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A nb of inner tin process 3 Sn superconducting wire joint and preparation method thereof

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

Active Publication Date: 2021-01-29
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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  • A nb of inner tin process <sub>3</sub> Sn superconducting wire joint and preparation method thereof
  • A nb of inner tin process <sub>3</sub> Sn superconducting wire joint and preparation method thereof
  • A nb of inner tin process <sub>3</sub> Sn superconducting wire joint and preparation method thereof

Examples

Experimental program
Comparison scheme
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

A kind of inner tin process Nb 3 Sn superconducting wire joint and its preparation method, respectively from outside to inside, copper tube, Nb 3 Sn joint part, Nb tow. The Nb tow is located in the center of the copper tube, and Nb is between the Nb tow and the inner wall of the copper tube 3 Sn joint part. Nb 3 Sn linker part includes Nb 3 Sn sintered block, Nb powder, Sn powder and Cu powder. Nb 3 The Sn sintered block consists of two parts: one part is formed by high-temperature diffusion reaction of Nb powder, Sn powder and Cu powder, and the other part is formed by bronze process Nb after high-temperature heat treatment reaction. 3 Nb stripped from Sn wire 3 Sn multi-filament, then ball milled into powder and sintered. Nb tow is made of unheated Nb 3 The Sn superconducting wire is made by removing the stable layer Cu, the diffusion barrier layer Ta and the inner Sn, and weaving the remaining Nb multifilaments. Inner tin process Nb 3 The incoming and outgoing wires of the Sn test coil undergo high-temperature heat treatment to form a superconducting connection at the joint. The present invention Nb 3 Sn superconducting joints have a high critical magnetic field and low electrical 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 Patents(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