CN111292899B - Preparation method of composite sheathed iron-based superconducting wire - Google Patents
Preparation method of composite sheathed iron-based superconducting wire Download PDFInfo
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Abstract
The invention relates to a preparation method of a composite sheathed iron-based superconducting wire, which comprises the following steps: step 1, compounding one or more pure silver or silver alloy sheathed iron-based superconducting wires into a high-strength metal pipe; step 2, tightly attaching two ends of the superconducting wire to the inner wall of the metal pipe by using a mechanical clamp; step 3, filling metal powder into two ends of the metal pipe; step 4, filling low-hardness metal plugs at two sides of metal powder in the metal pipe; step 5, processing the assembled complex into a wire rod by adopting cold processing technologies such as rotary swaging, drawing and the like; and 6, cutting off metal plug parts at two ends of the wire rod, and sealing the two ends of the wire rod by adopting a heating melting or arc welding process. The method can effectively avoid the fracture of the end part of the wire rod caused by larger material hardness difference in the cold processing process, and avoid the element loss of the superconducting material in the subsequent heat treatment process of the wire rod.
Description
Technical Field
The invention relates to a preparation method of a composite sheathed iron-based superconducting wire.
Background
The iron-based superconducting material is a novel high-temperature superconducting material which is discovered in 1986 and is followed by a copper oxide superconductor, and comprises a plurality of different types according to the composition ratio and the crystal structure of a parent compound, wherein a 1111 system (SmFeAsO is adopted)1-xFxAs represented) and 122 system (as Ba1-xKxFe2As2And Sr1-xKxFe2As2As represented) has a high superconducting transition temperature (currently, the highest critical field is 58K and 38K respectively), the upper critical field of the iron-based superconductor can exceed 100T, and the iron-based superconductor has small anisotropy, and the intracrystalline critical current density of the single crystal exceeds 106A/cm2These excellent physical properties indicate that the iron-based superconductor has unique application advantages in the field of high field strength electricity, and thus has wide application prospects in various fields such as industry, medicine, national defense and the like [ jpn.j.appl.phys.,2012,51:010005]。
in high current applications, superconducting wire tape is required for the manufacture of superconducting cables, for the winding of superconducting magnets, and the like. Because the iron-based superconducting material has high hardness and brittleness, and cannot be directly subjected to plastic processing, the powder tube-loading method becomes a preferred technical approach for preparing the iron-based superconducting wire strip. The existing powder pipe-loading method for preparing the iron-based superconducting wire strip mainly fills superconducting powder into a metal pipe, then the superconducting powder is prepared into a wire rod and a strip through machining, and finally the connection between superconducting grains is enhanced through heat treatment and sintering. However, during the heat treatment process, other metal sheath materials except silver are easy to react with the iron-based superconducting powder, and the superconducting performance is seriously affected. Although the problem can be avoided by using pure silver or silver alloy as the sheath material, because silver is a softer metal, the mechanical strength is lower, and the requirement of practical application cannot be met, the method for filling the superconducting wire of the silver sheath into the high-strength metal sheath and then preparing the superconducting wire with the composite sheath becomes an effective method for improving the mechanical strength of the superconducting wire (patent CN201910104979.X is a high-performance iron-based superconducting strip and a preparation process thereof; patent CN201910094276.3 is a preparation method of the composite sheath iron-based superconducting wire strip, and patent CN201810619997.7 is a processing process for improving the performance of the iron-based compound superconducting strip).
On the other hand, since the iron-based superconductor contains volatile elements such as sodium, potassium, arsenic, fluorine, etc., these elements are easily lost during the heat treatment sintering process (the heat treatment temperature is usually higher than 600 degrees centigrade), thereby affecting the superconducting performance. Therefore, the two ends of the iron-based superconducting wire are sealed, so that the component loss of the iron-based superconducting wire is reduced, the wire is further densified by adopting a hot isostatic pressing sintering process, and the current carrying performance of the superconducting wire is improved. On the other hand, in the forming process of iron-based superconducting wires, which is commonly used at present, metal cylinders such as copper, iron, silver and the like are generally directly used as plugs at two ends of a metal-clad sleeve. In the drawing process, plugs with high hardness such as copper and iron are easy to be directly broken at the plug-containing part of the wire due to the work hardening effect, so that the internal iron-based superconducting core is exposed at the end face of the wire, and the end part of the wire is difficult to be sealed. If pure silver with lower hardness and higher price is adopted as the plug, the reduction of the whole production cost of the iron-based superconducting wire is not facilitated.
Disclosure of Invention
The invention aims to provide a preparation method of a composite sheathed iron-based superconducting wire, which solves the problem that a plug is easy to break in the cold drawing process and is beneficial to the sealing treatment of the end part of the subsequent wire.
The purpose of the invention is realized by the following technical scheme:
a preparation method of a composite sheathed iron-based superconducting wire comprises the following steps:
step 3, filling metal powder into two ends of the metal pipe;
step 4, filling low-hardness metal plugs at two sides of metal powder in the metal pipe;
step 5, processing the assembled complex into a wire by adopting a cold drawing process;
and 6, cutting off metal plugs at two ends of the wire rod, and sealing the two ends of the wire rod by adopting a heating melting or arc welding process.
Further, in step 1, the composition of the superconducting material in the iron-based superconducting wire cladded by pure silver or silver alloy is K, Na, P, Co-doped AFe2As2(a ═ Ba, Sr, K, Cs, Ca, Eu), or F-doped LnOFePn (Ln ═ La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Y; Pn ═ P, As), and these iron-based materials have good superconductivity.
In step 1, in order to improve the mechanical strength of the composite superconducting wire and prevent the composite sheath material from melting in the final wire heat treatment process, the metal sheath material is copper, iron, nickel, silver, manganese, titanium, niobium, tantalum, alloy with the metal elements as main components, stainless steel, low carbon steel, Monel alloy, Hastelloy alloy and Inconel alloy. The length of the metal pipe is longer than that of the iron-based superconducting wire sheathed by pure silver or silver alloy, so that the metal powder can be conveniently filled at two ends of the compounded metal pipe, and the plug can be conveniently placed.
Furthermore, in the preparation method of the composite sheathed iron-based superconducting wire, the outer diameter of the metal pipe is 5 mm to 50 cm, the wall thickness is 0.1 mm to 10 cm, and the outer diameter of the pure silver or silver alloy sheathed iron-based superconducting wire is smaller than the inner diameter of the metal pipe, so that the superconducting wire can be directly placed into the metal pipe for compounding.
In the step 3, the metal powder is one or more of copper, iron, nickel, manganese, titanium, niobium and tantalum, and binary or multi-element alloy powder prepared by using the metals can form an alloy with the metal sheath and cannot be melted in the heat treatment process of the final wire.
Further, the filling length of the metal powder in the high-strength metal pipe is 0.1 cm to 1 m.
In the step 4, the low-hardness metal plugs are made of tin, lead, zinc, cadmium, aluminum, indium and alloy taking the metals as main components, so that metal powder filled at two ends is prevented from leaking, and the work hardening effect in the subsequent processing of the wire rod is reduced, thereby avoiding the rupture of the outer sheath.
Further, the filling length of the metal plug in the high-strength metal pipe is 0.1 cm to 1 m.
And 6, heating and melting or arc welding is carried out on the part containing the metal powder, so that the metal powder and the outer sheath are melted into a whole, and the two ends of the superconducting wire are completely sealed.
The invention has the beneficial effects that:
at present, in the preparation process of an iron-based superconducting wire, a single core wire usually adopts a copper plug or a niobium plug, and a multi-core wire usually does not use a plug (see patent CN201910104979.X a high-performance iron-based superconducting strip and a preparation process thereof, and patent CN201810619997.7 a processing process for improving the performance of an iron-based compound superconducting strip), in the cold drawing process of the wire, the wire is easy to break at the inner end surface of the plug due to the high hardness of the copper plug, the niobium plug and the like, and elements in the superconducting core volatilize and leak from the two ends of the wire in the subsequent high-temperature heat treatment process of the wire, so that the chemical components of the wire are deviated. In addition, because the superconducting core is exposed at two ends of the wire after fracture, the wire superconducting core cannot be densified by adopting a hot isostatic pressing sintering process. According to the method, the metal powder with good fluidity is filled and combined with the low-hardness metal plugs to replace the common metal plugs such as iron and copper and the silver plugs with high cost, so that the cost is reduced, and the problem that the plugs are easy to break due to the work hardening of the metal plugs in the cold drawing process of the composite sheathed iron-based superconducting wire is effectively avoided, and the end part of the wire can be sealed by adopting a heating melting or arc sealing method, so that the element loss of a superconducting phase is avoided in the subsequent heat treatment sintering process, or the superconducting core in the wire can be effectively densified in the subsequent hot isostatic pressing sintering process. After the wire is subjected to sintering heat treatment, the loss amount of each element of the internal superconducting material is less than 10%, and the density of the internal superconducting material of the wire subjected to hot isostatic pressing treatment reaches more than 90% of the theoretical density.
Drawings
Fig. 1 is a schematic view of the composite assembly of the end of the composite sheathed iron-based superconducting wire according to the present invention before cold working.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the end of the composite sheathed iron-based superconducting wire is assembled before cold working, wherein 1 is a metal plug, 2 is metal powder, and 3 is a superconducting wire.
Example 1
(1) 1 piece of pure silver metal with the length of 10 cm and the outer diameter of 5 mm is taken as a sheath material and is internally containedBaFe doped with K element2As2The iron-based superconducting material wire rod is put into 1 pure copper metal tube with the length of 16 cm, the outer diameter of 8 mm and the wall thickness of 1.5 mm.
(2) And (3) tightly attaching the positions of 1 cm at two ends of the iron-based superconducting wire to the inner wall of the pure copper metal pipe by using a mechanical clamping device.
(3) Pure copper metal powder is filled into two ends of a pure copper metal tube in an argon atmosphere inert gas glove box, the filling length is 2 cm, and the filled metal powder part is close to the end face of the iron-based superconducting wire without a gap.
(4) 2 cylindrical pure tin metal plugs with the outer diameter of 5 mm and the length of 1 cm are placed at two ends of a pure copper metal pipe, so that the end faces of the inner sides of the pure tin metal plugs are tightly attached to metal powder in the metal pipe.
(5) And processing the assembled composite into a wire rod with the outer diameter of 2 mm by adopting a cold drawing processing mode, wherein the interface of the wire rod plug and the superconducting core is not broken.
(6) And completely cutting off the part of the obtained wire rod containing the pure tin metal plug, heating the parts containing the pure copper metal powder at the two ends of the wire rod in vacuum to melt the parts and the peripheral pure copper pipe wall, and cooling to seal the two ends of the wire rod.
(7) After sintering and heat treatment, the ratio of the elements of the internal superconducting material is Ba to K to Fe to As is 0.59 to 0.37 to 2 to 1.93, wherein the relative loss amounts of the elements Ba, K and As are 1.7%, 7.5% and 3.5%, respectively. The density of the superconducting material in the wire subjected to the hot isostatic pressing treatment reaches over 90% of the theoretical density.
Example 2
(1) 7 pieces of BaFe with the length of 10 cm and the external diameter of 2.55 mm and the content of K element doped pure silver metal as the sheathing material2As2The iron-based superconducting material wire rod is put into 1 copper-nickel alloy metal tube with the length of 16 cm, the outer diameter of 10 mm and the wall thickness of 1 mm.
(2) And (3) tightly attaching the 1 cm positions of two ends of the iron-based superconducting wire to the inner wall of the copper-nickel alloy metal pipe by using a mechanical clamping device.
(3) Pure copper metal powder is filled into two ends of a copper-nickel alloy metal tube in an argon atmosphere inert gas glove box, the filling length is 2 cm, and the filled metal powder part is close to the end face of an iron-based superconducting wire in the metal tube without a gap.
(4) 2 cylindrical pure tin metal plugs with the outer diameter of 8 millimeters and the length of 1 centimeter are placed at two ends of the copper-nickel alloy metal pipe, so that the inner end faces of the pure tin metal plugs are tightly attached to metal powder in the metal pipe.
(5) And processing the assembled composite into a wire rod with the outer diameter of 1.5 mm by adopting a cold drawing processing mode, wherein the interface of the wire rod plug and the superconducting core is not broken.
(6) And completely cutting off the part of the obtained wire rod containing the pure tin metal plug, heating the parts containing the pure copper metal powder at the two ends of the wire rod in vacuum to melt the parts and the peripheral copper-nickel alloy tube wall, and cooling to seal the two ends of the wire rod.
(7) After sintering and heat treatment, the ratio of the elements of the internal superconducting material is Ba, K, Fe and As is 0.59, 0.39, 2, 1.95, wherein the relative loss amounts of the elements of Ba, K and As are 1.7%, 2.5% and 2.5%, respectively. The density of the superconducting material in the wire subjected to the hot isostatic pressing treatment reaches over 90% of the theoretical density.
Example 3
(1) 19 pieces of SrFe with the Na element doping are used as a sheath material, the length of the 19 pieces of SrFe is 16 cm, the outer diameter of the 19 pieces of SrFe is 2.50 mm, and the silver-manganese alloy is used as the sheath material2As2The iron-based superconducting material wire rod is put into 1 pure iron metal tube with the length of 20 cm, the outer diameter of 15 mm and the wall thickness of 1 mm.
(2) And (3) tightly attaching the positions of 1 cm at two ends of the iron-based superconducting wire to the inner wall of the pure iron metal pipe by using a mechanical clamping device.
(3) Pure iron metal powder is filled into two ends of a pure iron metal tube in an argon atmosphere inert gas glove box, the filling length is 2 cm, and the filled metal powder part is close to the end face of the iron-based superconducting wire without clearance.
(4) 2 cylindrical pure lead metal plugs with the outer diameter of 13 mm and the length of 2 cm are placed at two ends of the pure iron metal pipe, so that the end faces of the inner sides of the pure lead metal plugs are tightly attached to metal powder in the metal pipe.
(5) And processing the assembled composite into a wire rod with the outer diameter of 2 mm by adopting a cold drawing processing mode, wherein the interface of the wire rod plug and the superconducting core is not broken.
(6) And completely cutting off the part of the obtained wire rod containing the pure lead metal plug, heating the parts containing the pure iron metal powder at the two ends of the wire rod in vacuum to melt the parts and the peripheral pure iron pipe wall, and cooling to seal the two ends of the wire rod.
(7) After sintering and heat treatment, the ratio of the element components of the internal superconducting material is Sr, K, Fe and As is 0.58, 0.37, 2, 1.91, wherein the relative loss amounts of the Sr, K and As elements are 3.3%, 7.5% and 4.5%, respectively. The density of the superconducting material in the wire subjected to the hot isostatic pressing treatment reaches over 90% of the theoretical density.
Example 4
(1) 37 pieces of BaFe with the length of 16 cm and the outer diameter of 2.72 mm and containing Na element doped in the silver-tin alloy are used as the wrapping material2As2The iron-based superconducting material wire is put into 1 silver-manganese alloy metal tube with the length of 20 cm, the outer diameter of 24 mm and the wall thickness of 2 mm.
(2) And (3) tightly attaching the 1 cm positions of two ends of the iron-based superconducting wire to the inner wall of the silver-manganese alloy metal tube by using a mechanical clamping device.
(3) Pure nickel metal powder is filled into two ends of a silver-manganese alloy metal tube in an argon atmosphere inert gas glove box, the filling length is 2 cm, and the filled metal powder part is close to the end face of an iron-based superconducting wire in the silver-manganese alloy metal tube without a gap.
(4) 2 cylindrical pure zinc metal plugs with the outer diameter of 20 mm and the length of 2 cm are placed at two ends of the silver-manganese alloy metal pipe, so that the inner end face of each plug is tightly attached to metal powder in the metal pipe.
(5) And processing the assembled composite into a wire rod with the outer diameter of 2 mm by adopting a cold drawing processing mode, wherein the interface of the wire rod plug and the superconducting core is not broken.
(6) And completely cutting off the part of the obtained wire rod containing the pure zinc metal plug, heating the parts of the two ends of the wire rod containing the pure nickel metal powder in vacuum to melt the parts of the two ends of the wire rod and the peripheral silver-manganese alloy tube wall, and cooling to seal the two ends of the wire rod.
(7) After sintering and heat treatment, the ratio of the elements of the internal superconducting material is Ba, Na, Fe and As is 0.59, 0.39, 2, 1.94, wherein the relative loss amounts of the elements of Ba, Na and As are 1.7%, 2.5% and 3.0% respectively. The density of the superconducting material in the wire subjected to the hot isostatic pressing treatment reaches over 90% of the theoretical density.
Example 5
(1) 37 pieces of BaFe with the length of 16 cm and the outer diameter of 2.72 mm are used as a wrapping material and the wrapping material contains K element doped BaFe2As2The iron-based superconducting material wire of (1) was packed in 1 stainless steel tube having a length of 20 cm, an outer diameter of 24 mm and a wall thickness of 2 mm.
(2) And (3) tightly attaching the 1 cm positions of two ends of the iron-based superconducting wire to the inner wall of the stainless steel metal tube by using a mechanical clamping device.
(3) Pure iron metal powder is filled into two ends of a stainless steel metal tube in an argon atmosphere inert gas glove box, the filling length is 2 cm, and the filled metal powder part is close to the end face of an iron-based superconducting wire without a gap.
(4) 2 cylindrical pure aluminum metal plugs with the outer diameter of 20 millimeters and the length of 2 centimeters are placed at two ends of the stainless steel metal pipe, so that the inner end face of each plug is tightly attached to metal powder in the metal pipe.
(5) And processing the assembled composite into a wire rod with the outer diameter of 2 mm by adopting a cold drawing processing mode, wherein the interface of the wire rod plug and the superconducting core is not broken.
(6) And completely cutting off the part of the obtained wire containing the pure aluminum metal plug, heating the parts of the two ends of the wire containing the pure iron metal powder in vacuum to melt the parts of the two ends of the wire and the peripheral stainless steel pipe wall, and cooling to seal the two ends of the wire.
(7) After sintering and heat treatment, the ratio of the elements of the internal superconducting material is Ba, K, Fe and As is 0.59, 0.37, 2, 1.96, wherein the relative loss amounts of the elements Ba, K and As are 1.7%, 7.5% and 2.0% respectively. The density of the superconducting material in the wire subjected to the hot isostatic pressing treatment reaches over 90% of the theoretical density.
Example 6
(1) 37 pieces of SrFe with the length of 16 cm and the outer diameter of 2.72 mm are used as a wrapping material, and the wrapping material contains K-doped SrFe2As2The iron-based superconducting material wire rod is put into 1 Monel alloy metal tube with the length of 20 cm, the outer diameter of 24 mm and the wall thickness of 2 mm.
(2) And (3) tightly attaching the positions of 1 cm at two ends of the iron-based superconducting wire to the inner wall of the Monel alloy metal pipe by using a mechanical clamping device.
(3) Pure nickel metal powder is filled into two ends of a Monel alloy metal tube in an argon atmosphere inert gas glove box, the filling length is 2 cm, and the filled metal powder part is close to the end surface of the iron-based superconducting wire without a gap.
(4) 2 cylindrical pure indium metal plugs with the outer diameter of 20 mm and the length of 2 cm are placed at two ends of the Monel alloy metal pipe, so that the inner end face of each plug is tightly attached to the metal powder in the metal pipe.
(5) And processing the assembled composite into a wire rod with the outer diameter of 2 mm by adopting a cold drawing processing mode, wherein the interface of the wire rod plug and the superconducting core is not broken.
(6) And completely cutting off the part of the obtained wire containing the pure indium metal plug, heating the parts of the two ends of the wire containing the pure nickel metal powder in vacuum to melt the parts of the wire and the peripheral Monel alloy pipe wall, and cooling to seal the two ends of the wire.
(7) After sintering and heat treatment, the ratio of the elements of the internal superconducting material is Sr, K, Fe and As is 0.57, 0.36, 2, 1.94, wherein the relative loss amounts of the elements Sr, K and As are 5.0%, 10.0% and 3.0% respectively. The density of the superconducting material in the wire subjected to the hot isostatic pressing treatment reaches over 90% of the theoretical density.
Example 7
(1) 1 wire rod of iron-based superconducting material, which is 10 cm long and 5 mm in outer diameter and contains F element doped SmOFeAs, and is made of pure silver metal as a sheath material is put into 1 pure copper metal tube, which is 16 cm long, 8 mm in outer diameter and 1.5 mm in wall thickness.
(2) And (3) tightly attaching the positions of 1 cm at two ends of the iron-based superconducting wire to the inner wall of the pure copper metal pipe by using a mechanical clamping device.
(3) Pure copper metal powder is filled into two ends of a pure copper metal tube in an argon atmosphere inert gas glove box, the filling length is 2 cm, and the filled metal powder part is close to the end face of the iron-based superconducting wire without a gap.
(4) 2 cylindrical pure tin metal plugs with the outer diameter of 5 mm and the length of 1 cm are placed at two ends of a pure copper metal pipe, so that the end faces of the inner sides of the pure tin metal plugs are tightly attached to metal powder in the metal pipe.
(5) And processing the assembled composite into a wire rod with the outer diameter of 2 mm by adopting a cold drawing processing mode, wherein the interface of the wire rod plug and the superconducting core is not broken.
(6) And completely cutting off the part of the obtained wire rod containing the pure tin metal plug, heating the parts containing the pure copper metal powder at the two ends of the wire rod in vacuum to melt the parts and the peripheral pure copper pipe wall, and cooling to seal the two ends of the wire rod.
(7) After sintering and heat treatment, the ratio of Sm to Fe to As to O to F is 0.98 to 1 to 0.95 to 0.82 to 0.18, wherein the relative loss amounts of Sm, As and F are 2.0%, 5.0% and 10.0%, respectively. The density of the superconducting material in the wire subjected to the hot isostatic pressing treatment reaches over 90% of the theoretical density.
Example 8
(1) 19 wires of iron-based superconducting material, which had a length of 16 cm and an outer diameter of 2.50 mm and contained NdOFeAs doped with F as a component, were wrapped in 1 Hastelloy alloy tube, which had a length of 20 cm, an outer diameter of 15 mm and a wall thickness of 1 mm, and were made of silver-tin alloy as a sheath material.
(2) And (3) tightly attaching the 1 cm positions of two ends of the iron-based superconducting wire to the inner wall of the Hastelloy alloy tube by using a mechanical clamping device.
(3) Pure titanium metal powder is filled into two ends of a Hastelloy alloy tube in an argon atmosphere inert gas glove box, the filling length is 2 cm, and the filled metal powder part is close to the end face of an iron-based superconducting wire without a gap.
(4) 2 cylindrical pure tin metal plugs with the outer diameter of 13 mm and the length of 2 cm are placed at two ends of the Hastelloy alloy pipe, so that the inner end faces of the cylindrical pure tin metal plugs are tightly attached to metal powder in the metal pipe.
(5) And processing the assembled composite into a wire rod with the outer diameter of 2 mm by adopting a cold drawing processing mode, wherein the interface of the wire rod plug and the superconducting core is not broken.
(6) Cutting off the part of the obtained wire containing the pure tin metal plug completely, heating the parts containing the pure titanium metal powder at the two ends of the wire in vacuum to melt the parts and the peripheral Hastelloy alloy pipe wall, and cooling to seal the two ends of the wire.
(7) After sintering and heat treatment, the ratio of the elements of the internal superconducting material is Nd, Fe, As, O and F is 0.99, 1, 0.98, 0.80 and 0.19, wherein the relative loss amounts of the elements Nd, As and F are respectively 1.0, 2.0 and 5.0, and the density of the superconducting material in the wire subjected to hot isostatic pressing treatment reaches more than 90 percent of the theoretical density.
Example 9
(1) 37 wires of iron-based superconducting material with the length of 16 cm and the outer diameter of 2.72 mm, which is made of Ag-Mn alloy and contains F element-doped SmOFeAs are put into 1 niobium-titanium alloy metal tube with the length of 20 cm, the outer diameter of 24 mm and the wall thickness of 2 mm.
(2) And (3) tightly attaching the 1 cm positions of two ends of the iron-based superconducting wire to the inner wall of the niobium-titanium alloy metal tube by using a mechanical clamping device.
(3) Pure copper metal powder is filled into two ends of a niobium-titanium alloy metal tube in an argon atmosphere inert gas glove box, the filling length is 2 cm, and the filled metal powder part is close to the end face of an iron-based superconducting wire in the niobium-titanium alloy metal tube without a gap.
(4) 2 cylindrical pure tin metal plugs with the outer diameter of 20 mm and the length of 2 cm are placed at two ends of the niobium-titanium alloy metal pipe, so that the inner end face of each plug is tightly attached to metal powder in the metal pipe.
(5) And processing the assembled composite into a wire rod with the outer diameter of 2 mm by adopting a cold drawing processing mode, wherein the interface of the wire rod plug and the superconducting core is not broken.
(6) And completely cutting off the part of the obtained wire rod containing the pure tin metal plug, heating the parts containing the pure copper metal powder at the two ends of the wire rod in vacuum to melt the parts and the peripheral niobium-titanium alloy tube wall, and cooling to seal the two ends of the wire rod.
(7) After sintering and heat treatment, the ratio of Sm to Fe to As to O to F is 0.96 to 1 to 0.95 to 0.83 to 0.18, wherein the relative loss amounts of Sm, As and F are respectively 4.0%, 5.0% and 10.0%, and the density of the superconducting material in the wire subjected to hot isostatic pressing treatment reaches more than 90% of the theoretical density.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A preparation method of a composite sheathed iron-based superconducting wire is characterized by comprising the following steps:
step 1, compounding one or more pure silver or silver alloy sheathed iron-based superconducting wires into a high-strength metal pipe;
step 2, tightly attaching two ends of the iron-based superconducting wire to the inner wall of the metal pipe by using a mechanical clamp;
step 3, filling metal powder into two ends of the metal pipe;
step 4, filling low-hardness metal plugs into two sides of the metal powder in the metal pipe to obtain an assembled complex;
step 5, processing the assembled complex into a wire by adopting a cold drawing process;
and 6, cutting off the low-hardness metal plugs at the two ends of the wire rod, and performing heating melting or arc welding on the part containing the metal powder to melt the metal powder and the outer sleeve into a whole, so that the two ends of the superconducting wire are completely sealed.
2. The method for preparing a composite sheathed iron-based superconducting wire according to claim 1, wherein the method comprises the following steps: in step 3, the metal powder is one or more of copper, iron, nickel, manganese, titanium, niobium or tantalum, or binary or multi-element alloy powder prepared by using the metals.
3. The method for preparing a composite sheathed iron-based superconducting wire according to claim 1, wherein the method comprises the following steps: in step 4, the material of the low-hardness metal plug is tin, lead, zinc, cadmium, aluminum, indium or an alloy with the metals as main components.
4. The method according to claim 1, wherein in step 1, the superconducting material component in the iron-based superconducting wire wrapped with pure silver or silver alloy is AFe doped with K, Na, P, and Co2As2Or F-doped LnOFePn, wherein a ═ Ba, Sr, K, Cs, Ca, Eu; ln is La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Y; pn ═ P, As.
5. The method for preparing a composite sheathed iron-based superconducting wire according to claim 1, wherein the method comprises the following steps: in step 1, the high-strength metal tube is made of copper, iron, nickel, silver, manganese, titanium, niobium, tantalum or an alloy containing the above metal elements as main components, or stainless steel, low-carbon steel, Monel alloy, Hastelloy alloy, or Inconel alloy.
6. The method according to claim 1, wherein in step 1, the length of the metal tube is longer than that of the iron-based superconducting wire sheathed with pure silver or silver alloy; the inner diameter of the metal pipe is larger than the outer diameter of the iron-based superconducting wire wrapped by pure silver or silver alloy.
7. The method for preparing a composite sheathed iron-based superconducting wire according to claim 1 or 5, wherein the method comprises the following steps: the metal tube has an outer diameter of 5 mm to 50 cm and a wall thickness of 0.1 mm to 10 cm.
8. The method for preparing a composite sheathed iron-based superconducting wire according to claim 1 or 2, characterized in that: the filling length of the metal powder in the high-strength metal pipe is 0.1 cm to 1 m.
9. The method for preparing a composite sheathed iron-based superconducting wire according to claim 1 or 3, wherein the method comprises the following steps: the filling length of the metal plug in the high-strength metal pipe is 0.1 cm to 1 m.
10. The method for preparing a composite sheathed iron-based superconducting wire according to claim 1, wherein the method comprises the following steps: in step 6, the heating melting or arc welding is performed on a portion containing the metal powder.
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