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

A technology of superconductors and multi-core wires, applied in the direction of connecting contact materials, connections, circuit/collector components, etc., can solve problems such as reducing joint resistance, joint non-superconducting connections, superconducting wires are easy to damage, etc., and achieve reduction Effects of joint volume, reduction of resistance value, and improvement of current-carrying capacity

Active Publication Date: 2013-09-18
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

[0013] The purpose of the present invention is to overcome the existing problems of non-superconducting connection of joints, easy damage of superconducting wires, complex and harsh process conditions and other problems in the existing superconducting wire joint method, and proposes a bronze process Nb 3 Sn superconductor multi-core wire joint and its preparation method, the invention can realize superconducting connection and reduce joint resistance

Method used

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

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Embodiment approach 1

[0041] In this embodiment, the bronze process Nb to be connected 3 The outer diameter of the Sn superconductor multi-core wire is 0.9 mm, and the diameter of a single Nb wire is 4.5 microns. First use concentrated nitric acid to dissolve the two bronze process Nb to be connected 3 The bronze matrix at the end of the Sn superconductor multi-core wire was corroded, exposing the pure Nb wire part, and the length of the exposed Nb wire was 30 mm. Clean and dry the Nb wire at the joint. Then put the Nb wires of the superconductor multi-core wires together so that the Nb wires of the two wires overlap each other as much as possible, and bind and fix them with thin Cu wires. Then the joint is subjected to electroplating deposition Cu-Sn alloy layer treatment, the composition ratio of electroplating deposition electrolyte is: SnCl 2 2H 2 O——40 g / L, NaF——30 g / L, N(CH 2 COOH) 3 - 20 g / L, CuSO 4 ·5H 2 O - 30 g / L, EDTA 45 g / L, citric acid - 10 g / L, polyoxyethylene fatty ether - 2 ...

Embodiment approach 2

[0043] In this embodiment, the bronze process Nb to be connected 3 The diameter of the Sn superconductor multi-core wire is 0.7 mm, and the diameter of a single Nb wire is 4.5 microns. First use concentrated nitric acid to dissolve the two bronze process Nb to be connected 3 The bronze matrix part at the end of the Sn superconductor multi-core wire was corroded to expose the pure Nb wire part, and the exposed Nb wire had a length of 40 mm. Clean and dry the Nb wire at the joint. Then put the Nb filaments of the superconductor multi-core wire together so that the two Nb wires 3 The Nb wires of the Sn superconductor multi-core wire overlap each other as much as possible, and are bound and fixed with thin Cu wires. Then the joint is subjected to electroless plating deposition Cu-Sn alloy layer treatment, the composition ratio of electroless plating deposition electrolyte is: SnCl 2 2H 2 O——30 g / L, NaF——30 g / L, N(CH 2 COOH) 3 - 25 g / L, CuSO 4 ·5H 2 O——20 g / l, EDTA——25 g / l...

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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 resisting insulation 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

[0001] This application is titled as "a kind of bronze technology Nb" 3 Sn superconductor multi-core wire joint and its preparation method" (application number: 201010221920.8, application date: June 30, 2010) is a divisional application of the invention patent application. technical field [0002] The invention relates to a bronze process Nb 3 Sn superconductor multi-core wire joint and its preparation method. Background technique [0003] Nb 3 Sn material shows good superconducting properties under the low temperature condition of 18K. Its critical transition temperature is higher than that of NbTi superconductor materials, and it is especially suitable for the construction of high magnetic field superconducting magnets. [0004] Prepare Nb according to the different wire structures 3 The method of Sn superconducting wire is mainly divided into two kinds of bronze process and internal tin method. The wire material of the bronze process is a bronze-Nb wire multi-core m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01R43/00H01R4/68
Inventor 程军胜王秋良戴银明王晖宋守森
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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