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Connecting method of second-generation high-temperature superconducting tape and connecting superconducting wire

A technology of high-temperature superconducting strips and connection methods, which is applied in the usage of superconductor elements, superconducting/high-conducting conductors, connections, etc., and can solve problems such as low connection strength and poor mechanical properties

Pending Publication Date: 2022-03-22
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

[0004] In order to achieve a non-resistance superconducting joint, it is necessary to directly connect the superconducting layer of the strip. In practical applications, the superconducting joint needs to bear certain tensile stress and bending deformation. However, the superconducting joint prepared by current technology is based on ceramic materials. The connection between the superconducting layers is very fragile, the connection strength is low, and the mechanical properties are poor, and further improvement is needed.

Method used

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  • Connecting method of second-generation high-temperature superconducting tape and connecting superconducting wire
  • Connecting method of second-generation high-temperature superconducting tape and connecting superconducting wire
  • Connecting method of second-generation high-temperature superconducting tape and connecting superconducting wire

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Embodiment 1

[0066] A method for connecting second-generation high-temperature superconducting strips, comprising the following steps:

[0067] a. Clean the oil on the surface of the area to be connected of two yttrium barium copper oxide (YBCO) superconducting strips with acetone, and then immerse the area to be connected in Silver Etchant TFS to remove the silver layer, exposing the YBCO superconducting strips below. Guide layer, wherein the removed silver layer is 4cm in length along the strip direction.

[0068] b. Plating a 50nm silver layer on the exposed YBCO superconducting layer in step a, and then annealing at 400° C. for 20 minutes to make the silver atoms diffuse and agglomerate into dispersed nano-silver particles.

[0069] c. After overlapping the exposed superconducting layers, apply a pressure of 20 MPa to the overlapping area under a vacuum atmosphere of 25 Pa, and raise the temperature of the overlapping area to 815°C and keep it warm for 20 minutes to form a joint in the...

Embodiment 2

[0073] A method for connecting second-generation high-temperature superconducting strips, comprising the following steps:

[0074] a. After cleaning the surface oil stains in the area to be connected of two yttrium barium copper oxide (YBCO) superconducting strips with acetone, the area to be connected is immersed in the silver etchant to remove the silver layer, and the YBCO superconducting layer below is exposed, Wherein the removed silver layer has a length of 2 cm along the strip direction.

[0075] b. Plating a 100nm silver layer on the exposed YBCO superconducting layer in step a, and then annealing at 600° C. for 40 minutes to make the silver atoms diffuse and agglomerate into dispersed nano-silver particles.

[0076] c. After overlapping the exposed superconducting layers, apply a pressure of 5 MPa to the overlapping area under a vacuum atmosphere of 50 Pa, and raise the temperature of the overlapping area to 800°C and keep it warm for 30 minutes to form a joint in the...

Embodiment 3

[0079] A method for connecting second-generation high-temperature superconducting strips, comprising the following steps:

[0080] a. After cleaning the surface oil stains in the area to be connected of two gadolinium barium copper oxide (GdBCO) superconducting strips with acetone, the area to be connected is immersed in the silver etchant to remove the silver layer, and the GdBCO superconducting layer below is exposed, Wherein the removed silver layer has a length of 1 cm along the strip direction.

[0081] b. Plating a 200nm silver layer on the exposed GdBCO superconducting layer in step a, and then annealing at 800°C to make the silver atoms diffuse and agglomerate into dispersed nano-silver particles.

[0082] c. After overlapping the exposed superconducting layers, apply a pressure of 50 MPa to the overlapping area under a vacuum atmosphere of 5 Pa, and raise the temperature of the overlapping area to 850 ° C and keep it warm for 1 min to form a joint in the overlapping a...

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Abstract

The invention provides a connecting method of a second-generation high-temperature superconducting tape and a connecting superconducting wire. According to the invention, the dispersed silver nanoparticles are formed on the surface of the exposed superconducting layer, the gaps are formed around the dispersed silver nanoparticles, and a large number of rapid oxygen diffusion channels can be provided on the premise of not damaging the structural integrity of the superconducting layer by matching with the relatively high oxygen diffusion coefficient of silver, so that the recovery of the superconducting performance of the connector is facilitated; the connecting joint is formed in a melt diffusion welding mode, and in the melt diffusion welding process, the superconducting layer at the joint loses superconductivity; under the oxygen-containing condition, the connector is subjected to heat treatment, and in the heat treatment process, the superconducting layer is oxygenated, so that the oxygen content of the components of the superconducting layer is increased, and the superconductivity of the superconducting layer is recovered. Meanwhile, the silver becomes soft at a high temperature and has the characteristic of viscosity, and the silver nanoparticles are used as an adhesive, so that the connection strength of the superconducting layer interface can be improved.

Description

technical field [0001] The invention relates to the technical field of superconducting materials, in particular to a method for connecting second-generation high-temperature superconducting strips and connecting superconducting wires. Background technique [0002] The second generation high temperature superconducting material REBa 2 Cu 3 o 7-x (REBCO, RE is Y, Gd and other rare earth elements) has excellent comprehensive properties (irreversible field reaches 7T at 77K, critical current density under self-field reaches 106A / cm 2 ), which can fully meet the application in the field of strong electricity in the liquid nitrogen temperature zone and strong magnetic field, and greatly promote the practical application of superconducting power technology. [0003] In recent years, the performance of the second-generation high-temperature superconducting strips based on REBCO materials has also been continuously improved, and is currently in the initial stage of practical appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R43/02H01R4/68H01B12/02
CPCH01R43/02H01R4/68H01B12/02Y02E40/60
Inventor 黄大兴丁发柱古宏伟董浩王锴
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI