A connection method of second-generation high-temperature superconducting tape and superconducting wire

A technology of high-temperature superconducting strips and connecting methods, which is applied in the usage of superconducting elements, superconducting/high-conducting conductors, connecting, etc., can solve the problems of poor mechanical properties of superconducting joints, shorten the preparation time of joints, etc., and achieve the improvement of mechanical properties. Strength, shortening recovery time effect

Active Publication Date: 2021-12-07
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

The connection method provided by the invention realizes the superconducting layer connection without damaging the metal base band and provides a large range of oxygen diffusion channels to shorten the preparation time of the joint; at the same time, it overcomes the superconducting joint prepared purely by connecting the superconducting layer Defects with poor mechanical properties

Method used

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  • A connection method of second-generation high-temperature superconducting tape and superconducting wire
  • A connection method of second-generation high-temperature superconducting tape and superconducting wire
  • A connection method of second-generation high-temperature superconducting tape and superconducting wire

Examples

Experimental program
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Effect test

Embodiment 1

[0068] The connection method of the second-generation high-temperature superconducting strips comprises the following steps:

[0069] Use acetone to clean the oil stains on the surface of the area to be connected of two yttrium barium copper oxide (YBCO) superconducting strips, apply photoresist, and immerse in silver etchant after pre-baking, exposure, development, cleaning and post-baking Etch microgrooves with a width of 20 μm and an interval of 200 μm along the length of the superconducting tape and expose the underlying superconducting layer; after rinsing with deionized water, immerse in dilute phosphoric acid to etch the microgrooves of the superconducting layer to remove the striped microgrooves The remaining photoresist on the surface exposes the silver layer with striped microgrooves in the area to be connected, and then immerses in the silver etchant to remove the silver layer in this area, so that the superstructure with striped microgrooves underneath The conducti...

Embodiment 2

[0073] Superconducting wires are prepared in the same manner as in Example 1, except that the second-generation high-temperature superconducting tape is set to gadolinium barium copper oxide (GdBCO), and the etching width is set to 1 μm and 300 μm in microgrooves; the welding of the superconducting layer Conditions are set to vacuum to 5000Pa (P O2 About 1000Pa), apply a pressure of 50MPa, and raise the temperature of this area to 750°C and keep it for 120min; change the condition of oxidation annealing to an oxygen environment of 15MPa, and anneal at 600°C for 50h.

Embodiment 3

[0075] Superconducting wires were prepared in the same manner as in Example 1, except that the second-generation high-temperature superconducting tape was set to yttrium gadolinium barium copper oxide (YGdBCO), and the etching width was set to 50 μm with a microgroove interval of 500 μm; Welding conditions are set to fill with argon (P O2 About 0Pa), apply a pressure of 1MPa, and raise the temperature of the area to 950°C and keep it warm for 0.5min; change the conditions of oxidation annealing to an oxygen environment of 0.1MPa, and anneal at 400°C for 300h.

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Abstract

The invention provides a connection method and a superconducting wire of a second-generation high-temperature superconducting tape, and relates to the field of superconducting engineering. The connecting method of the present invention can not damage the metal base band, and can provide oxygen diffusion channels at the same time; the finally obtained joint has superconducting properties in the liquid nitrogen temperature region. Specifically, the invention provides a wide range of oxygen diffusion channels by etching striped microgrooves in the superconducting layer, and shortens the superconductivity recovery time; through the melting and diffusion of the superconducting layer, the interface between the two overlapping superconducting layers can be Part of the area is melted and interdiffused to be tightly connected as a whole to realize the connection between the superconducting layers, so that the joint has superconducting properties and form a superconducting joint.

Description

technical field [0001] The invention relates to the field of superconducting engineering, in particular to a connection method of second-generation high-temperature superconducting strips and a superconducting wire. Background technique [0002] The second-generation high-temperature superconducting material, that is, the second-generation high-temperature superconducting tape has excellent comprehensive properties and is widely used in strong electric fields such as strong magnetic fields. Many superconducting devices based on the second-generation high-temperature superconducting tape are also In continuous research and development. The preparation of these superconducting devices often requires very long superconducting strips, especially in the development of large and medium-sized magnets, the amount of superconducting strips may weigh several tons. However, due to the limitations of the process, the prepared superconducting tape cannot take into account the length and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B12/06H01B13/00H01R43/02
CPCH01B12/06H01B13/00H01B13/0016H01R43/0228Y02E40/60
Inventor 黄大兴丁发柱古宏伟商红静谢波玮李太广邹琪
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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