is an oxide superconductor. The oxide superconductor is, for example, REBCO.
　第１超電導線材１０は、第１超電導線材１０の長手方向において、第１端面１０ａを有している。第１超電導線材１０は、第１超電導線材１０の長手方向において、第１端部１０ｂを有している。第１端部１０ｂは、第１端面１０ａに隣接している。第２超電導線材２０は、第２超電導線材２０の長手方向において、第２端面２０ａを有している。第２超電導線材２０は、第２超電導線材２０の長手方向において第２端部２０ｂを有している。第２端部２０ｂは、第２端面２０ａに隣接している。 The first superconducting wire 10 has a first end face 10a in the longitudinal direction of the first superconducting wire 10. The first superconducting wire 10 has a first end face 10b in the longitudinal direction of the first superconducting wire 10. The first end face 10b is adjacent to the first end face 10a. The second superconducting wire 20 has a second end face 20a in the longitudinal direction of the second superconducting wire 20. The second superconducting wire 20 has a second end face 20b in the longitudinal direction of the second superconducting wire 20. The second end face 20b is adjacent to the second end face 20a.
　第１超電導線材１０の長手方向及び第２超電導線材２０の長手方向は、第１方向ＤＲ１に沿っている。第２方向ＤＲ２は、第１方向ＤＲ１に直交する方向である。このことを別の観点から言えば、第１超電導線材１０の幅方向及び第２超電導線材２０の幅方向は、第２方向ＤＲ２に沿っている。 The longitudinal direction of the first superconducting wire 10 and the longitudinal direction of the second superconducting wire 20 are aligned along the first direction DR1. The second direction DR2 is perpendicular to the first direction DR1. From another perspective, the width direction of the first superconducting wire 10 and the width direction of the second superconducting wire 20 are aligned along the second direction DR2.
　第１超電導線材１０は、第１端面１０ａが第２端面２０ａに係合されることにより、第２超電導線材２０に接続されている。ここで、第１端面１０ａが第２端面２０ａに係合されているとは、第１方向ＤＲ１に沿う荷重に対して第１端面１０ａ及び第２端面２０ａが互いに接触した状態を保つことにより、第２超電導線材２０に対する第１超電導線材１０の第１方向ＤＲ１における相対的な位置が変化しないようになっていることをいう。第１超電導線材１０が第２超電導線材２０に接続された状態で、第１基材１１、第１中間層１２及び第１超電導層１３は、それぞれ第２基材２１、第２中間層２２及び第２超電導層２３と向かい合っている。 The first superconducting wire 10 is connected to the second superconducting wire 20 by engaging the first end face 10a with the second end face 20a. Here, the first end face 10a being engaged with the second end face 20a means that the first end face 10a and the second end face 20a are kept in contact with each other against a load along the first direction DR1, so that the relative position of the first superconducting wire 10 in the first direction DR1 with respect to the second superconducting wire 20 does not change. With the first superconducting wire 10 connected to the second superconducting wire 20, the first substrate 11, the first intermediate layer 12, and the first superconducting layer 13 face the second substrate 21, the second intermediate layer 22, and the second superconducting layer 23, respectively.
　第１端面１０ａには、複数の第１凹部１０ｃが設けられている。第１凹部１０ｃは、第１超電導線材１０を、厚さ方向に沿って貫通している。より具体的には、第１凹部１０ｃは、第１基材１１、第１中間層１２及び第１超電導層１３を貫通している。第１凹部１０ｃは、第２方向ＤＲ２において、間隔を空けて並んでいる。第２方向ＤＲ２における第１凹部１０ｃの幅は、第１端面１０ａに近づくにつれて、小さくなっている。隣り合う２つの第１凹部１０ｃとの間にある第１超電導線材１０の部分が、第１凸部１０ｄになっている。そのため、第２方向ＤＲ２における第１凸部１０ｄの幅は、第１端面１０ａに近づくにつれて、大きくなっている。つまり、第２方向ＤＲ２における第１凹部１０ｃの幅は第１凹部１０ｃの底部側で最大値（図３中の幅Ｗ１１参照）になるとともに第１凹部１０ｃの開口部側で最小値（図３中の幅Ｗ１２参照）となり、第２方向ＤＲ２における第１凸部１０ｄの幅は第１凸部１０ｄの先端側で最大値（図３中の幅Ｗ２１参照）になるとともに第１凸部１０ｄの基部側で最小値（図３中の幅Ｗ２２参照）となる。 The first end face 10a has a plurality of first recesses 10c. The first recesses 10c penetrate the first superconducting wire 10 along the thickness direction. More specifically, the first recesses 10c penetrate the first substrate 11, the first intermediate layer 12, and the first superconducting layer 13. The first recesses 10c are arranged at intervals in the second direction DR2. The width of the first recesses 10c in the second direction DR2 becomes smaller as it approaches the first end face 10a. The portion of the first superconducting wire 10 between two adjacent first recesses 10c becomes the first convex portion 10d. Therefore, the width of the first convex portion 10d in the second direction DR2 becomes larger as it approaches the first end face 10a. In other words, the width of the first recess 10c in the second direction DR2 is maximum at the bottom side of the first recess 10c (see width W11 in FIG. 3) and minimum at the opening side of the first recess 10c (see width W12 in FIG. 3), and the width of the first convex portion 10d in the second direction DR2 is maximum at the tip side of the first convex portion 10d (see width W21 in FIG. 3) and minimum at the base side of the first convex portion 10d (see width W22 in FIG. 3).
　第２端面２０ａには、複数の第２凹部２０ｃが設けられている。第２凹部２０ｃは、第２超電導線材２０を、厚さ方向に沿って貫通している。より具体的には、第２凹部２０ｃは、第２基材２１、第２中間層２２及び第２超電導層２３を貫通している。第２凹部２０ｃは、第２方向ＤＲ２において、間隔を空けて並んでいる。第２方向ＤＲ２における第２凹部２０ｃの幅は、第２端面２０ａに近づくにつれて、小さくなっている。隣り合う２つの第２凹部２０ｃとの間にある第２超電導線材２０の部分が、第２凸部２０ｄになっている。そのため、第２方向ＤＲ２における第２凸部２０ｄの幅は、第２端面２０ａに近づくにつれて、大きくなっている。つまり、第２方向ＤＲ２における第２凹部２０ｃの幅は第２凹部２０ｃの底部側で最大値（図３中の幅Ｗ３１参照）になるとともに第２凹部２０ｃの開口部側で最小値（図３中の幅Ｗ３２参照）となり、第２方向ＤＲ２における第２凸部２０ｄの幅は第２凸部２０ｄの先端側で最大値（図３中の幅Ｗ４１参照）になるとともに第２凸部２０ｄの基部側で最小値（図３中の幅Ｗ４２参照）となる。 The second end face 20a has a plurality of second recesses 20c. The second recesses 20c penetrate the second superconducting wire 20 along the thickness direction. More specifically, the second recesses 20c penetrate the second substrate 21, the second intermediate layer 22, and the second superconducting layer 23. The second recesses 20c are arranged at intervals in the second direction DR2. The width of the second recesses 20c in the second direction DR2 decreases as it approaches the second end face 20a. The portion of the second superconducting wire 20 between two adjacent second recesses 20c becomes the second convex portion 20d. Therefore, the width of the second convex portion 20d in the second direction DR2 increases as it approaches the second end face 20a. In other words, the width of the second recess 20c in the second direction DR2 is maximum at the bottom side of the second recess 20c (see width W31 in FIG. 3) and minimum at the opening side of the second recess 20c (see width W32 in FIG. 3), and the width of the second convex portion 20d in the second direction DR2 is maximum at the tip side of the second convex portion 20d (see width W41 in FIG. 3) and minimum at the base side of the second convex portion 20d (see width W42 in FIG. 3).
　第１凸部１０ｄは、第２凹部２０ｃに係合される。第２凸部２０ｄは、第１凹部１０ｃに係合される。これにより、第１端面１０ａと第２端面２０ａとが係合されて第１超電導線材１０が第２超電導線材２０に接続されることになる。 The first convex portion 10d engages with the second concave portion 20c. The second convex portion 20d engages with the first concave portion 10c. As a result, the first end face 10a and the second end face 20a engage with each other, and the first superconducting wire 10 is connected to the second superconducting wire 20.
　なお、上記のとおり、第２方向ＤＲ２における第１凹部１０ｃの幅が第１凹部１０ｃの底から離れるにつれて小さくなっているとともに第２方向ＤＲ２における第２凸部２０ｄの幅が第２凸部２０ｄの先端に近づくにつれて大きくなっているため、第１方向ＤＲ１に沿った引張荷重が超電導線材接続構造１００に加わっても、第２凸部２０ｄは、第１凹部１０ｃから抜けない。同様に、第２方向ＤＲ２における第１凸部１０ｄの幅が第１凸部１０ｄの先端に近づくにつれて大きくなっているとともに第２方向ＤＲ２における第２凹部２０ｃの幅が第２凹部２０ｃの底から離れるにつれて小さくなっているため、第１方向ＤＲ１に沿った引張荷重が超電導線材接続構造１００に加わっても、第１凸部１０ｄは、第２凹部２０ｃから抜けない。 As described above, the width of the first recess 10c in the second direction DR2 decreases as it moves away from the bottom of the first recess 10c, and the width of the second protrusion 20d in the second direction DR2 increases as it moves closer to the tip of the second protrusion 20d. Therefore, even if a tensile load along the first direction DR1 is applied to the superconducting wire connection structure 100, the second protrusion 20d does not come out of the first recess 10c. Similarly, the width of the first protrusion 10d in the second direction DR2 increases as it moves closer to the tip of the first protrusion 10d, and the width of the second recess 20c in the second direction DR2 decreases as it moves away from the bottom of the second recess 20c. Therefore, even if a tensile load along the first direction DR1 is applied to the superconducting wire connection structure 100, the first protrusion 10d does not come out of the second recess 20c.
　平面視における第１凹部１０ｃの形状及び第１凸部１０ｄの形状は、曲線のみにより構成されていることが好ましい。平面視における第２凹部２０ｃの形状及び第２凸部２０ｄの形状は、曲線のみにより構成されていることが好ましい。 The shape of the first recess 10c and the shape of the first protrusion 10d in plan view are preferably made up of curves only. The shape of the second recess 20c and the shape of the second protrusion 20d in plan view are preferably made up of curves only.
　第３超電導線材３０は、第３基材３１と、第３中間層３２と、第３超電導層３３とを有している。第３基材３１は、例えば、ステンレス鋼製のテープ部材と、当該テープ部材上に配置されている銅層と、当該銅層上に配置されているニッケル層とを有するクラッド材である。第３基材３１は、例えばハステロイ製のテープ部材であってもよい。 The third superconducting wire 30 has a third substrate 31, a third intermediate layer 32, and a third superconducting layer 33. The third substrate 31 is, for example, a clad material having a tape member made of stainless steel, a copper layer disposed on the tape member, and a nickel layer disposed on the copper layer. The third substrate 31 may be, for example, a tape member made of Hastelloy.
　第３中間層３２は、第３基材３１上に配置されている。第３基材３１が上記のクラッド材である場合、第３中間層３２は、第３基材３１のニッケル層上に配置されている。第３中間層３２は、例えば、イットリア層と、当該イットリア層上に配置されているイットリア安定化ジルコニア層と、当該イットリア安定化ジルコニア層上に配置されている酸化セリウム層とを有している。第３超電導層３３は、第３中間層３２上に配置されている。第３超電導層３３の構成材料は、酸化物超電導体である。酸化物超電導体は、例えば、ＲＥＢＣＯである。 The third intermediate layer 32 is disposed on the third substrate 31. When the third substrate 31 is the above-mentioned clad material, the third intermediate layer 32 is disposed on the nickel layer of the third substrate 31. The third intermediate layer 32 has, for example, an yttria layer, an yttria-stabilized zirconia layer disposed on the yttria layer, and a cerium oxide layer disposed on the yttria-stabilized zirconia layer. The third superconducting layer 33 is disposed on the third intermediate layer 32. The constituent material of the third superconducting layer 33 is an oxide superconductor. The oxide superconductor is, for example, REBCO.
　第３超電導線材３０は、第３超電導層３３が接続層４０を介在させて第１端部１０ｂにある第１超電導層１３及び第２端部２０ｂにある第２超電導層２３と対向するように配置されている。 The third superconducting wire 30 is arranged so that the third superconducting layer 33 faces the first superconducting layer 13 at the first end 10b and the second superconducting layer 23 at the second end 20b, with the connecting layer 40 interposed therebetween.
　接続層４０の構成材料は、ＲＥＢＣＯである。接続層４０を構成しているＲＥＢＣＯの結晶は、第１端部１０ｂにある第１超電導層１３を構成しているＲＥＢＣＯの結晶からエピタキシャル成長しているとともに、第２端部２０ｂにある第２超電導層２３を構成しているＲＥＢＣＯの結晶からエピタキシャル成長している。また、接続層４０を構成しているＲＥＢＣＯの結晶は、第３超電導層３３を構成しているＲＥＢＣＯの結晶からエピタキシャル成長している。そのため、第３超電導層３３は、接続層４０により、第１端部１０ｂにある第１超電導層１３及び第２端部２０ｂにある第２超電導層２３に超電導接合されている。 The material of the connection layer 40 is REBCO. The REBCO crystals constituting the connection layer 40 are epitaxially grown from the REBCO crystals constituting the first superconducting layer 13 at the first end 10b, and also from the REBCO crystals constituting the second superconducting layer 23 at the second end 20b. The REBCO crystals constituting the connection layer 40 are epitaxially grown from the REBCO crystals constituting the third superconducting layer 33. Therefore, the third superconducting layer 33 is superconductively joined to the first superconducting layer 13 at the first end 10b and the second superconducting layer 23 at the second end 20b by the connection layer 40.
　第１超電導線材１０は、さらに、第１安定化層１４を有していてもよい。第１安定化層１４は、第１超電導層１３上に配置されている。第１超電導線材１０は、第１安定化層１４上に配置されている第１保護層（図示せず）を有していてもよい。第１超電導線材１０は、第１保護層を有していなくてもよい。但し、第１端部１０ｂにある第１超電導層１３上では、第１安定化層１４及び第１保護層が除去されている。第１安定化層１４の構成材料は、例えば、銅又は銅合金である。第１保護層の構成材料は、例えば、銀又は銀合金である。 The first superconducting wire 10 may further have a first stabilization layer 14. The first stabilization layer 14 is disposed on the first superconducting layer 13. The first superconducting wire 10 may have a first protective layer (not shown) disposed on the first stabilization layer 14. The first superconducting wire 10 may not have a first protective layer. However, the first stabilization layer 14 and the first protective layer are removed on the first superconducting layer 13 at the first end 10b. The material of the first stabilization layer 14 is, for example, copper or a copper alloy. The material of the first protective layer is, for example, silver or a silver alloy.
　第２超電導線材２０は、さらに、第２安定化層２４を有していてもよい。第２安定化層２４は、第２超電導層２３上に配置されている。第２超電導線材２０は、第２安定化層２４上に配置されている第２保護層（図示せず）を有していてもよい。第２超電導線材２０は、第２保護層を有していなくてもよい。但し、第２端部２０ｂにある第２超電導層２３上では、第２安定化層２４及び第２保護層が除去されている。第２安定化層２４の構成材料は、例えば、銅又は銅合金である。第２保護層の構成材料は、例えば、銀又は銀合金である。 The second superconducting wire 20 may further have a second stabilizing layer 24. The second stabilizing layer 24 is disposed on the second superconducting layer 23. The second superconducting wire 20 may have a second protective layer (not shown) disposed on the second stabilizing layer 24. The second superconducting wire 20 may not have a second protective layer. However, the second stabilizing layer 24 and the second protective layer are removed on the second superconducting layer 23 at the second end 20b. The second stabilizing layer 24 is made of, for example, copper or a copper alloy. The second protective layer is made of, for example, silver or a silver alloy.
　＜超電導線材接続構造１００の製造方法＞
　以下に、図４を参照して、超電導線材接続構造１００の製造方法を説明する。 <Method of manufacturing superconducting wire connection structure 100>
A method for manufacturing the superconducting wire connection structure 100 will be described below with reference to FIG.
　図４に示されるように、超電導線材接続構造１００の製造方法は、準備工程Ｓ１と、端面加工工程Ｓ２と、微結晶層形成工程Ｓ３と、端面係合工程Ｓ４と、超電導接合工程Ｓ５と、酸素再導入工程Ｓ６とを有している。 As shown in FIG. 4, the method for manufacturing the superconducting wire connection structure 100 includes a preparation step S1, an end face processing step S2, a microcrystalline layer formation step S3, an end face engagement step S4, a superconducting joining step S5, and an oxygen reintroduction step S6.
　準備工程Ｓ１では、第１超電導線材１０、第２超電導線材２０及び第３超電導線材３０が準備される。準備工程Ｓ１の後には、端面加工工程Ｓ２及び微結晶層形成工程Ｓ３が行われる。 In the preparation step S1, the first superconducting wire 10, the second superconducting wire 20, and the third superconducting wire 30 are prepared. After the preparation step S1, the end face processing step S2 and the microcrystalline layer forming step S3 are performed.
　端面加工工程Ｓ２では、第１端面１０ａに第１凹部１０ｃ及び第１凸部１０ｄが形成される。第１凹部１０ｃ及び第１凸部１０ｄは、第１端面１０ａの近傍にレーザを照射して第１超電導線材１０を部分的に除去することで形成される。端面加工工程Ｓ２では、第２端面２０ａに第２凹部２０ｃ及び第２凸部２０ｄが形成される。第２凹部２０ｃ及び第２凸部２０ｄは、第１凹部１０ｃ及び第１凸部１０ｄと同様の方法により形成される。 In the end face processing step S2, a first recess 10c and a first protrusion 10d are formed on the first end face 10a. The first recess 10c and the first protrusion 10d are formed by irradiating a laser near the first end face 10a to partially remove the first superconducting wire 10. In the end face processing step S2, a second recess 20c and a second protrusion 20d are formed on the second end face 20a. The second recess 20c and the second protrusion 20d are formed by the same method as the first recess 10c and the first protrusion 10d.
　微結晶層形成工程Ｓ３では、第３超電導層３３上に、微結晶層５０（図示を省略）が形成される。微結晶層５０の形成では、第１に、例えばスピンコート法により、第３超電導層３３上に有機化合物膜が形成される。有機化合物膜は、ＲＥＢＣＯの構成元素を含有している。第２に、有機化合物膜に対する仮焼成が行われる。仮焼成により、有機化合物膜は、ＲＥＢＣＯの前駆体となる。仮焼成が行われた有機化合物膜を、仮焼膜という。第３に、仮焼成の後に、仮焼膜に対する熱処理が行われる。これにより、仮焼膜に含まれる炭化物が分解されて、ＲＥＢＣＯの微結晶を含む微結晶層５０が形成される。端面加工工程Ｓ２及び微結晶層形成工程Ｓ３が行われた後に、端面係合工程Ｓ４が行われる。 In the microcrystalline layer forming step S3, a microcrystalline layer 50 (not shown) is formed on the third superconducting layer 33. In forming the microcrystalline layer 50, first, an organic compound film is formed on the third superconducting layer 33 by, for example, spin coating. The organic compound film contains the constituent elements of REBCO. Second, the organic compound film is pre-fired. By pre-fired, the organic compound film becomes a precursor of REBCO. The organic compound film that has been pre-fired is called a pre-fired film. Third, after pre-fired, the pre-fired film is heat-treated. As a result, the carbides contained in the pre-fired film are decomposed, and a microcrystalline layer 50 containing microcrystals of REBCO is formed. After the end face processing step S2 and the microcrystalline layer forming step S3, the end face engagement step S4 is performed.
　端面係合工程Ｓ４では、第１端面１０ａと第２端面２０ａとが係合されることにより、第１超電導線材１０が第２超電導線材２０に接続される。第１端面１０ａと第２端面２０ａとの係合は、平面視において第１凹部１０ｃが第２凸部２０ｄに重なっているとともに第１凸部１０ｄが第２凹部２０ｃに重なっている状態で、第１超電導線材１０を第２超電導線材２０の厚さ方向に沿ってスライドさせることにより行われる。端面係合工程Ｓ４が行われた後に、超電導接合工程Ｓ５が行われる。 In the end face engagement process S4, the first superconducting wire 10 is connected to the second superconducting wire 20 by engaging the first end face 10a with the second end face 20a. The engagement between the first end face 10a and the second end face 20a is performed by sliding the first superconducting wire 10 along the thickness direction of the second superconducting wire 20 with the first recess 10c overlapping the second protrusion 20d and the first protrusion 10d overlapping the second recess 20c in a plan view. After the end face engagement process S4, the superconducting joining process S5 is performed.
　超電導接合工程Ｓ５では、接続層４０により、第３超電導層３３と第１端部１０ｂにある第１超電導層１３及び第２端部２０ｂにある第２超電導層２３とが超電導接合される。超電導接合工程Ｓ５では、第１に、微結晶層５０を介在させて第３超電導層３３が第１端部１０ｂにある第１超電導層１３及び第２端部２０ｂにある第２超電導層２３と対向するように、第３超電導線材３０が配置される。 In the superconducting joining process S5, the third superconducting layer 33 is superconductively joined to the first superconducting layer 13 at the first end 10b and the second superconducting layer 23 at the second end 20b by the connection layer 40. In the superconducting joining process S5, first, the third superconducting wire 30 is arranged so that the third superconducting layer 33 faces the first superconducting layer 13 at the first end 10b and the second superconducting layer 23 at the second end 20b with the microcrystalline layer 50 interposed therebetween.
　第２に、第１端部１０ｂにある第１超電導層１３、第２端部２０ｂにある第２超電導層２３、第３超電導層３３及び微結晶層５０に対する加熱・加圧が行われる。これにより、微結晶層５０に含まれるＲＥＢＣＯの微結晶が配向結晶化し（第１端部１０ｂにある第１超電導層１３、第２端部２０ｂにある第２超電導層２３及び第３超電導層３３からエピタキシャル成長し）、接続層４０となる。これにより、図１から図３に示される構造の超電導線材接続構造１００が形成される。 Secondly, the first superconducting layer 13 at the first end 10b, the second superconducting layer 23 at the second end 20b, the third superconducting layer 33, and the microcrystalline layer 50 are heated and pressurized. As a result, the REBCO microcrystals contained in the microcrystalline layer 50 are oriented and crystallized (epitaxially grown from the first superconducting layer 13 at the first end 10b, and the second superconducting layer 23 and the third superconducting layer 33 at the second end 20b) to become the connection layer 40. As a result, the superconducting wire connection structure 100 having the structure shown in Figures 1 to 3 is formed.
　超電導接合工程Ｓ５において行われた加熱により、第１端部１０ｂにある第１超電導層１３を構成しているＲＥＢＣＯ、第２端部２０ｂにある第２超電導層２３を構成しているＲＥＢＣＯ、第３超電導層３３を構成しているＲＥＢＣＯ及び接続層４０を構成しているＲＥＢＣＯから酸素が脱離してしまう。そのため、酸素再導入工程Ｓ６では、酸素を含む雰囲気下において超電導線材接続構造１００を加熱保持することにより、第１端部１０ｂにある第１超電導層１３を構成しているＲＥＢＣＯ、第２端部２０ｂにある第２超電導層２３を構成しているＲＥＢＣＯ、第３超電導層３３を構成しているＲＥＢＣＯ及び接続層４０を構成しているＲＥＢＣＯに酸素が再導入される。 The heating performed in the superconducting joining step S5 causes oxygen to be desorbed from the REBCO constituting the first superconducting layer 13 at the first end 10b, the REBCO constituting the second superconducting layer 23 at the second end 20b, the REBCO constituting the third superconducting layer 33, and the REBCO constituting the connection layer 40. Therefore, in the oxygen reintroduction step S6, the superconducting wire connection structure 100 is heated and held in an oxygen-containing atmosphere, so that oxygen is reintroduced into the REBCO constituting the first superconducting layer 13 at the first end 10b, the REBCO constituting the second superconducting layer 23 at the second end 20b, the REBCO constituting the third superconducting layer 33, and the REBCO constituting the connection layer 40.
　＜超電導線材接続構造１００の効果＞
　以下に、超電導線材接続構造１００の効果を、比較例に係る超電導線材接続構造と比較しながら説明する。比較例に係る超電導線材接続構造を、超電導線材接続構造２００とする。 <Effects of superconducting wire connection structure 100>
The effects of the superconducting wire connection structure 100 will be described below in comparison with a superconducting wire connection structure according to a comparative example. The superconducting wire connection structure according to the comparative example is referred to as a superconducting wire connection structure 200.
　図５から図７に示されるように、超電導線材接続構造２００の構成は、第１端面１０ａが第２端面２０ａに係合されておらず、第１端面１０ａが第２端面２０ａに接触しているに過ぎない点を除いて、超電導線材接続構造１００の構成と共通している。 As shown in Figures 5 to 7, the configuration of the superconducting wire connection structure 200 is the same as the configuration of the superconducting wire connection structure 100, except that the first end face 10a is not engaged with the second end face 20a, but is merely in contact with the second end face 20a.
　超電導線材接続構造２００では、第１端面１０ａと第２端面２０ａとが係合されていないため、第１超電導線材１０と第２超電導線材２０との接続は、接続層４０を介して行われているに過ぎない。そのため、第１方向ＤＲ１に沿う引張荷重に対する超電導線材接続構造２００の強度を確保するために補強が必要となる。超電導線材接続構造２００では、例えば、第１補強部材及び第２補強部材により第３超電導線材３０と第１端部１０ｂ及び第２端部２０ｂとを挟み込むとともに、第１補強部材及び第２補強部材を相互に固定する補強が必要となり、接続部が厚くなってしまう。 In the superconducting wire connection structure 200, the first end face 10a and the second end face 20a are not engaged, and therefore the first superconducting wire 10 and the second superconducting wire 20 are connected only via the connection layer 40. Therefore, reinforcement is required to ensure the strength of the superconducting wire connection structure 200 against the tensile load along the first direction DR1. In the superconducting wire connection structure 200, for example, the third superconducting wire 30 and the first end 10b and the second end 20b are sandwiched between the first reinforcing member and the second reinforcing member, and reinforcement is required to fix the first reinforcing member and the second reinforcing member to each other, which results in a thick connection portion.
　他方で、超電導線材接続構造１００では、第１端面１０ａと第２端面２０ａとが係合しているため、上記のような補強を行わなくても、第１方向ＤＲ１に沿う引張荷重に対する強度が確保されている。そのため、超電導線材接続構造１００では、引張荷重に対する強度を確保しつつ、薄型化が可能である。なお、超電導線材接続構造１００では、第１超電導層１３及び第２超電導層２３が接続層４０により第３超電導層３３に超電導接合されているため、第１超電導層１３から第３超電導層３３を経由して第２超電導層２３に大電流を流すことが可能である。 On the other hand, in the superconducting wire connection structure 100, the first end face 10a and the second end face 20a are engaged, so that the strength against the tensile load along the first direction DR1 is ensured even without the above-mentioned reinforcement. Therefore, the superconducting wire connection structure 100 can be made thin while ensuring the strength against the tensile load. In the superconducting wire connection structure 100, the first superconducting layer 13 and the second superconducting layer 23 are superconductively joined to the third superconducting layer 33 by the connection layer 40, so that a large current can be passed from the first superconducting layer 13 to the second superconducting layer 23 via the third superconducting layer 33.
　図８に示されるように、大きな電流を流すためには、複数の超電導線材接続構造１００を重ねて積層構造体３００を構成することになる。上記のように、超電導線材接続構造１００では薄型化が可能であるため、超電導線材接続構造１００を重ねて積層構造体３００を構成しても、厚さの増大を抑制することが可能である。 As shown in FIG. 8, in order to pass a large current, multiple superconducting wire connection structures 100 are stacked to form a laminated structure 300. As described above, the superconducting wire connection structures 100 can be made thin, so even if the laminated structure 300 is formed by stacking superconducting wire connection structures 100, it is possible to suppress an increase in thickness.
　超電導線材接続構造１００では、第１凸部１０ｄが第２凹部２０ｃに係合されとともに第２凸部２０ｄが第１凹部１０ｃに係合されることで、第１端面１０ａと第２端面２０ａとが係合されている。すなわち、超電導線材接続構造１００では、第１方向ＤＲ１に沿う引張荷重が、複数点で支持されており、１点に集中することが回避されている。また、超電導線材接続構造１００では、平面視において、第１凹部１０ｃの形状、第１凸部１０ｄの形状、第２凹部２０ｃの形状及び第２凸部２０ｄの形状が曲線のみで構成されているため、第１方向ＤＲ１に沿う引張荷重が加わった際の応力集中が抑制されている。さらに、超電導線材接続構造１００では、第１端面１０ａと第２端面２０ａとの間の界面距離が第１超電導線材１０の幅及び第２超電導線材２０の幅よりも大きくなる。そのため、超電導線材接続構造１００によると、第１方向ＤＲ１に沿う引張荷重に対する強度を高めることが可能となる。なお、超電導線材接続構造１００では、第１凸部１０ｄが第２凹部２０ｃに嵌め合わされるとともに第２凸部２０ｄが第１凹部１０ｃに嵌め合わされることにより第１端面１０ａと第２端面２０ａとを係合することができるため、第１端面１０ａと第２端面２０ａとの係合を容易に行うことが可能である。 In the superconducting wire connection structure 100, the first convex portion 10d is engaged with the second concave portion 20c, and the second convex portion 20d is engaged with the first concave portion 10c, thereby engaging the first end face 10a and the second end face 20a. That is, in the superconducting wire connection structure 100, the tensile load along the first direction DR1 is supported at multiple points, and is prevented from concentrating at one point. In addition, in the superconducting wire connection structure 100, the shape of the first concave portion 10c, the shape of the first convex portion 10d, the shape of the second concave portion 20c, and the shape of the second convex portion 20d are composed of only curves in a plan view, so that stress concentration is suppressed when a tensile load along the first direction DR1 is applied. Furthermore, in the superconducting wire connection structure 100, the interface distance between the first end face 10a and the second end face 20a is greater than the width of the first superconducting wire 10 and the width of the second superconducting wire 20. Therefore, according to the superconducting wire connection structure 100, it is possible to increase the strength against the tensile load along the first direction DR1. In addition, in the superconducting wire connection structure 100, the first end face 10a and the second end face 20a can be engaged by fitting the first convex portion 10d into the second concave portion 20c and the second convex portion 20d into the first concave portion 10c, so that the first end face 10a and the second end face 20a can be easily engaged.
　酸素再導入工程Ｓ６では、酸素が第１端面１０ａと第２端面２０ａとの間の境界を通って、第１端部１０ｂにある第１超電導層１３、第２端部２０ｂにある第２超電導層２３、第３超電導層３３及び接続層４０に供給される。超電導線材接続構造１００では、超電導線材接続構造２００と比較して第１端面１０ａと第２端面２０ａとの境界の面積が大きくなるため、酸素再導入工程Ｓ６において第１端部１０ｂにある第１超電導層１３、第２端部２０ｂにある第２超電導層２３、第３超電導層３３及び接続層４０に酸素を供給しやすくなる。 In the oxygen reintroduction step S6, oxygen is supplied through the boundary between the first end face 10a and the second end face 20a to the first superconducting layer 13 at the first end face 10b, the second superconducting layer 23 at the second end face 20b, the third superconducting layer 33, and the connection layer 40. In the superconducting wire connection structure 100, the area of the boundary between the first end face 10a and the second end face 20a is larger than that in the superconducting wire connection structure 200, so that in the oxygen reintroduction step S6, oxygen is more easily supplied to the first superconducting layer 13 at the first end face 10b, the second superconducting layer 23 at the second end face 20b, the third superconducting layer 33, and the connection layer 40.
　＜変形例１＞
　図９に示されているように、超電導線材接続構造１００では、複数の第１凹部１０ｃ及び複数の第１凸部１０ｄに代えて１つの凹部１０ｅが第１端面１０ａに形成されていてもよく、複数の第２凹部２０ｃ及び複数の第２凸部２０ｄに代えて１つの凸部２０ｅが第２端面２０ａに形成されていてもよい。この場合、凸部２０ｅが凹部１０ｅに係合されることにより、第１端面１０ａと第２端面２０ａとが係合される。 <Modification 1>
9, in the superconducting wire connection structure 100, one recess 10e may be formed on the first end face 10a instead of the plurality of first recesses 10c and the plurality of first protrusions 10d, and one protrusion 20e may be formed on the second end face 20a instead of the plurality of second recesses 20c and the plurality of second protrusions 20d. In this case, the first end face 10a and the second end face 20a are engaged with each other by engaging the protrusion 20e with the recess 10e.
　＜変形例２＞
　図１０に示されているように、平面視において、第１凹部１０ｃの形状、第１凸部１０ｄの形状、第２凹部２０ｃの形状及び第２凸部２０ｄの形状は、直線のみで構成されていてもよい。このことを別の観点から言えば、平面視において、第１凹部１０ｃの形状、第１凸部１０ｄの形状、第２凹部２０ｃの形状及び第２凸部２０ｄの形状は、台形状であってもよい。 <Modification 2>
10, the shape of the first recess 10c, the shape of the first protrusion 10d, the shape of the second recess 20c, and the shape of the second protrusion 20d may be composed of straight lines only. From another perspective, the shape of the first recess 10c, the shape of the first protrusion 10d, the shape of the second recess 20c, and the shape of the second protrusion 20d may be trapezoidal in plan view.
　なお、図示されていないが、平面視において、第１凹部１０ｃの形状、第１凸部１０ｄの形状、第２凹部２０ｃの形状及び第２凸部２０ｄの形状は、直線と曲線とを組み合わせて構成されていてもよい。 Although not shown, in plan view, the shape of the first recess 10c, the shape of the first protrusion 10d, the shape of the second recess 20c, and the shape of the second protrusion 20d may be configured by a combination of straight lines and curves.
　＜変形例３及び変形例４＞
　図１１に示されるように、平面視において、第１端面１０ａ及び第２端面２０ａは、第２方向ＤＲ２に対して傾斜していてもよい。図１２に示されるように、第１端面１０ａ及び第２端面２０ａは、第１角度で第２方向ＤＲ２に対して傾斜している部分と、第１角度とは異なる第２角度で第２方向ＤＲ２に対して傾斜している部分とを有していてもよい。これらの場合、第１端面１０ａの面積及び第２端面２０ａの面積が増加するため、第１端面１０ａと第２端面２０ａとがより強固に係合されることになる。 <Modification 3 and Modification 4>
As shown in Fig. 11, the first end face 10a and the second end face 20a may be inclined with respect to the second direction DR2 in a plan view. As shown in Fig. 12, the first end face 10a and the second end face 20a may have a portion inclined with respect to the second direction DR2 at a first angle and a portion inclined with respect to the second direction DR2 at a second angle different from the first angle. In these cases, the area of the first end face 10a and the area of the second end face 20a are increased, so that the first end face 10a and the second end face 20a are more firmly engaged with each other.
　（第２実施形態）
　第２実施形態に係る超電導線材接続構造を説明する。第２実施形態に係る超電導線材接続構造を、超電導線材接続構造１００Ａとする。ここでは、超電導線材接続構造１００と異なる点を主に説明し、重複する説明は繰り返さない。 Second Embodiment
A superconducting wire connection structure according to the second embodiment will be described. The superconducting wire connection structure according to the second embodiment is referred to as a superconducting wire connection structure 100A. Here, differences from the superconducting wire connection structure 100 will be mainly described, and overlapping descriptions will not be repeated.
　＜超電導線材接続構造１００Ａの構成＞
　以下に、図１３から図１５を参照し、超電導線材接続構造１００Ａの構成を説明する。 <Configuration of superconducting wire connection structure 100A>
The configuration of the superconducting wire connection structure 100A will be described below with reference to FIGS.
　図１３から図１５に示されるように、超電導線材接続構造１００Ａは、第１超電導線材１０と、第２超電導線材２０と、第３超電導線材３０と、接続層４０とを有している。超電導線材接続構造１００Ａでは、第１端面１０ａと第２端面２０ａとが係合されていることにより第１超電導線材１０が第２超電導線材２０に接続されている。これらの点に関して、超電導線材接続構造１００Ａの構成は、超電導線材接続構造１００の構成と共通している。 As shown in Figures 13 to 15, superconducting wire connection structure 100A has a first superconducting wire 10, a second superconducting wire 20, a third superconducting wire 30, and a connection layer 40. In superconducting wire connection structure 100A, first end face 10a and second end face 20a are engaged with each other, thereby connecting first superconducting wire 10 to second superconducting wire 20. In these respects, the configuration of superconducting wire connection structure 100A is common to the configuration of superconducting wire connection structure 100.
　超電導線材接続構造１００Ａでは、第２方向ＤＲ２における第１端部１０ｂの両端部にある第１中間層１２及び第１超電導層１３が除去されている。超電導線材接続構造１００Ａでは、第２方向ＤＲ２における第２端部２０ｂの両端部にある第２中間層２２及び第２超電導層２３が除去されている。超電導線材接続構造１００Ａでは、第２方向ＤＲ２における両端部にある第３中間層３２及び第３超電導層３３が除去されている。 In the superconducting wire connection structure 100A, the first intermediate layer 12 and the first superconducting layer 13 at both ends of the first end 10b in the second direction DR2 have been removed. In the superconducting wire connection structure 100A, the second intermediate layer 22 and the second superconducting layer 23 at both ends of the second end 20b in the second direction DR2 have been removed. In the superconducting wire connection structure 100A, the third intermediate layer 32 and the third superconducting layer 33 at both ends in the second direction DR2 have been removed.
　超電導線材接続構造１００Ａでは、溶接部６１により、第２方向ＤＲ２における両端部にある第３基材３１がそれぞれ第２方向ＤＲ２における第１端部１０ｂの両端部にある第１基材１１に接合されている。超電導線材接続構造１００Ａでは、溶接部６２により、第２方向ＤＲ２における両端部にある第３基材３１がそれぞれ第２方向ＤＲ２における第２端部２０ｂの両端部にある第２基材２１に接合されている。これらの点に関して、超電導線材接続構造１００Ａの構成は、超電導線材接続構造１００の構成と異なっている。 In the superconducting wire connection structure 100A, the third substrates 31 at both ends in the second direction DR2 are joined to the first substrates 11 at both ends of the first end 10b in the second direction DR2 by welds 61. In the superconducting wire connection structure 100A, the third substrates 31 at both ends in the second direction DR2 are joined to the second substrates 21 at both ends of the second end 20b in the second direction DR2 by welds 62. In these respects, the configuration of the superconducting wire connection structure 100A differs from the configuration of the superconducting wire connection structure 100.
　＜超電導線材接続構造１００Ａの製造方法＞
　以下に、図１６を参照して、超電導線材接続構造１００Ａの製造方法を説明する。 <Method of manufacturing superconducting wire connection structure 100A>
A method for manufacturing the superconducting wire connection structure 100A will be described below with reference to FIG.
　図１６に示されているように、超電導線材接続構造１００Ａの製造方法は、準備工程Ｓ１と、端面加工工程Ｓ２と、微結晶層形成工程Ｓ３と、端面係合工程Ｓ４と、超電導接合工程Ｓ５と、酸素再導入工程Ｓ６とを有している。この点に関して、超電導線材接続構造１００Ａの製造方法は、超電導線材接続構造１００の製造方法と共通している。 As shown in FIG. 16, the method for manufacturing the superconducting wire connection structure 100A includes a preparation step S1, an end face processing step S2, a microcrystalline layer forming step S3, an end face engagement step S4, a superconducting joining step S5, and an oxygen reintroduction step S6. In this respect, the method for manufacturing the superconducting wire connection structure 100A is common to the method for manufacturing the superconducting wire connection structure 100.
　超電導線材接続構造１００Ａの製造方法は、除去工程Ｓ７と、溶接工程Ｓ８とをさらに有している。除去工程Ｓ７では、第１超電導線材１０の幅方向における第１端部１０ｂの両端部にある第１中間層１２及び第１超電導層１３が除去されるとともに、第２超電導線材２０の幅方向における第２端部２０ｂの両端部にある第２中間層２２及び第２超電導層２３が除去される。除去工程Ｓ７では、さらに、第３超電導線材３０の幅方向における両端部にある第３中間層３２及び第３超電導層３３が除去される。 The manufacturing method of the superconducting wire connection structure 100A further includes a removal step S7 and a welding step S8. In the removal step S7, the first intermediate layer 12 and the first superconducting layer 13 at both ends of the first end 10b in the width direction of the first superconducting wire 10 are removed, and the second intermediate layer 22 and the second superconducting layer 23 at both ends of the second end 20b in the width direction of the second superconducting wire 20 are removed. In the removal step S7, the third intermediate layer 32 and the third superconducting layer 33 at both ends in the width direction of the third superconducting wire 30 are further removed.
　溶接工程Ｓ８は、端面係合工程Ｓ４が行われた後であって超電導接合工程Ｓ５が行われる前に行われる。溶接工程Ｓ８では、例えばスポット溶接が行われることにより、部分的に溶融された第１基材１１と第３基材３１が混合された上で凝固し、溶接部６１となる。また、溶接工程Ｓ８では、例えばスポット溶接が行われることにより、部分的に溶融された第２基材２１と第３基材３１とが混合された上で凝固し、溶接部６２となる。これらの点に関して、超電導線材接続構造１００Ａの製造方法は、超電導線材接続構造１００の製造方法と異なっている。 The welding process S8 is performed after the end face engagement process S4 and before the superconducting joining process S5. In the welding process S8, for example, spot welding is performed, so that the partially melted first substrate 11 and third substrate 31 are mixed and solidified to form a welded portion 61. In the welding process S8, for example, spot welding is performed, so that the partially melted second substrate 21 and third substrate 31 are mixed and solidified to form a welded portion 62. In these respects, the manufacturing method of the superconducting wire connection structure 100A differs from the manufacturing method of the superconducting wire connection structure 100.
　＜超電導線材接続構造１００Ａの効果＞
　以下に、超電導線材接続構造１００Ａの効果を説明する。 <Effects of superconducting wire connection structure 100A>
The effects of the superconducting wire connection structure 100A will be described below.
　超電導線材接続構造１００Ａでは、第１端面１０ａと第２端面２０ａとの係合に加えて、溶接部６１による第１基材１１と第３基材３１との接合及び溶接部６２による第２基材２１と第３基材３１との接合により第１方向ＤＲ１に沿う引張荷重が支持されるため、第１方向ＤＲ１に沿う引張荷重に対する強度がさらに確保されている。 In the superconducting wire connection structure 100A, in addition to the engagement between the first end face 10a and the second end face 20a, the tensile load along the first direction DR1 is supported by the joining of the first substrate 11 and the third substrate 31 by the weld 61 and the joining of the second substrate 21 and the third substrate 31 by the weld 62, so that strength against the tensile load along the first direction DR1 is further ensured.
　今回開示された実施形態は全ての点で例示であって、制限的なものではないと考えられるべきである。本発明の範囲は上記の実施形態ではなく請求の範囲によって示され、請求の範囲と均等の意味及び範囲内での全ての変更が含まれることが意図される。 The embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present invention is indicated by the claims rather than the above embodiments, and is intended to include all modifications within the meaning and scope of the claims.
　１００　超電導線材接続構造、１０　第１超電導線材、１０ａ　第１端面、１０ｂ　第１端部、１０ｃ　第１凹部、１０ｄ　第１凸部、１０ｅ　凹部、１１　第１基材、１２　第１中間層、１３　第１超電導層、１４　第１安定化層、２０　第２超電導線材、２０ａ　第２端面、２０ｂ　第２端部、２０ｃ　第２凹部、２０ｄ　第２凸部、２０ｅ　凸部、２１　第２基材、２２　第２中間層、２３　第２超電導層、２４　第２安定化層、３０　第３超電導線材、３１　第３基材、３２　第３中間層、３３　第３超電導層、４０　接続層、５０　微結晶層、６１，６２　溶接部、１００Ａ　超電導線材接続構造、２００　超電導線材接続構造、３００　積層構造体、ＤＲ１　第１方向、ＤＲ２　第２方向、Ｓ１　準備工程、Ｓ２　端面加工工程、Ｓ３　微結晶層形成工程、Ｓ４　端面係合工程、Ｓ５　超電導接合工程、Ｓ６　酸素再導入工程、Ｓ７　除去工程、Ｓ８　溶接工程、Ｗ１１，Ｗ１２，Ｗ２１，Ｗ２２，Ｗ３１，Ｗ３２，Ｗ４１，Ｗ４２　幅。 100 superconducting wire connection structure, 10 first superconducting wire, 10a first end face, 10b first end, 10c first recess, 10d first convex, 10e recess, 11 first substrate, 12 first intermediate layer, 13 first superconducting layer, 14 first stabilization layer, 20 second superconducting wire, 20a second end face, 20b second end, 20c second recess, 20d second convex, 20e convex, 21 second substrate, 22 second intermediate layer, 23 second superconducting layer, 24 second stabilization layer, 30 third superconducting wire, 31 third substrate material, 32 third intermediate layer, 33 third superconducting layer, 40 connection layer, 50 microcrystalline layer, 61, 62 welded portion, 100A superconducting wire connection structure, 200 superconducting wire connection structure, 300 laminated structure, DR1 first direction, DR2 second direction, S1 preparation process, S2 end face processing process, S3 microcrystalline layer formation process, S4 end face engagement process, S5 superconducting joining process, S6 oxygen reintroduction process, S7 removal process, S8 welding process, W11, W12, W21, W22, W31, W32, W41, W42 width.

Claims (9)

  1. 　第１基材、前記第１基材上に配置されている第１中間層及び前記第１中間層上に配置されている第１超電導層を有する第１超電導線材と、
    　第２基材、前記第２基材上に配置されている第２中間層及び前記第２中間層上に配置されている第２超電導層を有する第２超電導線材とを備え、
    　前記第１超電導線材は、前記第１超電導線材の長手方向における端面である第１端面を有し、
    　前記第２超電導線材は、前記第２超電導線材の長手方向における端面である第２端面を有し、
    　前記第１超電導線材は、前記第１端面及び前記第２端面が互いに係合することにより、前記第１基材、前記第１中間層及び前記第１超電導層がそれぞれ前記第２基材、前記第２中間層及び前記第２超電導層と互いに向かい合うように前記第２超電導線材に接続されている、超電導線材接続構造。     a first superconducting wire having a first substrate, a first intermediate layer disposed on the first substrate, and a first superconducting layer disposed on the first intermediate layer;
    a second superconducting wire having a second base material, a second intermediate layer disposed on the second base material, and a second superconducting layer disposed on the second intermediate layer;
    the first superconducting wire has a first end surface which is an end surface in a longitudinal direction of the first superconducting wire,
    the second superconducting wire has a second end surface which is an end surface in a longitudinal direction of the second superconducting wire,
    A superconducting wire connection structure, in which the first superconducting wire is connected to the second superconducting wire by engaging the first end face and the second end face with each other, so that the first base material, the first intermediate layer, and the first superconducting layer face each other with the second base material, the second intermediate layer, and the second superconducting layer, respectively.
  2. 　前記第１端面には、凹部が設けられており、
    　前記第２端面には、凸部が設けられており、
    　前記第１超電導線材は、前記凹部及び前記凸部が互いに係合することにより、前記第２超電導線材に接続されている、請求項１に記載の超電導線材接続構造。     The first end surface is provided with a recess.
    The second end surface is provided with a protrusion,
    2. The superconducting wire connection structure according to claim 1, wherein the first superconducting wire is connected to the second superconducting wire by engaging the recess and the protrusion with each other.
  3. 　前記凹部及び前記凸部は、平面視において曲線のみで構成されている、請求項２に記載の超電導線材接続構造。 The superconducting wire connection structure according to claim 2, wherein the recess and the protrusion are composed only of curves in a plan view.
  4. 　前記第１端面には、複数の第１凹部及び複数の第１凸部が設けられており、
    　前記第２端面には、複数の第２凹部及び複数の第２凸部が設けられており、
    　前記第１凹部は、前記第１超電導線材の幅方向において、隣り合う２つの前記第１凸部の間にあり、
    　前記第２凹部は、前記第２超電導線材の幅方向において、隣り合う２つの前記第２凸部の間にあり、
    　前記第１超電導線材は、前記第１凹部及び前記第２凸部が互いに係合するとともに前記第１凸部及び前記第２凹部が互いに係合することにより、前記第２超電導線材に接続されている、請求項１に記載の超電導線材接続構造。     The first end surface is provided with a plurality of first recesses and a plurality of first protrusions,
    The second end surface is provided with a plurality of second recesses and a plurality of second protrusions,
    the first recess is located between two adjacent first protrusions in a width direction of the first superconducting wire,
    the second recess is located between two adjacent second protrusions in a width direction of the second superconducting wire,
    2. The superconducting wire connection structure according to claim 1, wherein the first superconducting wire is connected to the second superconducting wire by the first recess and the second protrusion engaging with each other and the first protrusion and the second recess engaging with each other.
  5. 　前記第１凹部、前記第１凸部、前記第２凹部及び前記第２凸部は、平面視において曲線のみで構成されている、請求項４に記載の超電導線材接続構造。 The superconducting wire connection structure according to claim 4, wherein the first recess, the first protrusion, the second recess, and the second protrusion are composed only of curves in a plan view.
  6. 　前記第１端面は、平面視において前記第１超電導線材の幅方向に対して傾斜している部分を有し、
    　前記第２端面は、平面視において前記第２超電導線材の幅方向に対して傾斜している部分を有する、請求項１から請求項５のいずれか１項に記載の超電導線材接続構造。     the first end surface has a portion that is inclined with respect to a width direction of the first superconducting wire in a plan view,
    6. The superconducting wire connection structure according to claim 1, wherein the second end surface has a portion that is inclined with respect to a width direction of the second superconducting wire in a plan view.
  7. 　第３超電導線材と、
    　接続層とをさらに備え、
    　前記第１超電導線材は、前記第１超電導線材の長手方向における端部であり、かつ前記第１端面に隣接する第１端部を有し、
    　前記第２超電導線材は、前記第２超電導線材の長手方向における端部であり、かつ前記第２端面に隣接する第２端部を有し、
    　前記第３超電導線材は、第３基材と、前記第３基材上に配置されている第３中間層と、前記第３中間層上に配置されている第３超電導層とを有し、
    　前記第３超電導層は、前記接続層を介在させて、前記第１端部にある前記第１超電導層及び前記第２端部にある前記第２超電導層に超電導接合されている、請求項１から請求項６のいずれか１項に記載の超電導線材接続構造。     A third superconducting wire; and
    A connection layer is further provided,
    the first superconducting wire has a first end portion which is an end portion in a longitudinal direction of the first superconducting wire and is adjacent to the first end surface;
    the second superconducting wire has a second end portion which is an end portion of the second superconducting wire in a longitudinal direction and is adjacent to the second end surface;
    the third superconducting wire has a third base material, a third intermediate layer disposed on the third base material, and a third superconducting layer disposed on the third intermediate layer,
    7. The superconducting wire connection structure according to claim 1, wherein the third superconducting layer is superconductively joined to the first superconducting layer at the first end and the second superconducting layer at the second end, with the connection layer interposed therebetween.
  8. 　前記第１超電導線材の幅方向における前記第１端部の両端部にある前記第１中間層及び前記第１超電導層は、除去されており、
    　前記第２超電導線材の幅方向における前記第２端部の両端部にある前記第２中間層及び前記第２超電導層は、除去されており、
    　前記第３超電導線材の幅方向における両端部にある前記第３中間層及び前記第３超電導層は、除去されており、
    　前記第３超電導線材の幅方向における前記第３基材の両端部は、それぞれ前記第１超電導線材の幅方向における前記第１端部の両端部にある前記第１基材に溶接されているとともに、それぞれ前記第２超電導線材の幅方向における前記第２端部の両端部にある前記第２基材に溶接されている、請求項７に記載の超電導線材接続構造。     the first intermediate layer and the first superconducting layer at both ends of the first end in a width direction of the first superconducting wire are removed,
    the second intermediate layer and the second superconducting layer at both ends of the second end in a width direction of the second superconducting wire are removed,
    the third intermediate layer and the third superconducting layer at both ends in a width direction of the third superconducting wire are removed,
    8. The superconducting wire connection structure of claim 7, wherein both ends of the third substrate in the width direction of the third superconducting wire are welded to the first substrate at both ends of the first end in the width direction of the first superconducting wire, and are welded to the second substrate at both ends of the second end in the width direction of the second superconducting wire.
  9. 　複数の超電導線材接続構造を備え、
    　前記超電導線材接続構造は、
    　第１基材、前記第１基材上に配置されている第１中間層及び前記第１中間層上に配置されている第１超電導層を有する第１超電導線材と、
    　第２基材、前記第２基材上に配置されている第２中間層及び前記第２中間層上に配置されている第２超電導層を有する第２超電導線材とを備え、
    　前記第１超電導線材は、前記第１超電導線材の長手方向における端面である第１端面を有し、
    　前記第２超電導線材は、前記第２超電導線材の長手方向における端面である第２端面を有し、
    　前記第１超電導線材は、前記第１端面及び前記第２端面が互いに係合することにより、前記第１基材、前記第１中間層及び前記第１超電導層がそれぞれ前記第２基材、前記第２中間層及び前記第２超電導層と互いに向かい合うように前記第２超電導線材に接続されており、
    　複数の前記超電導線材接続構造は、重ねて配置されている、積層構造体。     A plurality of superconducting wire rod connection structures are provided,
    The superconducting wire connection structure includes:
    a first superconducting wire having a first substrate, a first intermediate layer disposed on the first substrate, and a first superconducting layer disposed on the first intermediate layer;
    a second superconducting wire having a second base material, a second intermediate layer disposed on the second base material, and a second superconducting layer disposed on the second intermediate layer;
    the first superconducting wire has a first end surface which is an end surface in a longitudinal direction of the first superconducting wire,
    the second superconducting wire has a second end surface which is an end surface in a longitudinal direction of the second superconducting wire,
    the first superconducting wire is connected to the second superconducting wire such that the first base material, the first intermediate layer, and the first superconducting layer face each other, respectively, by engaging the first end surface and the second end surface with each other, and
    A laminated structure, in which a plurality of the superconducting wire connection structures are arranged in a stacked manner.
PCT/JP2023/033294 2022-10-04 2023-09-13 Superconducting wire material connection structure, and layered structure WO2024075481A1 (en)

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