Superconducting joint of NbTi and Nb3Sn superconducting wires and preparation method of superconducting joint

A technology of superconducting joints and superconducting wires, which is applied in the directions of superconducting magnets/coils, coil manufacturing, connecting contact materials, etc., can solve the problems of complex processes, the preparation method of Sn superconducting wire joints, and the large joint resistance.

Active Publication Date: 2020-06-05
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

[0005] The current preparation techniques for preparing superconducting joints include brazing, cold pressure welding, fusion welding, sintering, etc. The prepared joints have high resistance and complicated processes
The preparation of low-resistance NbTi / Nb has not been found 3 Preparation method of Sn superconducting wire joint

Method used

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  • Superconducting joint of NbTi and Nb3Sn superconducting wires and preparation method of superconducting joint
  • Superconducting joint of NbTi and Nb3Sn superconducting wires and preparation method of superconducting joint
  • Superconducting joint of NbTi and Nb3Sn superconducting wires and preparation method of superconducting joint

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Corrosion of Nb with 50% nitric acid 3 The copper layer at the end of the Sn superconducting wire, the length of the corrosion section is 1cm, and the Nb is exposed 3 Nb filaments and supporting cores in Sn superconducting wires. Remove Nb 3 The support core at the end of the Sn superconducting wire, etched Nb with a mixed acid of 30% by volume nitric acid and 20% by volume hydrofluoric acid 3 For the Nb filaments at the ends of the Sn superconducting wires, clean the Nb filaments with deionized water, spread them out and blow them dry. The copper layer at the end of the NbTi superconducting wire is etched with nitric acid with a volume fraction of 50%, and the length of the etched section is 1 cm, exposing the NbTi wire in the NbTi superconducting wire. Corrode the NbTi wire at the end of the NbTi superconducting wire with a mixed acid of 30% nitric acid and 20% hydrofluoric acid by volume, clean the NbTi wire with deionized water, spread it out and blow dry. Inser...

Embodiment 2

[0042] Corrosion of Nb with 60% nitric acid 3 The copper layer at the end of the Sn superconducting wire, the length of the etched section is 10cm, and the Nb is exposed 3 Nb filaments and supporting cores in Sn superconducting wires. Remove Nb 3 The support core at the end of the Sn superconducting wire, etched Nb with a mixed acid of 70% by volume nitric acid and 5% by volume hydrofluoric acid 3 For the Nb filaments at the ends of the Sn superconducting wires, clean the Nb filaments with deionized water, spread them out and blow them dry. The copper layer at the end of the NbTi superconducting wire is etched with nitric acid with a volume fraction of 60%, and the length of the etched section is 10 cm, so as to expose the NbTi wire in the NbTi superconducting wire. Corrode the NbTi wire at the end of the NbTi superconducting wire with a mixed acid of 70% nitric acid and 5% hydrofluoric acid by volume, clean the NbTi wire with deionized water, spread it out and blow dry. I...

Embodiment 3

[0044] Corrosion of Nb with 55% nitric acid 3 The copper layer at the end of the Sn superconducting wire, the length of the corrosion section is 5cm, and the Nb is exposed 3 Nb filaments and supporting cores in Sn superconducting wires. Remove Nb 3 The support core at the end of the Sn superconducting wire is etched with a mixed acid of 50% nitric acid and 15% hydrofluoric acid by volume for Nb 3 For the Nb filaments at the ends of the Sn superconducting wires, clean the Nb filaments with deionized water, spread them out and blow them dry. The copper layer at the end of the NbTi superconducting wire is etched with nitric acid with a volume fraction of 55%, and the length of the etched section is 5 cm, exposing the NbTi wire in the NbTi superconducting wire. Corrode the NbTi wire at the end of the NbTi superconducting wire with a mixed acid of 50% nitric acid and 15% hydrofluoric acid by volume, clean the NbTi wire with deionized water, spread it out and blow dry. Insert th...

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Abstract

The invention provides a superconducting joint of NbTi and Nb3Sn superconducting wires and a preparation method thereof. The joint is characterized in that the joint comprises a Cu layer, a first Nb plate (1), Nb wires, a second Nb plate (2) and NbTi wires; the first Nb plate (1) and the second Nb plate (2) are coated with the Cu layer; the Nb wires are embedded into the first Nb plate (1) to achieve metallurgical bonding; the NbTi wires are embedded into the second Nb plate (2) to achieve metallurgical bonding; the first Nb plate (1) and the second Nb plate (2) are connected through argon arcwelding; and the first Nb plate (1) and the second Nb plate (2) are respectively made of a cylindrical first Nb pipe and a cylindrical second Nb pipe through a hydraulic forming process.

Description

technical field [0001] The present invention relates to a kind of NbTi and Nb 3 Sn superconducting wire joint and its preparation method. Background technique [0002] With the rapid development of superconducting engineering technology and superconducting materials, high-energy physics under extreme conditions, superconducting motors, high-magnetic field material processing, magnetic levitation and other fields require superconducting magnets with high magnetic field conditions. Low-temperature superconducting magnets are needed to provide background magnetic fields in high-field superconducting magnets. Superconducting magnets are made of superconducting wires. Due to the limited length of superconducting wires, it is difficult to wind a superconducting wire into a whole superconducting magnet. Multiple joints are needed to connect the superconducting wires. At the same time, multiple coils also need Superconducting joints connected in series. [0003] The number of sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F6/06H01R4/68H01F41/04H01R43/00H01R43/02
CPCH01F6/06H01F41/048H01R4/68H01R43/00H01R43/02
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
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