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Manufacturing method of NbTi superconductor split conductor joint

A multi-core wire and superconductor technology, applied in the direction of connecting contact material, connection, circuit/collector parts, etc., can solve the problems of unstable quality, complex and harsh process conditions, etc., achieve stable and reliable quality, reduce joint resistance, Stable quality effect

Active Publication Date: 2015-04-22
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

[0008] The purpose of the present invention is to solve the problems of unstable quality and complex and harsh process conditions in the existing preparation technology of NbTi superconductor multi-core wire superconducting joints in the manufacturing process of the superconducting magnet system of nuclear magnetic resonance spectrometer, and propose a multi-layer composite NbTi superconductor multi-core wire joint with wedge structure characteristics and preparation method thereof

Method used

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  • Manufacturing method of NbTi superconductor split conductor joint
  • Manufacturing method of NbTi superconductor split conductor joint
  • Manufacturing method of NbTi superconductor split conductor joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A joint of two NbTi superconductor multi-core wires of the same specification is prepared, wherein the wire diameter of the NbTi superconductor multi-core wire is 0.75 mm, and the diameter of a single superconductor wire is 10 μm.

[0059] Select a pure copper rod with a purity better than 99.999%, and punch the pure copper rod in the axial direction; insert a pure niobium or NbTi superconducting rod into the hole, and the interference fit between the superconducting rod and the hole forms a composite rod; The diameter of the composite rod is thinned by drawing or hot rolling until the outer diameter of the composite rod reaches 5mm; the composite rod is subjected to stress relief annealing; the composite rod is cut into a composite short rod with a length of 30mm; from the center of the composite short rod along the axial direction A through hole with a diameter of 1.8 mm is drilled in the superconducting material layer to form a superconducting composite tube; the supe...

Embodiment 2

[0062] Prepare the joints of two NbTi superconductor multi-core wires with different specifications, wherein, the wire diameter of NbTi superconductor multi-core wire A is 0.75 mm, and the diameter of a single superconductor wire is 5 μm; the wire diameter of NbTi superconductor multi-core wire B is 0.60 mm, and the diameter of a single The diameter of the superconducting wire is 5 μm.

[0063]Select a pure copper tube with a purity better than 99.999%, with an outer diameter of 5mm and an inner diameter of 4mm; insert a pure Nb or NbTi superconducting alloy tube into the pure copper hole, and the superconducting alloy tube has an outer diameter of 4mm and an inner diameter of 1.5mm. The interference fit between the superconducting alloy tube and the pure copper hole constitutes a superconducting composite tube; the superconducting composite tube is vacuum annealed for stress relief. Remove the copper matrix at the end of the NbTi superconductor multi-core wire, exposing the s...

Embodiment 3

[0066] Prepare the joints of two NbTi superconductor multi-core wires with different specifications, wherein, the wire diameter of NbTi superconductor multi-core wire A is 1.00 mm, and the diameter of a single superconductor wire is 6 μm; the wire diameter of NbTi superconductor multi-core wire B is 0.80 mm, and the diameter of a single The diameter of the superconducting wire is 6 μm.

[0067] Select a pure copper rod with a purity better than 99.999%, punch the pure copper rod in the axial direction; insert the NbTi superconducting rod into the hole, and the interference fit between the superconducting rod and the hole forms a composite rod; mechanical drawing or The diameter of the composite rod is thinned by the hot rolling process; the composite rod is subjected to stress relief annealing treatment; the above two steps of thinning and annealing are repeated until the outer diameter of the composite rod reaches 5 mm; the composite rod is cut into a short composite rod with ...

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Abstract

The invention discloses a manufacturing method of an NbTi superconductor split conductor joint. The method comprises the following steps: (1) removing copper substrates from the end parts of different NbTi superconductor split conductors to be connected to expose scattered NbTi superconductor clusters (3); (2) mixing and twisting the NbTi superconductor clusters (3) of the different NbTi superconductor split conductors to be connected, and inserting into a super-conduction composite tube with the end parts of the NbTi superconductor clusters (3) surpassing the super-conduction composite tube; (3) filling a super-conduction filling material (4) into the super-conduction composite tube till gaps among the super-conduction composite tube and the NbTi superconductor clusters (3) are filled; (4) laterally extruding the super-conduction composite tube to deform the super-conduction composite tube so as to form a super-conduction composite layer (5); adjusting the magnitude of the extruding force to make the cross sectional area of the super-conduction composite layer (5) decrease gradually from a root part to an end part, wherein the super-conduction composite layer (5) is wedge-shaped, and has a rectangular cross section and a trapezoidal longitudinal section; (5) plating soldering tin on the outer wall surface of the super-conduction composite layer (5) to form a tin soldering layer (8); and (6) coating an insulating material outside the tin soldering layer (8) to form an insulating layer (9).

Description

[0001] This application is a divisional application of the invention patent application titled "A NbTi superconductor multi-core wire joint and its preparation method" (application number: 201110347318.3, application date: November 6, 2011). technical field [0002] The invention relates to a low-temperature superconducting wire joint and a preparation method thereof, in particular to a NbTi superconductor multi-core wire joint which can be used in a nuclear magnetic resonance spectrometer superconducting magnet system and a preparation method thereof. Background technique [0003] The NMR spectrometer is an important scientific instrument and equipment in the field of modern biomedical research, and its core component is a superconducting magnet system capable of generating a high-uniformity constant magnetic field with a magnetic field strength of several or even more than a dozen Teslas. In order to meet the requirements of the NMR system for the special magnetic field sha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01R4/68H01R43/00
Inventor 程军胜宋守森刘建华王秋良
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI