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Superconducting wire and its preparation method

A superconducting wire, superconducting technology, applied in superconducting/high-conducting conductor, usage of superconducting element, superconducting device, etc. The effect of improving welding performance, adding special functions, and improving protective ability

Inactive Publication Date: 2003-12-10
INNOVA SUPERCONDUCTOR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silver or silver alloys are easily corroded by sulfur vapor or hydrogen sulfide in humid air, forming silver sulfide and making the surface black
Moisture, carbon dioxide or other harmful gases in the air may penetrate into the superconducting core through the microcracks of the silver or silver alloy sheath, and chemically react with the superconducting material, resulting in a decrease in the performance of the wire
When the wire is soaked in liquid nitrogen for a long time, liquid nitrogen may also infiltrate into the superconducting core through the microcracks of the silver or silver alloy sheath, and if the wire is subsequently subjected to decompression or heating, the liquid nitrogen will turn into a gas , increasing the volume of the superconducting core, forming bubbles in the wire, resulting in a significant decrease in the critical current of the superconducting wire, which may seriously affect the performance of the superconducting device
The surface of the general silver or silver alloy sheath is easy to form oxides and is not easy to weld

Method used

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  • Superconducting wire and its preparation method
  • Superconducting wire and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 palladium plating

[0024] like figure 1 As shown, according to the metal casing method, the superconducting powder is put into the silver casing and subjected to drawing, rolling and heat treatment, and the engineering critical current density is 8000A / cm 2 (77K, self-field) superconducting wire, and then use a 300-mesh emery cloth wheel to grind the surface of the wire. The diameter of the emery cloth wheel is 60mm, and the speed is 10000 rpm. The rotation speed is 20000 rpm, then use acetone to degrease the surface of the wire, and then wash it with cold and hot water, and then use sulfuric acid with a concentration of 16mL / L to carry out weak corrosion at room temperature for 5 seconds, and then use chlorine The palladium chloride solution electroplates a layer of palladium on the surface of the wire. The content of the palladium chloride solution in the electrolyte is 3.7g / L, the content of disodium hydrogen phosphate is 100g / L, the content of diammon...

Embodiment 2

[0025] Example 2 Tin plating

[0026] According to the metal casing method, the superconducting powder is put into the silver casing and subjected to drawing, rolling and heat treatment, and the engineering critical current density is 7000A / cm 2 (77K, self-field) superconducting wire, and then use a 300-mesh emery cloth wheel to grind the surface of the wire. The diameter of the emery cloth wheel is 60mm, and the speed is 10000 rpm. The rotating speed is 36000 rpm, then use alcohol to remove oil, and then use sulfuric acid with a concentration of 20mL / L to weakly corrode at room temperature for 4 seconds, then wash with warm water and cold water in turn, and then electroplate tin, the electrolyte is 70g / L stannous sulfate, 160g / L sulfuric acid and 40g / L brightener, and finally wash with warm water and dry. In this way, a layer of tin film is obtained on the surface of the wire, which can effectively enhance the oxidation resistance, penetration resistance, mechanical strengt...

Embodiment 3

[0027] Example 3 Tin and Epoxy

[0028] According to the metal casing method, the superconducting powder is put into the silver casing and subjected to drawing, rolling and heat treatment, and the engineering critical current density is 8000A / cm 2 (77K, self-field) superconducting wire, and then use a 300-mesh emery cloth wheel to grind the surface of the wire. The diameter of the emery cloth wheel is 60mm, and the speed is 10000 rpm. The rotating speed is 36000 rpm, then use alcohol to remove oil, and then use sulfuric acid with a concentration of 20mL / L to weakly corrode at room temperature for 4 seconds, then wash with warm water and cold water in turn, and then electroplate tin, the electrolyte is 70g / L stannous sulfate, 160g / L sulfuric acid and 40g / L brightener, and finally wash with warm water and dry. The prepared wire was then dip-coated in an organic epoxy resin solution, and cured in air at 240° C. for 5 minutes, thereby forming a resin layer on the superconducting...

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Abstract

The present invention relates to a high-temp. superconducting conducting wire and its preparation method. It contains superconducting core and silver or silver alloy base body for covering said superconducting core, and the exterior of said base body also is coated with a layer or several layers of covering layer so as to raise its protective capacity.

Description

technical field [0001] The invention relates to a superconducting wire, in particular to a high-temperature superconducting wire and a preparation method thereof. By using the method, various covering layers can be added on the surface of the superconducting wire to improve the protection ability of the wire, and to make the surface of these wires have Various suitable physical and chemical properties. Background technique [0002] The development of superconducting wires, especially bismuth-based high-temperature superconducting wires, has made great progress so far. A typical high-temperature superconducting wire is prepared by the metal sheath method. In this method, silver or silver alloy is generally used as the matrix of the superconducting wire, and the superconducting material is packed into the silver or silver alloy sleeve to compensate for the brittleness of the superconducting material, improve the softness of the superconducting wire, and protect the supercondu...

Claims

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Application Information

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IPC IPC(8): H01B12/04H01B13/00
CPCY02E40/641Y02E40/60
Inventor 韩征和
Owner INNOVA SUPERCONDUCTOR TECH
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