CN102593686B - Nb3Sn superconductor multi-core cable joint adopting bronze process and preparation method of Nb3Sn superconductor multi-core cable joint - Google Patents

Nb3Sn superconductor multi-core cable joint adopting bronze process and preparation method of Nb3Sn superconductor multi-core cable joint Download PDF

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CN102593686B
CN102593686B CN 201210046550 CN201210046550A CN102593686B CN 102593686 B CN102593686 B CN 102593686B CN 201210046550 CN201210046550 CN 201210046550 CN 201210046550 A CN201210046550 A CN 201210046550A CN 102593686 B CN102593686 B CN 102593686B
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silk
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CN102593686A (en
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程军胜
王秋良
戴银明
王晖
宋守森
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Institute of Electrical Engineering of CAS
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Abstract

The invention relates to a preparation method of an Nb3Sn superconductor multi-core cable joint adopting bronze process. The preparation method comprises the following steps of: corroding a bronze matrix at the end of the Nb3Sn superconductor multi-core cable joint to make dispersed stable cores and Nb wires exposed; mixing and connecting the Nb wires to be connected of the different superconductor multi-core cables in an overlapping way, and binding and fixing the Nb wires with a Cu wire; generating a Cu-Sn alloy plating layer on the surfaces of the Nb wires of the Nb3Sn superconductor multi-core cable joint with a sedimentation method; sheathing a Nb pipe and a Cu pipe outside the joint from the inside out, pressing the joint to make the Nb wires deposited with the Cu-Sn alloy plating layer be tightly embedded in the Nb pipe and the Cu pipe; fixedly installing the joint at the appointed position of a coil after the outer layer of the joint is sheathed with high temperature resistinginsulation materials; and carrying out heat treatment to the joint, and generating an Nb3Sn superconductive bridging layer at the Nb3Sn superconductor multi-core cable joint through solid diffusion so as to realize the superconductive connection of the joint. The Nb3Sn superconductor multi-core cable joint prepared by the preparation method has low resistance and low loss at the superconducting temperature.

Description

A kind of Bronze Process Nb 3Sn superconductor multi-core wire connector and preparation method thereof
The application is that denomination of invention is " a kind of Bronze Process Nb 3Sn superconductor multi-core wire connector and preparation method thereof " (application number: 201010221920.8, the applying date: on June 30th, 2010) application for a patent for invention divides an application.
Technical field
The present invention relates to a kind of Bronze Process Nb 3Sn superconductor multi-core wire connector and preparation method thereof.
Background technology
Nb 3The Sn material demonstrates good superconduct characteristic under the 18K cryogenic conditions.Its critical transition temperature is higher than the NbTi superconductor material, is particularly suitable for the construction of highfield superconducting magnet.
Different according to wire rod structure, preparation Nb 3The method of Sn superconducting line mainly is divided into two kinds of Bronze Process and Nei Xifa.The wire rod of Bronze Process is bronze-Nb silk multicore machinery composite construction.The Nei Xifa wire rod is the mechanical composite construction of many Cu/Nb multiple tube interpolation Sn silk.Above two kinds of wire rods all need to be heat-treated under proper temperature, generate the Nb that possesses superconductivity by solid-state diffusion 3The Sn compound layer has superconductivity.Bronze Process Nb 3Sn superconductor split conductor is used widely owing to using stable, technology maturation.Bronze Process Nb 3Sn superconductor split conductor before heat treatment (bronze-Nb silk multicore machinery recombination line) the cross-sectional structure schematic diagram as shown in Figure 1, comprising: stablize core, Nb silk, bronze matrix.
Nb 3Sn is the A15 structural compounds, itself has larger fragility, and any distortion or collision all may be to the superconductivity injuries.Therefore in Practical Project, utilize Bronze Process to prepare Nb 3In the process of Sn superconducting coil, need at first bronze-Nb silk multicore machinery recombination line to be turned to the coil that meets designing requirement, then coil integral body is heat-treated, in multicore machinery recombination line, generate the Nb that possesses superconductivity by the solid-state diffusion reaction 3Sn compound, thereby the Nb that obtains having superconductivity 3The Sn superconducting coil.Can not change again after the reaction superconducting line around to, avoid occuring Nb 3The brittle failure of Sn superconducting line or damage, the injury superconductivity.
In the building course of superconducting magnet coil, the welding of superconducting line is one of key technology.The length of single superconducting line is limited, and large scale superconducting magnet of coiling often needs tens superconducting lines to the hundreds of km, many superconducting lines must be welded in this case to guarantee required length.Simultaneously, when making the superconducting magnet of multi-coil composition, the connection between the coil need to be finished by the welding of end winding wire.Similarly, make when forming the ground superconducting magnet system by a plurality of superconducting magnets, powered by single power supply if require each magnet is together in series, also need the welding of connecting from beginning to end of each magnet ends.Compare with the mode that each magnet is powered separately, single supply power mode can make magnet system possess higher functional reliability.In addition, if superconducting magnet is wanted operation with closed ring, also need the two ends of magnet or magnet system and superconducting switch coupled together to form the closed-loop path.
In large scale superconducting magnet was built, coiling and the connection between the superconducting line of superconducting line were carried out simultaneously.The processing quality that joint is made directly has influence on the progress of engineering.In addition, many joints of large-scale magnet are inner at magnet, can not dismantle it and detect and repair, and the poor quality of any one joint will affect the performance of whole magnet, even whole magnet is scrapped.Therefore, make center tap in the Large Magnetic system and must have very high reliability.For general combination magnet or magnet system, although joint can be placed on more exposed to contact place, owing to whole magnet need to be operated under the low temperature environment of sealing, thereby regular detection is carried out in butt joint and reparation also is unpractical.Therefore must guarantee the high reliability of joint quality.For the superconducting magnet of operation with closed ring, the performance of joint has also directly determined service behaviour and the continuous working period of magnet.
Basic demand to superconducting line joint is that joint must have lower resistance on the one hand.The operating current of superconducting magnet generally reaches order of amps up to a hundred even thousands of, and resistance too conference causes serious Joule heat loss, may cause magnet quenching.For the superconducting magnet of operation with closed ring, connection resistance has caused the decay in magnetic field.If require the stability in magnetic field to reach certain level, then require the resistance of joint less than certain certain value, for example for the NMR magnet system, generally to need the resistance of superconducting joint not to be higher than 10 -12Ohm.To have certain mechanical strength and toughness to bear the shrinkage stress that is subject in bending stress, the electromagnetic stress under the operating state and the cooling procedure in the magnet winding process on the other hand.
At present about Nb 3The manufacture method of Sn superconducting line joint, mainly can be divided into two classes according to making joint and heat treated precedence relationship: a class is made joint before superconducting line heat treatment, another kind of is to make joint after superconducting line heat treatment.
In the first kind method, United States Patent (USP) 5111574 discloses a kind of Nb 3Sn superconducting line joint manufacture method.Nb silk and the Sn silk of described structure superconducting line are mixed, and Sn, Cu and the metal levels such as V, Nb, Ta are wrapped up respectively in the outside, generate superconducting line joint by the heat treatment reaction.Sn silk in the method is liquid in heat treatment process, and is very high to the sealing requirements of jacket on the one hand, and this is in Practical Project uses, and difficulty realizes.Liquid pure Sn can cause hot corrosion to wrapper material (such as Cu) on the other hand, affects the joint effect.In addition, the copper base brazing technology also once was used to make Nb 3The making of Sn superconducting line joint does not connect owing to really forming superconduction, and the connection resistance value only is 10 -9Ohm is not suitable as the technology that the butt joint resistance value such as NMR is had relatively high expectations.Although above method has been avoided after the heat treatment superconducting line to become fragile making the superconducting line that brings to joint losing danger, these existing method current capacities are very weak.In order to reduce connection resistance, generally can be forced to extending connector resistance, so that joint is bulky.
In the another kind of method, U.S. Airco company is once with the reacted Nb of heat treatment 3Electric resistance welding is directly carried out in the Sn wire terminal, and connection resistance only is 10 -8Ohm.U.S. GE company once adopted the TIG solder technology that the Nb-Sn-Cu-Pb gold alloy solder is connected on the superconducting line joint, formed superconduction and connected, and resistance value reaches and is lower than 10 -12Ohm, but be easy to the superconducting line injury under the welding condition of 2100 ℃ of high temperature.U.S. GE company also once adopted chemical vapour deposition (CVD) (CVD) in the method for joint deposition superconducting layer in addition, the method complex process, environmental requirement harshness, and be not suitable for the engineering use.The problem of this class methods maximum is Nb 3The Sn superconducting line is embrittlement own after heat treatment, accidental loses damage and the forfeiture that is easy to cause superconductivity.
To sum up analyze existing Nb 3Sn superconducting line joint method still can not satisfy Bronze Process Nb 3The engineering requirements of Sn superconducting line joint is badly in need of the low and preparation process of a kind of resistivity of exploitation and the superconductivity of superconducting line is damaged is threatened little Bronze Process Nb 3Sn superconducting line joint preparation method.
Summary of the invention
The object of the invention is to overcome the problems such as joint non-superconducting connections that exist in the existing superconducting line joint method, superconducting line easy damaged, the complicated harshness of process conditions, a kind of Bronze Process Nb of proposition 3Sn superconductor multi-core wire connector and preparation method thereof, the present invention can realize that superconduction connects, and reduces connection resistance.
Technical program of the present invention lies in:
A kind of Bronze Process Nb 3The Sn superconductor multi-core wire connector, the structure of joint is respectively from the inner to the outer: stablize core, superconduction linkage unit, Nb pipe and Cu pipe, fit tightly between above-mentioned each level.The superconduction linkage unit is respectively Nb silk, Nb from the inner to the outer 3Sn compound layer, Cu-Sn alloy layer, wherein the Nb silk of different superconductor split conductor to be connected overlaps Nb silk surface deposition Cu-Sn alloy layer, Nb mutually in the same superconduction linkage unit 3The Sn compound layer is that Nb silk and Cu-Sn alloy layer between in the heat treatment course of reaction generate by solid-state diffusion, the Nb on different superconductor split conductor Nb silk surfaces 3The superconduction connection function is played in the mutual bridge joint conducting of Sn compound layer, so that Bronze Process Nb 3The joint of Sn superconductor split conductor keeps low resistance, low-loss under superconducting temperature.
The present invention prepares above-mentioned Bronze Process Nb 3The method of Sn superconductor multi-core wire connector, the preparation process order is as follows:
(1) corrosion Nb 3The bronze matrix of Sn superconductor split conductor end is exposed the stable core and the Nb silk that scatter;
(2) the Nb silk with different superconductor split conductors to be connected mixes mutually, mutually overlap, and the colligation of Cu silk is fixed as far as possible;
(3) by deposition technique, make Nb silk Surface Creation one deck Cu-Sn alloy layer of joint;
(4) joint is put respectively from the inside to the outside Nb pipe and Cu pipe, and pressed joint, the Nb silk that deposits the Cu-Sn alloy layer closely is embedded in Nb pipe and the Cu pipe;
(5) behind the outer coating of joint high-temperature insulation material, be fixedly mounted on the coil assigned address;
(6) butt joint is heat-treated, at Nb 3Sn superconductor multi-core wire connector place generates Nb by solid-state diffusion 3Sn superconduction bridge layer, thus the superconduction that realizes joint connects.
Wherein, deposition process can adopt electroplating deposition or electroless deposition method.
Wherein, joint Nb thickness of pipe wall is the 0.5-2 millimeter, and the Cu thickness of pipe wall is the 0.5-2 millimeter, and the length of Nb pipe and Cu pipe should be able to cover the Nb silk.
Wherein, the outside high-temperature insulation material that coats of joint is the alkali-free glass wool fiber cloth.
Wherein, the Nb at the heat treatment temperature of butt joint, temperature retention time and heat-treating atmosphere and joint place 3The heat treatment temperature of Sn coil, temperature retention time and heat-treating atmosphere are identical, and the heat treatment of butt joint is with the Nb at joint place 3The Technology for Heating Processing of Sn coil is finished simultaneously.
Wherein, the heat treatment temperature of butt joint is 650-690 ℃, and temperature retention time is 100-190 hour, and heat-treating atmosphere requires inert gas or vacuum.
Bronze Process Nb of the present invention 3Sn superconductor multi-core wire connector and preparation method, then one of characteristics by by surface diposition in conjunction with heat treatment technics, make Bronze Process Nb 3The Nb that generates by solid-state diffusion on the Nb silk of Sn superconductor split conductor 3The mutual bridge joint of Sn superconducting compound layer linked up, and realized that the superconduction between the different superconducting lines connects.This greatly reduces the resistance value of superconducting line joint under the low-temperature working state, improves the current capacity of magnet, reduces the joint volume.Another characteristics are Bronze Process Nb of the present invention 3The Sn superconductor multi-core wire connector is at Nb 3Preparation is finished before the heat treatment of Sn superconducting line.This has been avoided owing to Nb after the heat treatment 3The reason that the Sn superconducting line itself becomes fragile, the superconducting line accident that may cause are lost and are destroyed the danger of whole superconductivity.
Description of drawings
Fig. 1 Bronze Process Nb 3Sn superconductor split conductor cross-sectional structure schematic diagram of (bronze-Nb silk multicore machinery recombination line) before heat treatment;
Fig. 2 Bronze Process Nb 3The structural representation of Sn superconductor multi-core wire connector;
Fig. 3 Bronze Process Nb 3Sn superconductor multi-core wire connector preparation method flow chart;
Fig. 4 Bronze Process Nb to be connected 3The bronze matrix of Sn superconductor split conductor end is corroded and exposes the schematic diagram of Nb silk;
Fig. 5 Bronze Process Nb to be connected 3The schematic diagram that Sn superconductor split conductor Nb silk holds together to put together and mutually overlaps;
Bronze Process Nb before Fig. 6 heat treatment 3Sn superconductor multi-core wire connector structural representation.
Embodiment
Further specify the present invention below in conjunction with the drawings and specific embodiments.
As shown in Figure 2, Bronze Process Nb of the present invention 3The structure of Sn superconductor multi-core wire connector is respectively from the inner to the outer: stablize core, superconduction linkage unit, Nb pipe and Cu pipe.Fit tightly between each level.Described superconduction linkage unit is respectively Nb silk, Nb from the inside to the outside 3Sn compound layer and Cu-Sn alloy layer, wherein the Nb silk of different superconductor split conductors to be connected overlaps mutually in the same superconduction linkage unit.
Bronze Process Nb of the present invention 3The manufacture method of Sn superconductor multi-core wire connector is as follows:
As shown in Figure 3, first with the Bronze Process Nb that does not heat-treat more than two or two to be connected 3The bronze matrix of the end of Sn superconductor split conductor erodes, and exposes one section Nb silk that evenly scatters, as shown in Figure 4.The Nb silk is thoroughly cleaned, remove oil stain and the dust on surface; Then with the Nb more than two or two to be connected 3Stable core and the Nb silk of Sn superconductor split conductor hold together to put together, make the Nb silk be in contact with one another overlap joint, as shown in Figure 5 as far as possible.And with thin Cu silk the Nb silk colligation that overlaps is fixed; Then use electroless deposition or electroplating deposition mode that the superconductor split conductor Nb silk of joint is plated the Cu-Sn alloy layer, the Cu-Sn alloy layer connects as one the Nb silk of different superconductor split conductors.Again the joint of Cu-Sn alloy layer cleaned and drying and processing, thoroughly removed plating bath or oxide impurity layer on the joint.The joint that cleans up is put pure Nb pipe and pure Cu pipe from inside to outside successively, the wall thickness of pure Nb pipe and pure Cu pipe is the 0.5-2.0 millimeter, the length of pure Nb pipe and pure Cu pipe slightly is longer than the length that the superconductor split conductor corrodes the Nb silk that exposes, one end of pure Nb pipe and pure Cu pipe is longer than Nb silk end, and the other end is longer than Nb silk root.Pure Cu pipe and the flattening of pure Nb pipe are compressed, the Nb silk that deposits the Cu-Sn alloy layer closely is embedded in Nb pipe and the Cu pipe, prevent that the Nb silk is moved at pure Cu pipe and pure Nb pipe inside, Figure 6 shows that the Bronze Process Nb that heat treatment is front 3Sn superconductor multi-core wire connector structural representation.Joint integral body outside is coated high-temperature insulation material, and be fixedly mounted on the coil assigned address; Last joint is with the Nb at its place 3The Sn coil places heat-treatment furnace to carry out diffusion heat treatments in the lump, and the bronze in coil-Nb silk multicore machinery recombination line generates the Nb that possesses superconductivity by solid-state diffusion 3In the time of the Sn compound layer, the Nb silk in the joint and the reaction of Cu-Sn alloy layer generate the Nb that possesses superconductivity by solid-state diffusion 3Sn superconducting compound layer.Heat treatment temperature is 650-690 ℃, and temperature retention time is 100-190 hour, and heat-treating atmosphere requires inert gas or vacuum.The Nb at the heat treatment temperature of joint, temperature retention time and heat-treating atmosphere and joint place 3The heat treatment temperature of Sn coil, temperature retention time and heat-treating atmosphere are identical.Nb 3The mutual UNICOM of Sn superconducting compound layer, can bridge joint different superconductor split conductors, thus realize the superconduction connection of joint.
Wherein high-temperature insulation material can be alkali-free glass core fibre cloth.
Execution mode 1
In the present embodiment, Bronze Process Nb to be connected 3The external diameter of Sn superconductor split conductor is 0.9 millimeter, 4.5 microns of single Nb filament diameters.Use first red fuming nitric acid (RFNA) with two Bronze Process Nb to be connected 3The bronze matrix of the end of Sn superconductor split conductor erodes, and exposes pure Nb silk part, exposes 30 millimeters of Nb filament length degree.The Nb silk at butt joint position cleans and dries.Then the Nb silk with the superconductor split conductor partly holds together together, the Nb silk of two lines is overlapped as far as possible mutually, and fix with the colligation of thin Cu silk.Joint is carried out electroplating deposition Cu-Sn alloy-layer again and process, the composition proportion of electroplating deposition electrolyte is: SnCl 22H 2O---40 grams per liters, NaF---30 grams per liters, N (CH 2COOH) 3---20 grams per liters, CuSO 45H 2O---30 grams per liters, EDTA 45 grams per liters, citric acid---10 grams per liters, polyoxyethylene aliphatic ether---2 grams per liters, deionized water---surplus, PH=5.5.In the electroplating deposition process, the pure tin plate that surface area is identical and pure Cu plate as negative electrode, pass to current density 0.1-0.6A/dm with joint area as anode 2Low voltage direct current, 30 ℃ ± 2 ℃ of electroplating deposition temperature requirements.Butt joint electroplating deposition position adopts the chemical pure alcoholic solution to clean and dry subsequently.Again joint is put respectively from the inside to the outside pure Nb pipe and pure Cu pipe, 3.5 millimeters of Nb bores, 0.5 millimeter of wall thickness, long 40 millimeters; 4.5 millimeters of Cu bores, 0.5 millimeter of wall thickness, long 40 millimeters.Pure Nb pipe and the alignment of pure Cu pipe cover whole blank area, and the two ends of pure Nb pipe and pure Cu pipe respectively grow 5 millimeters than Nb silk.Adopt hydraulic tongs that pure Nb pipe and pure Cu pipe are compressed distortion, the Nb silk that deposits the Cu-Sn alloy layer fixedly is embedded in Nb pipe and the Cu pipe, make the joint area sealing solid, and after the outer coating of joint alkali-free glass wool fiber cloth, be fixed on the magnet coil assigned position.Joint is put in the lump heat-treatment furnace with coil and is carried out diffusion heat treatments subsequently.650 ℃ of heat treatment temperatures, temperature retention time 190 hours, vacuum heat, vacuum degree 10 -3Pa.The complete rear Slow cooling of heat treatment is to room temperature.Superconducting joint prepares complete.Through experimental test, connection resistance is 9 * 10 -12Ohm.
Execution mode 2
In the present embodiment, Bronze Process Nb to be connected 3The diameter of Sn superconductor split conductor is 0.7 millimeter, 4.5 microns of single Nb filament diameters.Use first red fuming nitric acid (RFNA) with two Bronze Process Nb to be connected 3The bronze matrix partial corrosion of the end of Sn superconductor split conductor falls, and exposes pure Nb silk part, exposes 40 millimeters of Nb filament length degree.The Nb silk at butt joint position cleans and dries.Then the Nb silk with the superconductor split conductor partly holds together together, makes two Nb 3The Nb silk of Sn superconductor split conductor overlaps as far as possible mutually, and fixes with the colligation of thin Cu silk.Joint is carried out electroless deposition Cu-Sn alloy-layer again and process, the composition proportion of electroless deposition electrolyte is: SnCl 22H 2O---30 grams per liters, NaF---30 grams per liters, N (CH 2COOH) 3---25 grams per liters, CuSO 45H 2O---20 grams per liters, EDTA---25 grams per liters, citric acid---7 grams per liters, polyoxyethylene aliphatic ether---1 grams per liter, deionized water---surplus, PH=4.30 ℃ ± 2 ℃ of electroless deposition temperature requirements.Butt joint electroless deposition position adopts absolute alcohol solution to clean and dry subsequently.Again joint is put respectively from the inside to the outside pure Nb pipe and pure Cu pipe, 3 millimeters of Nb bores, 2 millimeters of wall thickness, long 50 millimeters; 7 millimeters of Cu bores, 2 millimeters of wall thickness, long 50 millimeters.Pure Nb pipe and the alignment of pure Cu pipe cover whole blank area, adopt hydraulic tongs that pure Nb pipe and pure Cu pipe are compressed distortion, the Nb silk that deposits the Cu-Sn alloy layer closely is embedded in Nb pipe and the Cu pipe, make the joint area sealing solid, and after the outer coating of joint alkali-free glass wool fiber cloth, be fixed on the magnet coil assigned position.Joint is put in the lump heat-treatment furnace with coil and is carried out diffusion heat treatments subsequently.690 ℃ of heat treatment temperatures, temperature retention time 100 hours, heat-treating atmosphere is the argon gas that flows, 0.1～0.2 liter/min of clock of flow.The complete rear Slow cooling of heat treatment is to room temperature.Superconducting joint prepares complete.Through experimental test, connection resistance is 8 * 10 -12Ohm.

Claims (6)

1. Bronze Process Nb 3The preparation method of Sn superconductor multi-core wire connector is characterized in that the making step order is as follows:
(1) corrosion Nb 3The bronze matrix of Sn superconductor split conductor end is exposed the stable core and the Nb silk that scatter;
(2) the Nb silk with different superconductor split conductors to be connected mixes mutually, mutually overlaps, and fixes with the colligation of Cu silk;
(3) by deposition process, make Nb silk Surface Creation one deck Cu-Sn alloy layer of described joint;
(4) described joint is put respectively from the inside to the outside Nb pipe and Cu pipe, and pressed joint, the Nb silk that deposits the Cu-Sn alloy layer closely is embedded in Nb pipe and the Cu pipe;
(5) behind the outer coating of joint high-temperature insulation material, be fixedly mounted on the coil assigned address;
(6) with joint heat treatment, at Nb 3Sn superconductor multi-core wire connector place generates Nb by solid-state diffusion 3Sn superconduction bridge layer realizes that the superconduction of joint connects.
2. preparation method according to claim 1 is characterized in that described deposition process adopts electroplating deposition or electroless deposition.
3. preparation method according to claim 1 is characterized in that described Nb thickness of pipe wall is the 0.5-2 millimeter, and the Cu thickness of pipe wall is the 0.5-2 millimeter, and the length of Nb pipe and Cu pipe all can cover the Nb silk.
4. preparation method according to claim 1 is characterized in that the outer high-temperature insulation material that coats of described joint is the alkali-free glass wool fiber cloth.
5. preparation method according to claim 1, it is characterized in that heat treatment temperature, temperature retention time and heat-treating atmosphere to described joint are identical with heat treatment temperature, temperature retention time and the heat-treating atmosphere of the coil at joint place, and the heat treatment of the coil at the heat treatment of described joint and joint place is finished simultaneously.
6. preparation method according to claim 1 or 5, the heat treatment temperature that it is characterized in that butt joint is 650-690 ℃, and temperature retention time is 100-190 hour, and heat-treating atmosphere requires inert gas or vacuum.
CN 201210046550 2010-06-30 2010-06-30 Nb3Sn superconductor multi-core cable joint adopting bronze process and preparation method of Nb3Sn superconductor multi-core cable joint Active CN102593686B (en)

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CN103633529B (en) * 2013-11-26 2016-01-06 中国科学院电工研究所 A kind of Nb3Al superconducting joint preparation method
CN110895986B (en) * 2019-12-06 2021-08-20 中国科学院合肥物质科学研究院 Low-resistance niobium three-tin superconducting wire joint and manufacturing method thereof
CN111341495B (en) * 2020-03-13 2021-04-27 中国科学院电工研究所 Nb-shaped alloy3Sn superconducting wire repairing method
CN115740715A (en) * 2022-11-29 2023-03-07 北京工业大学 Method for preparing niobium-titanium wire and niobium-tin mixed superconducting joint by electron beam welding

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US5111574A (en) * 1988-12-05 1992-05-12 Teledyne Industries, Inc. Method and apparatus for producing superconducting joints
CN1873847A (en) * 2006-05-25 2006-12-06 中国科学院等离子体物理研究所 Cold end of heavy current lead out wire made from high-temperature superconductor, and low resistance connector of superconducting transmission line
CN1865457A (en) * 2006-06-13 2006-11-22 中国科学院电工研究所 Heat treatment method for iron base MgB2 superconductor wire and belt
CN101517660A (en) * 2006-09-29 2009-08-26 株式会社神户制钢所 NbTi superconducting wire rod
JP2009231201A (en) * 2008-03-25 2009-10-08 Kobe Steel Ltd NbTi-BASED SUPERCONDUCTING WIRE MATERIAL AND ITS MANUFACTURING METHOD
CN101694908A (en) * 2009-09-30 2010-04-14 中国科学院等离子体物理研究所 Low temperature superconducting assembly with low joint resistance for high temperature superconducting current lead cold end

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