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Nb3Sn superconducting wire joint adopting internal tin process and preparation method of Nb3Sn superconducting wire joint

A superconducting wire and process technology, applied in the field of Nb3Sn superconducting wire joints and its preparation, can solve the problems of complex process and high resistance of Sn superconducting joints

Active Publication Date: 2020-06-09
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome complex process in the prior art, the prepared Nb 3 Sn superconducting joint resistance is higher, and mainly for Nb of bronze process 3 Insufficiency of the preparation method of Sn superconducting joints, an inner tin process Nb 3 Sn superconducting wire joint and its preparation method

Method used

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  • Nb3Sn superconducting wire joint adopting internal tin process and preparation method of Nb3Sn superconducting wire joint
  • Nb3Sn superconducting wire joint adopting internal tin process and preparation method of Nb3Sn superconducting wire joint
  • Nb3Sn superconducting wire joint adopting internal tin process and preparation method of Nb3Sn superconducting wire joint

Examples

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Effect test

Embodiment 1

[0042] First, a 10-meter-long bronze process Nb without high-temperature heat treatment 3 Sn superconducting wire undergoes high-temperature heat treatment reaction, and the reaction is completed to obtain Nb 3 Sn superconducting wire short sample. Erosion of Nb with 50% nitric acid 3 Short sample of Sn superconducting wire, removing the outer copper protective layer to obtain scattered Nb 3 Sn superconducting wire. Wash Nb with deionized water and alcohol 3 After Sn superconducting wire, blow dry. Then the dried Nb 3 The Sn superconducting wire was taken out and the superconducting wire was ball milled for 0.5h to obtain Nb 3 Sn powder.

[0043] Corrosion of inner tin process Nb with 50% nitric acid 3 Sn test the copper protective layer at the wire inlet and outlet of the coil, and the length of the corrosion section is 5cm. Then remove the Ta layer covered by the outer layer of the corrosion section to obtain scattered Nb multifilaments. Weave two strands of the lo...

Embodiment 2

[0049] First, a 10-meter-long bronze process Nb without high-temperature heat treatment 3 The Sn wire undergoes a high-temperature heat treatment reaction, and the reaction is completed to obtain Nb 3 Sn superconducting wire short sample. Erosion of Nb with 75% nitric acid 3 Short sample of Sn superconducting wire, removing the outer copper protective layer to obtain scattered Nb 3 Sn superconducting wire, after cleaning with deionized water and alcohol, blow dry. Then the dried Nb 3 Take out the Sn superconducting wire and ball mill for 1h to get Nb 3 Sn powder.

[0050] Corrosion of inner tin process Nb with 75% nitric acid 3 Sn test the copper protective layer at both ends of the incoming and outgoing wires of the coil, and the length of the corrosion section is 10cm. Then remove the Ta layer covered by the outer layer of the corrosion section to obtain scattered Nb multifilaments. Weave two strands of the loose Nb multifilaments into a bundle to form a Nb multifila...

Embodiment 3

[0055] First, a 10-meter-long bronze process Nb without high-temperature heat treatment 3 Sn superconducting wire undergoes high-temperature heat treatment reaction, and the reaction is completed to obtain Nb 3 Sn superconducting wire short sample. Corroding the Nb with a volume fraction of 60% nitric acid 3 Short sample of Sn superconducting wire, removing the outer copper protective layer to obtain scattered Nb 3 Sn superconducting wire. Wash the Nb with deionized water and alcohol, respectively 3 Sn superconducting wire, blow dry with a hair dryer. The dried Nb 3 The Sn superconducting wire was taken out and ball milled for 40 minutes to obtain Nb 3 Sn powder.

[0056] Corrosion of inner tin process Nb with 60% nitric acid 3 The copper protection layer at the inlet and outlet ends of the Sn test coil, the length of the corrosion section is 8cm, and the Ta layer covered by the outer layer of the corrosion section is removed to obtain scattered Nb multifilaments. Wea...

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Abstract

The invention discloses an Nb3Sn superconducting wire joint adopting an internal tin process and a preparation method of the Nb3Sn superconducting wire joint. The Nb3Sn superconducting wire joint comprises a copper pipe, an Nb3Sn joint part and an Nb filament bundle from outside to inside, wherein the Nb filament bundle is located in the center of the copper pipe, and an Nb3Sn joint part is arranged between the Nb wire bundle and the inner wall of the copper pipe. The Nb3Sn joint part comprises an Nb3Sn sintered block, Nb powder, Sn powder and Cu powder. The Nb3Sn sintered block comprises twoparts, one part is generated by high-temperature diffusion reaction of the Nb powder, the Sn powder and the Cu powder, the other part is obtained by stripping Nb3Sn multifilament from a bronze processNb3Sn wire after high-temperature heat treatment reaction, and then enabling the Nb3Sn multifilament to be ball-milled into powder and sintered. The Nb filament bundle is formed by removing a stablelayer Cu, a diffusion barrier layer Ta and internal Sn from an Nb3Sn superconducting wire which is not subjected to heat treatment, and weaving the residual Nb multifilament. The wire inlet end and the wire outlet end of an Nb3Sn test coil adopting the internal tin process are subjected to high-temperature heat treatment reaction, and superconducting connection is formed at the joint part. The Nb3Sn superconducting joint is high in critical magnetic field and low in resistance.

Description

technical field [0001] The present invention relates to a kind of Nb 3 Sn superconducting wire joint and its preparation method. Background technique [0002] With the rapid development of large-scale superconducting magnet devices such as high-energy physics and magnetic confinement fusion devices, it is a great challenge to provide high-field coils of superconducting magnets with strong magnetic fields under extreme environmental multi-physics operating conditions. In contrast, the development of low-temperature superconducting coils is relatively mature, but for Nb 3 For Sn superconducting coils, its manufacturing process is extremely complicated, and the resulting A15 superconducting phase is very fragile. At present, there are still many process difficulties restricting the Nb 3 Use of Sn superconducting coils. [0003] Nb 3 Sn is currently one of the most important practical low-temperature superconducting materials, and Nb 3 Sn superconducting wire is a multi-cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R4/68H01R43/00H01F6/06H01F41/04
CPCH01F6/065H01F41/048H01R4/68H01R43/00
Inventor 孙万硕王秋良程军胜戴银明胡新宁王晖刘建华
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI