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Preparation method for graphene-coated niobium-aluminium superconductive wire material

A graphene-coated, superconducting wire technology, applied in the use of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve problems such as reducing the reactivity of aluminum powder, and achieve large-scale production, Excellent performance and cost reduction effect

Inactive Publication Date: 2017-07-04
SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, how to control the oxidation of powder during the wire preparation process, especially the oxidation of nano-scale aluminum powder, has always existed. Because of its small size and relatively large area, nano-aluminum powder is very easy to absorb oxygen in the gas and generate oxidation on the surface of aluminum powder particles. Aluminum, which greatly reduces the reactivity of aluminum powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Put graphene oxide in ethanol, ultrasonically disperse to obtain graphene oxide solution, the power of the ultrasonic dispersion is 1200W, and the time of ultrasonic dispersion is 20min; then add spherical nano-aluminum powder to the graphene oxide solution, stir evenly and filter The filter residue is obtained, and the filter residue is vacuum-dried to obtain a mixed powder; the mass of the spherical nano-aluminum powder is 50 times the mass of graphene oxide; the concentration of the graphene oxide solution is 1 mg / mL.

[0015] The mixed powder is heat-treated in a reducing atmosphere, the temperature of the heat treatment is 500°C, and the heating rate is 20°C / min to obtain graphene-coated aluminum powder; the reducing atmosphere is a mixture of nitrogen and hydrogen Gas, the volume percentage of hydrogen in the mixed gas is 10%.

[0016] Take Nb powder with a purity of 99.999% and the above-mentioned graphene-coated aluminum powder, mix according to the ratio of Nb ...

Embodiment 2

[0019] Put graphene oxide in ethanol and ultrasonically disperse to obtain a graphene oxide solution. The power of the ultrasonic dispersion is 3000W, and the ultrasonic dispersion time is 40min; then add spherical nano-aluminum powder to the graphene oxide solution, stir well and filter The filter residue is obtained, and the filter residue is vacuum-dried to obtain a mixed powder; the mass of the spherical nano-aluminum powder is 80 times that of the graphene oxide; the concentration of the graphene oxide solution is 3 mg / mL.

[0020] The mixed powder is heat-treated in a reducing atmosphere, the temperature of the heat treatment is 800°C, and the heating rate is 50°C / min to obtain graphene-coated aluminum powder; the reducing atmosphere is a mixture of nitrogen and hydrogen Gas, the volume percentage of hydrogen in the mixed gas is 15%.

[0021] Take Nb powder with a purity of 99.999% and the above-mentioned graphene-coated aluminum powder, mix according to the ratio of Nb ...

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Abstract

The invention discloses a preparation method for a graphene-coated niobium-aluminium superconductive wire material. According to the preparation method, aluminum powder is added to a graphene oxide solution to realize singe-layer graphene-coated aluminum powder; the graphene after being subjected to heat treatment is free of agglomeration and can be tightly and uniformly combined with aluminum powder; graphene is on the interface of the prepared graphene-coated aluminium powder, so that oxidization of the aluminum powder is avoided; by virtue of the preparation method, the conditions that a precursor is cracked easily at a high temperature and special requirement on heating equipment is required in the conventional rapid-heating and rapid-cooling processing also can be avoided; and the obtained superconductive wire material is uniform in ingredients and excellent in performance, so that the cost is effectively lowered and large-scale production can be facilitated.

Description

technical field [0001] The invention relates to the field of superconducting materials, in particular to a method for preparing a graphene-coated niobium-aluminum superconducting wire. Background technique [0002] A superconducting material refers to a material that exhibits the properties of zero resistance and repelling magnetic lines of force under certain low temperature conditions. It has been found that 28 kinds of elements and thousands of alloys and compounds can become superconductors. The production technology of high-temperature superconducting materials has matured with the development of time, the price has also decreased, and the market competitiveness has continued to increase. It has the advantages of small size, light weight, low loss and large transmission capacity. It is an upgraded product of traditional cables. . [0003] Among practical superconducting materials, A15 type intermetallic compounds are the most common and rapid in development and applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B12/10
CPCH01B12/10H01B13/00Y02E40/60
Inventor 不公告发明人
Owner SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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