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A low-resistance connection method for rare earth barium copper oxide superconducting tape

A technology of rare earth barium copper oxide and superconducting tape, which is applied in the direction of connection, connection contact material, line/collector parts, etc., can solve the problems of long welding time, complicated process, increased difficulty and cost, etc., and achieve the connection Low cost, simple operation, and the effect of improving welding quality

Active Publication Date: 2022-03-18
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silver layer diffusion welding process is more complicated, the welding time is relatively long (usually greater than 1h), and the atmosphere protection is required, which greatly increases the difficulty and cost of practical application

Method used

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  • A low-resistance connection method for rare earth barium copper oxide superconducting tape
  • A low-resistance connection method for rare earth barium copper oxide superconducting tape
  • A low-resistance connection method for rare earth barium copper oxide superconducting tape

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Figure 1-Figure 2 It is shown that a specific embodiment of the present invention is a low-resistance connection method for rare earth barium copper oxide superconducting strips, the steps of which are:

[0030] A. Pretreatment: Delineate the joint area at the ends of the two strips close to the superconducting layer, and apply nano-silver paste on the joint area through the screen printing plate of the screen printing machine; The joint area of ​​the strip is laminated and overlapped to form a weakly connected pre-joint; the strip is a rare earth barium copper oxide superconducting strip with a metal protective layer and only a silver layer;

[0031] Wherein, the starting point of the joint area is the end of the strip, the length is 100 mm, and the width is the same as that of the strip, which is 4 mm.

[0032] Wherein, the specific way of coating nano-silver paste is:

[0033] A1. Wipe the joint area with silver washing water to remove oxides on the surface of the...

Embodiment 2

[0040] A low-resistance connection method for rare-earth barium-copper-oxygen superconducting strips, the steps of which are:

[0041] A. Pretreatment: Delineate the joint area at the ends of the two strips close to the superconducting layer, and apply nano-silver paste on the joint area through the screen printing plate of the screen printing machine; The joint area of ​​the strip is laminated and overlapped to form a weakly connected pre-joint; the strip is a rare earth barium copper oxide superconducting strip with a metal protective layer and only a silver layer;

[0042] Wherein, the starting point of the joint area is the end of the strip, the length is 20 mm, and the width is the same as that of the strip, which is 4 mm.

[0043] Wherein, the specific way of coating nano-silver paste is:

[0044] A1. Wipe the joint area with silver washing water to remove oxides on the surface of the joint area; then use absolute ethanol to clean the remaining silver washing water and ot...

Embodiment 3

[0051] A low-resistance connection method for rare-earth barium-copper-oxygen superconducting strips, the steps of which are:

[0052] A. Pretreatment: Delineate the joint area at the ends of the two strips close to the superconducting layer, and apply nano-silver paste on the joint area through the screen printing plate of the screen printing machine; The joint area of ​​the strip is laminated and overlapped to form a weakly connected pre-joint; the strip is a rare earth barium copper oxide superconducting strip with a metal protective layer and only a silver layer;

[0053] Wherein, the starting point of the joint area is the end of the strip, the length is 10 mm, and the width is the same as that of the strip, which is 4 mm.

[0054] Wherein, the specific way of coating nano-silver paste is:

[0055] A1. Wipe the joint area with silver washing water to remove oxides on the surface of the joint area; then use absolute ethanol to clean the remaining silver washing water and ...

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Abstract

A low-resistance connection method for rare earth barium copper oxide superconducting strips, the steps are mainly: A, pretreatment: demarcate the joint area at the end of two strips near the superconducting layer side, and pass through the screen printing plate Apply nano-silver paste on the joint area; then overlap the joint areas of the two superconducting silver strips with only the silver layer as the metal protection layer to form a pre-joint; then heat and dry the pre-joint to form an intervening joint; B, welding : Heat the joint fixture to 150-200°C at a heating rate of 1-5°C / min, and keep it warm for 15-40min; then place the intervention joint in the joint fixture, apply a pressure of 10-40MPa to the intervention joint through the joint fixture, and keep warm Press for 5-30min to form a welded joint; C. Encapsulation: Coating a Cu metal layer on the outer surface of the welded joint and the two strips, that is, to realize the connection of the strips. The method is simple in operation and high in efficiency, and the obtained strips have low joint resistance and good mechanical properties.

Description

technical field [0001] The invention relates to a connection method of rare earth barium copper oxide superconducting strips. Background technique [0002] Rare earth barium copper oxide (REBCO) high-temperature superconducting tapes have high critical current density and irreversible field in the liquid nitrogen temperature region, and have broad application prospects in superconducting power transmission and superconducting energy storage. The structure of REBCO high-temperature superconducting tape is: the base layer, at least one buffer layer grown on the base layer and the superconducting layer grown on the buffer layer constitute the main body of the tape; the outer surface of the main body of the tape is first wrapped with a silver layer, and then wrapped The copper layer constitutes the metal protection layer. Such a complex layered structure of REBCO high-temperature superconducting tape makes it very difficult to directly prepare long tapes (long tapes) with high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01R43/02H01R4/68
CPCH01R43/02H01R4/68
Inventor 王文涛刘连赵勇郑秋瞳
Owner SOUTHWEST JIAOTONG UNIV
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