CN105048237A - Connection method for MgB2 superconductive wire rods - Google Patents

Connection method for MgB2 superconductive wire rods Download PDF

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CN105048237A
CN105048237A CN201510513921.2A CN201510513921A CN105048237A CN 105048237 A CN105048237 A CN 105048237A CN 201510513921 A CN201510513921 A CN 201510513921A CN 105048237 A CN105048237 A CN 105048237A
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mgb
superconducting wire
powder
attachment
superconducting
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CN105048237B (en
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王庆阳
闫果
杨芳
熊晓梅
刘国庆
冯建情
李成山
冯勇
张平祥
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Northwest Institute for Non Ferrous Metal Research
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Northwest Institute for Non Ferrous Metal Research
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Abstract

The invention provides a connection method for MgB2 superconductive wire rods, and the method comprises the following steps: 1, carrying out the acid dipping of a first MgB2 superconductive wire rod and a second MgB2 superconductive wire rod, and enabling to-be-connected ends to be polished into the shape of a slope; 2, enabling the to-be-connected end face of the first MgB2 superconductive wire rod to be covered with Mg-B mixed powder in a laying manner, and then enabling the to-be-connected end face of the first MgB2 superconductive wire rod to be connected with the second MgB2 superconductive wire rod in a butt joint manner; 3, enabling Nb foil to wrap the first and second MgB2 superconductive wire rods after butt joint, then enabling a Cu pipe to sleeve the Nb foil, and obtaining a to-be-pressed product; 4, carrying out the pressing of the to-be-pressed product through an oil press, and obtaining a pressed product; 5, carrying out the sintering of the pressed product, and obtaining a connected MgB2 superconductive wire rod. According to the connected MgB2 superconductive wire rod, the resistance value of a connector of the connected MgB2 superconductive wire rod is less than 1*10<-10> ohm, and the superconductive connection performance is good.

Description

A kind of MgB 2the method of attachment of superconducting wire
Technical field
The invention belongs to superconductor interconnection technique field, be specifically related to a kind of MgB 2the method of attachment of superconducting wire.
Background technology
Magnesium diboride (MgB 2) superconductivity of material is in calendar year 2001 by Japanese Scientists Late Cambrian, this material is a kind of nonmetallic compound with simple binary structure, its superconducting critical transition temperature (T c) under null field, be about 39K, be known at present there is the highest T csimple binary compound, be within the scope of liquid hydrogen temperature, i.e. the preferred material of low field superconducting magnet application in about 20K.But similar to high-temperature oxide superconducting material, MgB 2be a kind of frangible compounds being similar to ceramic character, under the External Force Acting such as bending, stretching, torsion, its superconducting transmission performance all can be caused to cause irreversible decay.React the technique of (W & R) adopt first coiling so general after, namely first will insulate afterwards but unreacted MgB 2line (band) material turns to solenoid coil or pie, and the superconducting wire wherein between different coil joins end to end, and then coil entirety is heat-treated, and becomes phase reaction to form the MgB with superconductivity by the chemistry between Mg-B 2superconducting coil.General MgB 2superconducting magnet is by multiple MgB 2coil is formed by stacking, and this just needs to make multiple MgB 2superconducting joint.
The quality of superconducting joint directly affects the performance of magnet, and may there is Weak link phenomenon when crystal grain connects between two, superconducting joint place wire usually, causes the superconducting transmission ability of joint area lower than MgB 2wire rod matrix.In magnet running, because the factors such as Joule heat cause magnet quenching even to damage magnet, so require that superconducting joint must have lower resistance.For MRI superconducting magnet system, General Requirements MgB 2the resistance of superconducting joint is less than 1 × 10 -10ohm.
So far, relevant MgB is not yet found 2the connection of superconducting wire also obtains resistance and is less than 1 × 10 -10the correlative study of the superconducting joint of ohm is seen in report.
Summary of the invention
Technical problem to be solved by this invention is, for above-mentioned the deficiencies in the prior art, to provide a kind of MgB 2the method of attachment of superconducting wire.The method in conjunction with pass compacting and powder sintering process by two MgB 2superconducting wire links together, and the compacting of its mesothyrid makes joint area bond strength higher, and follow-up sintering heat treatment process can ensure to form good MgB at joint area simultaneously 2superconducting phase, thus realize two MgB 2the superconduction jointing of superconducting wire.The method can solve the restriction that PIT technique prepares single length of wires, and then promotes MgB 2the practicalization of superconducting wire.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of MgB 2the method of attachment of superconducting wire, is characterized in that, the method comprises the following steps:
Step one, respectively to a MgB 2superconducting wire and the 2nd MgB 2superconducting wire carries out pickling processes, then by the MgB after pickling processes 2the 2nd MgB after the end to be connected of superconducting wire and pickling processes 2the end to be connected of superconducting wire is all grinding into ramped shaped;
Step 2, a MgB in step one after reconditioning 2mg-B mixed-powder is covered on the end end face upper berth to be connected of superconducting wire, then paving is covered with a MgB of Mg-B mixed-powder 2the 2nd MgB after the end to be connected of superconducting wire and reconditioning 2the end to be connected of superconducting wire docks; Described Mg-B mixed-powder is by Mg powder and amorphous B powder in molar ratio (1.0 ~ 1.1): 2 mix and form;
Step 3, Nb paper tinsel is coated on the MgB after docking in step 2 2superconducting wire and the 2nd MgB 2outside superconducting wire, then Cu pipe box is loaded on outside Nb paper tinsel, obtains product to be pressed;
Step 4, by product load hole mould to be pressed described in step 3, then the orifice type dies that product to be pressed are housed is placed in hydraulic press, after compacting, the demoulding, obtains stampings;
Step 5, stampings described in step 4 are placed in sintering furnace carry out sintering processes, naturally after cooling, obtain the MgB after connecting 2superconducting wire.
Above-mentioned a kind of MgB 2the method of attachment of superconducting wire, is characterized in that, the acid solution of pickling processes described in step one is salpeter solution, HNO in described salpeter solution 3with H 2the mol ratio of O is 1: (1.5 ~ 2).
Above-mentioned a kind of MgB 2the method of attachment of superconducting wire, is characterized in that, to a MgB in step one 2superconducting wire and the 2nd MgB 2before superconducting wire carries out pickling processes, in advance to a MgB 2the end to be connected of superconducting wire and the 2nd MgB 2the end to be connected of superconducting wire all carries out sealing with wax process to prevent acid liquid corrosion.
Above-mentioned a kind of MgB 2the method of attachment of superconducting wire, is characterized in that, the quality purity of the powder of Mg described in step 2 is not less than 99%, and the granularity of described Mg powder is not more than 44 μm.
Above-mentioned a kind of MgB 2the method of attachment of superconducting wire, is characterized in that, described in step 2, the quality purity of amorphous B powder is not less than 99%, and the granularity of described amorphous B powder is 0.3 μm ~ 0.5 μm.
Above-mentioned a kind of MgB 2the method of attachment of superconducting wire, is characterized in that, the thickness of the paper tinsel of Nb described in step 3 is 0.05mm ~ 0.2mm.
Above-mentioned a kind of MgB 2the method of attachment of superconducting wire, is characterized in that, the pressure suppressed described in step 4 is 10MPa ~ 20MPa, and the time of described compacting is 30s ~ 120s.
Above-mentioned a kind of MgB 2the method of attachment of superconducting wire, is characterized in that, the temperature of sintering processes described in step 5 is 660 DEG C ~ 680 DEG C, and the time of described sintering processes is 1h ~ 2h.
The present invention compared with prior art has the following advantages:
1, the present invention adopts pass compacting to be connected two MgB with the powder sintered technique combined 2superconducting wire, after pass compacting, in joint area, Mg-B mixed powder has higher density, the joint area bond strength of two superconducting wires simultaneously connected is higher, joint area has certain bending resistance, can ensure that wire rod bears the Lorentz force action in certain applied mechanical power effect or low temperature excitation process in actual use.
2, the present invention is by two MgB 2the joint area material of superconducting line is all polished into tiltedly broken shape, ensure that MgB to greatest extent 2the contact area of superconduction powder, in conjunction with follow-up sintering Technology for Heating Processing, can form good superconduction switching performance at joint area, prepared MgB 2the resistance of superconducting wire joint area is less than 1 × 10 -10ohm.
3, the present invention in conjunction with pass compacting and powder sintering process by two MgB 2superconducting wire links together, and pass compacting makes joint area bond strength higher, and follow-up sintering heat treatment process can ensure to form good MgB at joint area simultaneously 2superconducting phase, thus realize two MgB 2the superconduction jointing of superconducting wire.The present invention can solve the restriction that PIT technique prepares single length of wires, and then promotes MgB 2the practicalization of superconducting wire.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention's product to be pressed.
Description of reference numerals:
1-1-the one MgB 2superconducting wire; 1-2-the 2nd MgB 2superconducting wire;
2-Mg-B mixed-powder; 3-Nb paper tinsel;
4-Cu manages.
Embodiment
Embodiment 1
The present embodiment MgB 2the method of attachment of superconducting wire comprises the following steps:
Step one, first, by a MgB 2the end to be connected of superconducting wire 1-1 and the 2nd MgB 2the end to be connected of superconducting wire 1-2 all carries out process of sealing with wax, in order to prevent the MgB in wire rod 2precursor powder is by acid liquid corrosion; Then, by a MgB 2superconducting wire 1-1 and the 2nd MgB 2superconducting wire 1-2 is all placed in salpeter solution and carries out pickling processes, in order to remove outside Cu jacket layer, HNO in described salpeter solution 3with H 2the mol ratio of O is 1: 1.8; Afterwards, by the MgB after pickling processes 2the 2nd MgB after the end to be connected of superconducting wire 1-1 and pickling processes 2the end to be connected of superconducting wire 1-2 is all grinding into ramped shaped, and ramp angles (angle on horizontal plane and inclined plane) is 5 °;
Step 2, first, quality purity is not less than 99%, granularity is not more than the Mg powder of 44 μm and quality purity is not less than 99%, granularity is that the amorphous B powder of 0.3 μm ~ 0.5 μm mixes in molar ratio at 1: 2, obtain Mg-B mixed-powder 2, then, Mg-B mixed-powder 2 uniform spreading is overlayed on the MgB in step one after reconditioning 2on the end face of the end to be connected of superconducting wire 1-1, afterwards, paving is covered with a MgB of Mg-B mixed-powder 2 2mgB after the end to be connected of superconducting wire 1-1 and reconditioning 2the end to be connected of superconducting wire two 1-2 docks;
Step 3, the Nb paper tinsel 3 being 0.15mm by thickness are coated on a MgB described in step 2 2superconducting wire 1-1 and the 2nd MgB 2outside superconducting wire 1-2, then Cu pipe 4 is set in outside Nb paper tinsel 3, obtains product to be pressed (structure of described product to be pressed as shown in Figure 1);
Step 4, by product load hole mould to be pressed described in step 3, then the orifice type dies that product to be pressed are housed is placed in hydraulic press, utilizes hydraulic press to treat stampings and suppress, controlling compacting pressure is 15MPa, press time is 60s, obtains stampings after the demoulding;
Step 5, stampings described in step 4 are placed in sintering furnace carry out sintering processes, controlling sintering temperature is 660 DEG C, and sintering time is 2h, naturally obtains the MgB after connection after cooling 2superconducting wire.
MgB after the present embodiment is connected 2the joint area of superconducting wire detects, and records the MgB after the present embodiment connection 2the resistance of the joint area of superconducting wire is 8.5 × 10 -12ohm, it can thus be appreciated that, the MgB after the present embodiment connects 2superconducting wire, its joint area has good superconduction switching performance.
Embodiment 2
The present embodiment MgB 2the method of attachment of superconducting wire comprises the following steps:
Step one, first, by a MgB 2the end to be connected of superconducting wire 1-1 and the 2nd MgB 2the end to be connected of superconducting wire 1-2 all carries out process of sealing with wax, in order to prevent the MgB in wire rod 2precursor powder is by acid liquid corrosion; Then, by a MgB 2superconducting wire 1-1 and the 2nd MgB 2superconducting wire 1-2 is all placed in salpeter solution and carries out pickling processes, in order to remove outside Cu jacket layer, HNO in described salpeter solution 3with H 2the mol ratio of O is 1: 1.6; Afterwards, by the MgB after pickling processes 2the 2nd MgB after the end to be connected of superconducting wire 1-1 and pickling processes 2the end to be connected of superconducting wire 1-2 is all grinding into ramped shaped, and ramp angles (angle on horizontal plane and inclined plane) is 10 °;
Step 2, first, quality purity is not less than 99%, granularity is not more than the Mg powder of 44 μm and quality purity is not less than 99%, granularity is that the amorphous B powder of 0.3 μm ~ 0.5 μm mixes in molar ratio at 1.1: 2, obtain Mg-B mixed-powder 2, then, Mg-B mixed-powder 2 uniform spreading is overlayed on the MgB in step one after reconditioning 2on the end face of the end to be connected of superconducting wire 1-1, afterwards, paving is covered with a MgB of Mg-B mixed-powder 2 2mgB after the end to be connected of superconducting wire 1-1 and reconditioning 2the end to be connected of superconducting wire two 1-2 docks;
Step 3, the Nb paper tinsel 3 being 0.15mm by thickness are coated on a MgB described in step 2 2superconducting wire 1-1 and the 2nd MgB 2outside superconducting wire 1-2, then Cu pipe 4 is set in outside Nb paper tinsel 3, obtains product to be pressed (structure of described product to be pressed as shown in Figure 1);
Step 4, by product load hole mould to be pressed described in step 3, then the orifice type dies that product to be pressed are housed is placed in hydraulic press, utilizes hydraulic press to treat stampings and suppress, controlling compacting pressure is 10MPa, press time is 120s, obtains stampings after the demoulding;
Step 5, stampings described in step 4 are placed in sintering furnace carry out sintering processes, controlling sintering temperature is 670 DEG C, and sintering time is 1.5h, naturally obtains the MgB after connection after cooling 2superconducting wire.
MgB after the present embodiment is connected 2the joint area of superconducting wire detects, and records the MgB after the present embodiment connection 2the resistance of the joint area of superconducting wire is 1.2 × 10 -11ohm, it can thus be appreciated that, the MgB after the present embodiment connects 2superconducting wire, its joint area has good superconduction switching performance.
Embodiment 3
The present embodiment MgB 2the method of attachment of superconducting wire comprises the following steps:
Step one, first, by a MgB 2the end to be connected of superconducting wire 1-1 and the 2nd MgB 2the end to be connected of superconducting wire 1-2 all carries out process of sealing with wax, in order to prevent the MgB in wire rod 2precursor powder is by acid liquid corrosion; Then, by a MgB 2superconducting wire 1-1 and the 2nd MgB 2superconducting wire 1-2 is all placed in salpeter solution and carries out pickling processes, in order to remove outside Cu jacket layer, HNO in described salpeter solution 3with H 2the mol ratio of O is 1: 2; Afterwards, by the MgB after pickling processes 2the 2nd MgB after the end to be connected of superconducting wire 1-1 and pickling processes 2the end to be connected of superconducting wire 1-2 is all grinding into ramped shaped, and ramp angles (angle on horizontal plane and inclined plane) is 15 °;
Step 2, first, quality purity is not less than 99%, granularity is not more than the Mg powder of 44 μm and quality purity is not less than 99%, granularity is that the amorphous B powder of 0.3 μm ~ 0.5 μm mixes in molar ratio at 1.1: 2, obtain Mg-B mixed-powder 2, then, Mg-B mixed-powder 2 uniform spreading is overlayed on the MgB in step one after reconditioning 2on the end face of the end to be connected of superconducting wire 1-1, afterwards, paving is covered with a MgB of Mg-B mixed-powder 2 2mgB after the end to be connected of superconducting wire 1-1 and reconditioning 2the end to be connected of superconducting wire two 1-2 docks;
Step 3, the Nb paper tinsel 3 being 0.1mm by thickness are coated on a MgB described in step 2 2superconducting wire 1-1 and the 2nd MgB 2outside superconducting wire 1-2, then Cu pipe 4 is set in outside Nb paper tinsel 3, obtains product to be pressed (structure of described product to be pressed as shown in Figure 1);
Step 4, by product load hole mould to be pressed described in step 3, then the orifice type dies that product to be pressed are housed is placed in hydraulic press, utilizes hydraulic press to treat stampings and suppress, controlling compacting pressure is 20MPa, press time is 30s, obtains stampings after the demoulding;
Step 5, stampings described in step 4 are placed in sintering furnace carry out sintering processes, controlling sintering temperature is 670 DEG C, and sintering time is 1.5h, naturally obtains the MgB after connection after cooling 2superconducting wire.
MgB after the present embodiment is connected 2the joint area of superconducting wire detects, and records the MgB after the present embodiment connection 2the resistance of the joint area of superconducting wire is 1.5 × 10 -11ohm, it can thus be appreciated that, the MgB after the present embodiment connects 2superconducting wire, its joint area has good superconduction switching performance.
Embodiment 4
The present embodiment MgB 2the method of attachment of superconducting wire comprises the following steps:
Step one, first, by a MgB 2the end to be connected of superconducting wire 1-1 and the 2nd MgB 2the end to be connected of superconducting wire 1-2 all carries out process of sealing with wax, in order to prevent the MgB in wire rod 2precursor powder is by acid liquid corrosion; Then, by a MgB 2superconducting wire 1-1 and the 2nd MgB 2superconducting wire 1-2 is all placed in salpeter solution and carries out pickling processes, in order to remove outside Cu jacket layer, HNO in described salpeter solution 3with H 2the mol ratio of O is 1: 1.5; Afterwards, by the MgB after pickling processes 2the 2nd MgB after the end to be connected of superconducting wire 1-1 and pickling processes 2the end to be connected of superconducting wire 1-2 is all grinding into ramped shaped, and ramp angles (angle on horizontal plane and inclined plane) is 30 °;
Step 2, first, quality purity is not less than 99%, granularity is not more than the Mg powder of 44 μm and quality purity is not less than 99%, granularity is that the amorphous B powder of 0.3 μm ~ 0.5 μm mixes in molar ratio at 1: 2, obtain Mg-B mixed-powder 2, then, Mg-B mixed-powder 2 uniform spreading is overlayed on the MgB in step one after reconditioning 2on the end face of the end to be connected of superconducting wire 1-1, afterwards, paving is covered with a MgB of Mg-B mixed-powder 2 2mgB after the end to be connected of superconducting wire 1-1 and reconditioning 2the end to be connected of superconducting wire two 1-2 docks;
Step 3, the Nb paper tinsel 3 being 0.05mm by thickness are coated on a MgB described in step 2 2superconducting wire 1-1 and the 2nd MgB 2outside superconducting wire 1-2, then Cu pipe 4 is set in outside Nb paper tinsel 3, obtains product to be pressed (structure of described product to be pressed as shown in Figure 1);
Step 4, by product load hole mould to be pressed described in step 3, then the orifice type dies that product to be pressed are housed is placed in hydraulic press, utilizes hydraulic press to treat stampings and suppress, controlling compacting pressure is 20MPa, press time is 30s, obtains stampings after the demoulding;
Step 5, stampings described in step 4 are placed in sintering furnace carry out sintering processes, controlling sintering temperature is 670 DEG C, and sintering time is 1.5h, naturally obtains the MgB after connection after cooling 2superconducting wire.
MgB after the present embodiment is connected 2the joint area of superconducting wire detects, and records the MgB after the present embodiment connection 2the resistance of the joint area of superconducting wire is 1.8 × 10 -11ohm, it can thus be appreciated that, the MgB after the present embodiment connects 2superconducting wire, its joint area has good superconduction switching performance.
Embodiment 5
The present embodiment MgB 2the method of attachment of superconducting wire comprises the following steps:
Step one, first, by a MgB 2the end to be connected of superconducting wire 1-1 and the 2nd MgB 2the end to be connected of superconducting wire 1-2 all carries out process of sealing with wax, in order to prevent the MgB in wire rod 2precursor powder is by acid liquid corrosion; Then, by a MgB 2superconducting wire 1-1 and the 2nd MgB 2superconducting wire 1-2 is all placed in salpeter solution and carries out pickling processes, in order to remove outside Cu jacket layer, HNO in described salpeter solution 3with H 2the mol ratio of O is 1: 1.5; Afterwards, by the MgB after pickling processes 2the 2nd MgB after the end to be connected of superconducting wire 1-1 and pickling processes 2the end to be connected of superconducting wire 1-2 is all grinding into ramped shaped, and ramp angles (angle on horizontal plane and inclined plane) is 25 °;
Step 2, first, quality purity is not less than 99%, granularity is not more than the Mg powder of 44 μm and quality purity is not less than 99%, granularity is that the amorphous B powder of 0.3 μm ~ 0.5 μm mixes in molar ratio at 1.1: 2, obtain Mg-B mixed-powder 2, then, Mg-B mixed-powder 2 uniform spreading is overlayed on the MgB in step one after reconditioning 2on the end face of the end to be connected of superconducting wire 1-1, afterwards, paving is covered with a MgB of Mg-B mixed-powder 2 2mgB after the end to be connected of superconducting wire 1-1 and reconditioning 2the end to be connected of superconducting wire two 1-2 docks;
Step 3, the Nb paper tinsel 3 being 0.05mm by thickness are coated on a MgB described in step 2 2superconducting wire 1-1 and the 2nd MgB 2outside superconducting wire 1-2, then Cu pipe 4 is set in outside Nb paper tinsel 3, obtains product to be pressed (structure of described product to be pressed as shown in Figure 1);
Step 4, by product load hole mould to be pressed described in step 3, then the orifice type dies that product to be pressed are housed is placed in hydraulic press, utilizes hydraulic press to treat stampings and suppress, controlling compacting pressure is 10MPa, press time is 120s, obtains stampings after the demoulding;
Step 5, stampings described in step 4 are placed in sintering furnace carry out sintering processes, controlling sintering temperature is 680 DEG C, and sintering time is 1h, naturally obtains the MgB after connection after cooling 2superconducting wire.
MgB after the present embodiment is connected 2the joint area of superconducting wire detects, and records the MgB after the present embodiment connection 2the resistance of the joint area of superconducting wire is 2.3 × 10 -11ohm, it can thus be appreciated that, the MgB after the present embodiment connects 2superconducting wire, its joint area has good superconduction switching performance.
The above is only preferred embodiment of the present invention, not imposes any restrictions the present invention.Every above embodiment is done according to invention technical spirit any simple modification, change and equivalence change, all still belong in the protection range of technical solution of the present invention.

Claims (8)

1. a MgB 2the method of attachment of superconducting wire, is characterized in that, the method comprises the following steps:
Step one, respectively to a MgB 2superconducting wire (1-1) and the 2nd MgB 2superconducting wire (1-2) carries out pickling processes, then by the MgB after pickling processes 2the 2nd MgB after the end to be connected of superconducting wire (1-1) and pickling processes 2the end to be connected of superconducting wire (1-2) is all grinding into ramped shaped;
Step 2, a MgB in step one after reconditioning 2mg-B mixed-powder (2) is covered on the end end face upper berth to be connected of superconducting wire (1-1), then paving is covered with a MgB of Mg-B mixed-powder (2) 2the 2nd MgB after the end to be connected of superconducting wire (1-1) and reconditioning 2the end to be connected of superconducting wire (1-2) docks; Described Mg-B mixed-powder (2) is by Mg powder and amorphous B powder in molar ratio (1.0 ~ 1.1): 2 mix and form;
Step 3, Nb paper tinsel (3) is coated on the MgB after docking in step 2 2superconducting wire (1-1) and the 2nd MgB 2cu pipe (4) outward, is then set in described Nb paper tinsel (3) outward, obtains product to be pressed by superconducting wire (1-2);
Step 4, by product load hole mould to be pressed described in step 3, then the orifice type dies that product to be pressed are housed is placed in hydraulic press, after compacting, the demoulding, obtains stampings;
Step 5, stampings described in step 4 are placed in sintering furnace carry out sintering processes, naturally after cooling, obtain the MgB after connecting 2superconducting wire.
2. a kind of MgB according to claim 1 2the method of attachment of superconducting wire, is characterized in that, the acid solution of pickling processes described in step one is salpeter solution, HNO in described salpeter solution 3with H 2the mol ratio of O is 1: (1.5 ~ 2).
3. a kind of MgB according to claim 1 2the method of attachment of superconducting wire, is characterized in that, to a MgB in step one 2superconducting wire (1-1) and the 2nd MgB 2before superconducting wire (1-2) carries out pickling processes, in advance to a MgB 2the end to be connected of superconducting wire (1-1) and the 2nd MgB 2the end to be connected of superconducting wire (1-2) all carries out sealing with wax process to prevent acid liquid corrosion.
4. a kind of MgB according to claim 1 2the method of attachment of superconducting wire, is characterized in that, the quality purity of the powder of Mg described in step 2 is not less than 99%, and the granularity of described Mg powder is not more than 44 μm.
5. a kind of MgB according to claim 1 2the method of attachment of superconducting wire, is characterized in that, described in step 2, the quality purity of amorphous B powder is not less than 99%, and the granularity of described amorphous B powder is 0.3 μm ~ 0.5 μm.
6. a kind of MgB according to claim 1 2the method of attachment of superconducting wire, is characterized in that, the thickness of the paper tinsel of Nb described in step 3 (3) is 0.05mm ~ 0.2mm.
7. a kind of MgB according to claim 1 2the method of attachment of superconducting wire, is characterized in that, the pressure suppressed described in step 4 is 10MPa ~ 20MPa, and the time of described compacting is 30s ~ 120s.
8. a kind of MgB according to claim 1 2the method of attachment of superconducting wire, is characterized in that, the temperature of sintering processes described in step 5 is 660 DEG C ~ 680 DEG C, and the time of described sintering processes is 1h ~ 2h.
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CN105355357A (en) * 2015-11-17 2016-02-24 中国科学院电工研究所 Iron-based compound superconducting joint and preparation method thereof
CN107863613A (en) * 2017-09-29 2018-03-30 中国科学院电工研究所 A kind of superconducting joint and preparation method thereof
WO2020253085A1 (en) * 2019-06-19 2020-12-24 东部超导科技（苏州）有限公司 Connection method for ybco superconducting material-based superconducting cable
CN113036470A (en) * 2021-03-17 2021-06-25 西部超导材料科技股份有限公司 MgB2Superconducting cable joint and method for producing and connecting same
CN113471723A (en) * 2021-06-28 2021-10-01 国网上海市电力公司 Joint structure of superconducting square thin wire and manufacturing method thereof
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