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A kind of connection method of mgb2 superconducting wire rod

A technology of superconducting wire and connection method, which is applied in the direction of connection, connection contact material, line/collector parts, etc., can solve problems that have not yet been discovered, and achieve the effect of promoting the practical process

Active Publication Date: 2018-04-10
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 obtain a resistance less than 1×10 -10 Ohm's research on superconducting joints has been reported

Method used

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  • A kind of connection method of mgb2 superconducting wire rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0031] Step 1. First, the first MgB 2 The terminal to be connected and the second MgB of superconducting wire 1-1 2 The ends to be connected of superconducting wires 1-2 are all wax-sealed to prevent MgB in the wires 2 The precursor powder is corroded by acid; then, the first MgB 2 Superconducting wire 1-1 and second MgB 2 The superconducting wires 1-2 are all placed in a nitric acid solution for pickling treatment to remove the outer Cu coating layer. 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 superconducting wire 1-1 and the second MgB after pickling treatment 2 The ends of the superconducting wires 1-2 to be connected are all ground into a slope shape, and the slope angle (the angle between the horizontal plane and the inclined surface) is 5°;

[0032] Step 2. First...

Embodiment 2

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

[0039] Step 1. First, the first MgB 2 The terminal to be connected and the second MgB of superconducting wire 1-1 2 The ends to be connected of superconducting wires 1-2 are all wax-sealed to prevent MgB in the wires 2 The precursor powder is corroded by acid; then, the first MgB 2 Superconducting wire 1-1 and second MgB 2 The superconducting wires 1-2 are all placed in a nitric acid solution for pickling treatment to remove the outer Cu coating layer. 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 superconducting wire 1-1 and the second MgB after pickling treatment 2 The ends of superconducting wires 1-2 to be connected are all ground into a slope shape, and the slope angle (the angle between the horizontal plane and the inclined surface) is 10°;

[0040] Step 2. First, m...

Embodiment 3

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

[0047] Step 1. First, the first MgB 2 The terminal to be connected and the second MgB of superconducting wire 1-1 2 The ends to be connected of superconducting wires 1-2 are all wax-sealed to prevent MgB in the wires 2 The precursor powder is corroded by acid; then, the first MgB 2 Superconducting wire 1-1 and second MgB 2 The superconducting wires 1-2 are all placed in a nitric acid solution for pickling treatment to remove the outer Cu coating layer. 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 superconducting wire 1-1 and the second MgB after pickling treatment 2 The ends of the superconducting wires 1-2 to be connected are all ground into a slope shape, and the slope angle (the angle between the horizontal plane and the inclined surface) is 15°;

[0048] Step 2. First,...

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Abstract

The invention provides a method for connecting MgB2 superconducting wires, comprising the following steps: 1. Pickling the first MgB2 superconducting wires and the second MgB2 superconducting wires, and grinding the ends to be connected into a slope shape 2. Cover the Mg-B mixed powder on the end face of the first MgB2 superconducting wire to be connected, and then dock with MgB2 superconducting wire 2; 3. Cover the first MgB2 superconducting wire after the docking with Nb foil outside the wire rod and the second MgB2 superconducting wire, and then put the Cu tube on the outside of the Nb foil to obtain a product to be pressed; 4. Use a hydraulic press to press the product to be pressed to obtain a pressed product; 5. Sinter the pressed product to obtain a connected product. After the MgB2 superconducting wire. The resistance of the connecting joint of the connected MgB2 superconducting wire of the present invention is less than 1×10-10 ohms, and has good superconducting connection performance.

Description

Technical field [0001] The invention belongs to the technical field of superconducting material connection, and specifically relates 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. Its superconducting critical transition temperature (T c ) Is about 39K at zero field, which is currently known to have the highest T c The simple binary compound is the first choice for medium and low field superconducting magnet applications in the liquid hydrogen temperature range, that is, about 20K. But similar to high-temperature oxide superconducting materials, MgB 2 It is a brittle compound similar to ceramic properties, which can cause irreversible attenuation of its superconducting transmission performance under external forces such as bending, stretching, and torsion. There...

Claims

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Application Information

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Patent Type & Authority Patents(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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