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Connection method for MgB2 superconductive wire rods

A technology of superconducting wire rod and connection method, which is applied in the direction of connection, connection contact material, circuit/collector parts, etc.

Active Publication Date: 2015-11-11
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, no information about MgB 2 Connection of superconducting wires and obtaining resistance less than 1 x 10 -10 Ohm's research on superconducting joints has been reported

Method used

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  • Connection method for MgB2 superconductive wire rods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This example MgB 2 The connecting method of the superconducting wire comprises the following steps:

[0031] Step 1. First, the first MgB 2 The end to be connected of the superconducting wire 1-1 and the second MgB 2 The ends to be connected of the superconducting wires 1-2 are wax-sealed to prevent MgB in the wires 2 The precursor powder was corroded by acid solution; then, the first MgB 2 Superconducting wire 1-1 and the second MgB 2 The superconducting wires 1-2 are all placed in a nitric acid solution for pickling treatment to remove the outer Cu cladding layer, and the HNO in the nitric acid solution 3 with H 2 The molar ratio of O is 1:1.8; after that, the first MgB after pickling treatment 2 The end to be connected of the superconducting wire 1-1 and the second MgB after pickling treatment 2 The ends to be connected of the superconducting wires 1-2 are ground into a slope shape, and the slope angle (the angle between the horizontal plane and the inclined p...

Embodiment 2

[0038] This example MgB 2 The connecting method of the superconducting wire comprises the following steps:

[0039] Step 1. First, the first MgB 2 The end to be connected of the superconducting wire 1-1 and the second MgB 2 The ends to be connected of the superconducting wires 1-2 are wax-sealed to prevent MgB in the wires 2 The precursor powder was corroded by acid solution; then, the first MgB 2 Superconducting wire 1-1 and the second MgB 2 The superconducting wires 1-2 are all placed in a nitric acid solution for pickling treatment to remove the outer Cu cladding layer, and the HNO in the nitric acid solution 3 with H 2 The molar ratio of O is 1:1.6; after that, the first MgB after pickling treatment 2 The end to be connected of the superconducting wire 1-1 and the second MgB after pickling treatment 2 The ends to be connected of the superconducting wires 1-2 are ground into a slope shape, and the slope angle (the angle between the horizontal plane and the inclined p...

Embodiment 3

[0046] This example MgB 2 The connecting method of the superconducting wire comprises the following steps:

[0047] Step 1. First, the first MgB 2 The end to be connected of the superconducting wire 1-1 and the second MgB 2 The ends to be connected of the superconducting wires 1-2 are wax-sealed to prevent MgB in the wires 2 The precursor powder was corroded by acid solution; then, the first MgB 2 Superconducting wire 1-1 and the second MgB 2 The superconducting wires 1-2 are all placed in a nitric acid solution for pickling treatment to remove the outer Cu cladding layer, and the HNO in the nitric acid solution 3 with H 2 The molar ratio of O is 1:2; after that, the first MgB after pickling treatment 2 The end to be connected of the superconducting wire 1-1 and the second MgB after pickling treatment 2 The ends to be connected of the superconducting wires 1-2 are ground into a slope shape, and the slope angle (the angle between the horizontal plane and the inclined pla...

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PUM

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Abstract

The invention provides a connection method for MgB2 superconductive wire rods, and the method comprises the following steps: 1, carrying out the acid dipping of a first MgB2 superconductive wire rod and a second MgB2 superconductive wire rod, and enabling to-be-connected ends to be polished into the shape of a slope; 2, enabling the to-be-connected end face of the first MgB2 superconductive wire rod to be covered with Mg-B mixed powder in a laying manner, and then enabling the to-be-connected end face of the first MgB2 superconductive wire rod to be connected with the second MgB2 superconductive wire rod in a butt joint manner; 3, enabling Nb foil to wrap the first and second MgB2 superconductive wire rods after butt joint, then enabling a Cu pipe to sleeve the Nb foil, and obtaining a to-be-pressed product; 4, carrying out the pressing of the to-be-pressed product through an oil press, and obtaining a pressed product; 5, carrying out the sintering of the pressed product, and obtaining a connected MgB2 superconductive wire rod. According to the connected MgB2 superconductive wire rod, the resistance value of a connector of the connected MgB2 superconductive wire rod is less than 1*10<-10> ohm, and the superconductive connection performance is good.

Description

technical field [0001] The invention belongs to the technical field of superconducting material connection, in particular to a MgB 2 How to connect superconducting wires. Background technique [0002] Magnesium diboride (MgB 2 ) The superconductivity of the material was first discovered by Japanese scientists in 2001. The material is a non-metallic compound with a simple binary structure, and its superconducting critical transition temperature (T c ) is about 39K at zero field and is the highest known T c The simple binary compound is the material of choice for the application of medium and low field superconducting magnets in the liquid hydrogen temperature range, that is, around 20K. But similar to high temperature oxide superconducting materials, MgB 2 It is a brittle compound similar to ceramic properties, and its superconducting transmission performance can be irreversibly attenuated under the action of external forces such as bending, stretching, and torsion. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R43/00H01R4/68
Inventor 王庆阳闫果杨芳熊晓梅刘国庆冯建情李成山冯勇张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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