Bronze process Nb3Sn superconductor multi-core wire connector and preparation method thereof

A superconductor, multi-core wire technology, applied in the direction of connecting contact material, connection, circuit/collector parts, etc., can solve the problems of reducing joint resistance, joint non-superconducting connection, superconducting wire easily damaged, etc. The effect of reducing the size of the joint, reducing the resistance value, and improving the current carrying capacity

Active Publication Date: 2010-11-17
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to overcome the existing problems in the existing superconducting wire joint method, such as joint non-superconducting connection, superconducting wire is easy to damage, complex and harsh process conditions, etc., 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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  • Bronze process Nb3Sn superconductor multi-core wire connector and preparation method thereof
  • Bronze process Nb3Sn superconductor multi-core wire connector and preparation method thereof
  • Bronze process Nb3Sn superconductor multi-core wire connector and preparation method thereof

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Embodiment approach 1

[0039] Embodiment 1: 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 8n superconductor multi-core wire is corroded, exposing the pure Nb wire part, and the exposed Nb wire has a length of 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 ...

Embodiment approach 2

[0040] Embodiment 2: 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...

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Abstract

The invention discloses a bronze process Nb3Sn superconductor multi-core wire connector and a preparation method thereof. From an inner layer to an outer layer, the connector structure comprises a stabilizing core, a super-conduction connection unit, an Nb tube and a Cu tube which are adhered to one another tightly. The super-conduction unit comprises an Nb wire, an Nb3Sn compound layer and a Cu-Sn alloy coating from the inner layer to the outer layer, wherein the Nb wires of different superconductor multi-core wires to be connected in the same super-conduction connection unit are overlapped mutually; the Cu-Sn alloy coating is deposited on the surface of the Nb wire; the Nb3Sn compound layer is generated by solid dispersion between the Nb wire and the Cu-Sn alloy coating in a thermal-treatment reaction process; the Nb3Sn compound layers on the surfaces of the different superconductor multi-core Nb wires are bridged and communicated mutually to conduct a super-conduction function; and thus, the bronze process Nb3Sn superconductor multi-core wire connector keeps low impedance and low loss at a super-conduction temperature.

Description

technical field [0001] The invention relates to a bronze process Nb 3 Sn superconductor multi-core wire joint and its preparation method. Background technique [0002] 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. [0003] 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 mechanical composite structure. The inner-tin method wire is a mechanical composite structure in which Sn wire is inserted in a multi-Cu / Nb composite tube. Both of the above two wires need to be heat-treated at an appropriate temperature to form superconductive Nb through soli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R4/68H01R43/00H01R43/28
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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