A method for making superconducting joints for rare earth barium copper oxide high temperature superconducting wires

A technology of rare earth barium copper oxide and superconducting joints, which is applied in the direction of superconducting/high-conducting conductors, the usage of superconducting elements, conductive connections, etc., can solve the problems of unfavorable industrial production, long time-consuming, high cost, etc., and achieve shortened production time, The effect of reducing production cost and low cost

Active Publication Date: 2019-03-01
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The critical current of the joint can reach the level of the initial wire, however, the process uses oxygenation for up to 350 hours and requires intensive laser drilling, so the method is time-consuming, expensive and not conducive to high-volume industrial production

Method used

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  • A method for making superconducting joints for rare earth barium copper oxide high temperature superconducting wires
  • A method for making superconducting joints for rare earth barium copper oxide high temperature superconducting wires
  • A method for making superconducting joints for rare earth barium copper oxide high temperature superconducting wires

Examples

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Effect test

Embodiment 1

[0045] A method for manufacturing a superconducting joint for a rare earth barium copper oxide high temperature superconducting wire, comprising the following steps:

[0046] (S1) corroding the silver stabilizing layers at the ends of the two superconducting wires to expose the superconducting layers;

[0047] (S2) mixing rare earth barium copper oxide powder and silver powder as auxiliary agent, as powder solder;

[0048] (S3) placing the superconducting layers of the two wires facing each other, and adding powdered solder in the middle;

[0049] (S4) pressurize and fix the two wires with powdered solder added in the middle;

[0050] (S5) performing heat treatment under low oxygen partial pressure to locally melt the powdered solder, and then generate a rare-earth barium-copper-oxygen phase in an oxygen-deficient state, and the phase grows epitaxially on the surface of the superconducting layer to connect the two superconducting layers;

[0051] (S6) Oxygenation heat treatm...

Embodiment 2

[0061] A method for manufacturing a superconducting joint for a rare earth barium copper oxide high temperature superconducting wire, comprising the following steps:

[0062] (S1) corroding the silver stable layers at the ends of the two superconducting wires to expose the superconducting layers;

[0063] (S2) mixing yttrium oxide powder, barium carbonate (or barium oxide) powder, copper oxide powder and KOH powder as auxiliary agent to obtain powder solder;

[0064] (S3) placing the superconducting layers of the two wires facing each other, and adding powdered solder in the middle;

[0065] (S4) pressurize and fix the two wires with powdered solder added in the middle;

[0066] (S5) performing heat treatment under low oxygen partial pressure to cause the powder solder to react, and the oxygen-deficient rare earth barium copper oxide phase grows epitaxially on the surface of the superconducting layer to connect the two superconducting layers;

[0067] (S6) Oxygenation heat t...

Embodiment 3

[0072] An epitaxial growth joint technology applied to the welding of two rare-earth barium-copper-oxygen high-temperature superconducting wires in a non-parallel position relationship. The operation steps of this embodiment are basically the same as those of Embodiment 1, only in step S2, according to the needs of coil winding , while placing the two wires face to face, using a certain angle θ, such as Figure 4 shown.

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Abstract

The invention discloses a method for manufacturing a superconducting connector of rare-earth-barium-copper-oxygen high-temperature superconducting wires. The method comprises the following steps of: a, removing silver layers at end parts of two superconducting wires to expose superconducting layers; b, arranging the superconducting layers of the two superconducting wires in a face-to-face manner, and adding solder powder capable of generating a rare-earth-barium-copper-oxygen phase in a heat treatment process during intermediate operation; c, performing heat treatment under a proper low oxygen partial pressure to enable the solder powder to perform a reaction, and enabling a hypoxia-state rare-earth-barium-copper-oxygen phase to epitaxially grow on the surfaces of the superconducting layers so as to connect the two superconducting layers; and d, performing oxygenation heat treatment under a proper high oxygen partial pressure to endow the rare-earth-barium-copper-oxygen phase with a superconducting performance so as to realize a superconducting connection between the two superconducting wires. According to the method, a manufacturing process can be simplified, the production time can be shortened, the production cost can be reduced, and the superconducting connection of strips is realized on the premise of not damaging metal strips as far as possible.

Description

technical field [0001] The invention relates to high-temperature superconducting wire technology, in particular to a method for manufacturing a superconducting joint used for rare-earth barium-copper-oxygen high-temperature superconducting wires. Background technique [0002] When winding magnet coils with superconducting wires, the joints play the role of connecting wires, and their performance directly affects the overall electrical properties of the coils. The welding processing technology of superconducting joints without resistance is very important. Superconducting coils using this technology can be applied to magnets operating in closed loops, which is a technology that must be overcome for high-field steady-state magnets. The overall superconducting coil can realize the constant current mode (Permanent Current Mode, referred to as PCM), the current in the coil can be kept constant for a long time without loss, and no external power supply is needed. In magnetic reso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01R43/02H01R4/02H01R4/68H01B12/06
CPCH01B12/06H01R4/021H01R4/68H01R43/02H01R2201/22Y02E40/60
Inventor 冯峰瞿体明朱宇平卢弘愿张向松符其树韩征和
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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