A preparation method of graphene-supported multi-component doped magnesium diboride superconducting bulk material

A magnesium diboride and graphene technology is applied in the field of high-temperature superconducting material preparation, which can solve the problems of uneven distribution of inorganic doping sources, reducing the connectivity between crystal grains, changing the phase composition of materials, and the like, achieving a simple preparation method, The effect of improving superconductivity and reducing phase formation temperature

Active Publication Date: 2017-05-10
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when inorganic carbon and titanium compounds are used as doping sources, due to their low activity and poor dispersion, high heat treatment temperature is required to introduce effective doping, and the distribution of inorganic doping sources is not uniform, and it is easy to agglomerate at the grain boundary. At the place, the connection between the grains is reduced, and the high temperature will cause the volatilization of Mg, changing the phase composition of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of the graphene-loaded multi-component doped magnesium diboride superconducting bulk material of this embodiment comprises the following steps:

[0022] Step 1, dissolving graphene oxide in a mixed solution of ethanol and water to obtain a graphene oxide solution; then adding ethyl silicate and ethyl titanate dropwise to the graphene oxide solution, stirring evenly to obtain a mixed material; The volume ratio of ethanol and water in the mixed solution is 0.5:1, and the concentration of the graphene oxide solution is 0.01mg / mL; 1 times the mass of graphene;

[0023] Step 2. The mixed material described in step 1 is subjected to a hydrothermal reaction at a temperature of 50°C. After the reaction is completed, the filter residue is obtained by filtration, and the filter residue is washed and vacuum-dried to obtain a graphene-loaded multi-component mixed powder; The time of said hydrothermal reaction is 3h;

[0024] Step 3, heat-treating the graphe...

Embodiment 2

[0029] The preparation method of the graphene-loaded multi-component doped magnesium diboride superconducting bulk material of this embodiment comprises the following steps:

[0030] Step 1, dissolving graphene oxide in a mixed solution of ethanol and water to obtain a graphene oxide solution; then adding ethyl silicate and ethyl titanate dropwise to the graphene oxide solution, stirring evenly to obtain a mixed material; The volume ratio of ethanol and water in the mixed solution is 5:1, and the concentration of graphene oxide solution is 10mg / mL; The quality of titanium element in the described mixed material is 6 times of graphene oxide quality, and the quality of silicon element is graphite oxide 3 times the mass of alkenes;

[0031] Step 2. The mixed material described in step 1 is subjected to a hydrothermal reaction at a temperature of 150°C. After the reaction is completed, the filter residue is obtained by filtration, and the filter residue is washed and vacuum-dried ...

Embodiment 3

[0037] The preparation method of the graphene-loaded multi-component doped magnesium diboride superconducting bulk material of this embodiment comprises the following steps:

[0038] Step 1, dissolving graphene oxide in a mixed solution of ethanol and water to obtain a graphene oxide solution; then adding ethyl silicate and ethyl titanate dropwise to the graphene oxide solution, stirring evenly to obtain a mixed material; The volume ratio of ethanol and water in the mixed solution is 2:1, and the concentration of graphene oxide solution is 5mg / mL; The quality of titanium element in the described mixed material is 4 times of graphene oxide quality, and the quality of silicon element is graphite oxide 2 times the mass of alkenes;

[0039]Step 2. The mixed material described in step 1 is subjected to a hydrothermal reaction at a temperature of 100°C. After the reaction is completed, the filter residue is obtained by filtration, and the filter residue is washed and vacuum-dried to...

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Abstract

The invention discloses a preparation method for a graphene-loaded multielement-doped magnesium diboride superconducting bulk material. The preparation method comprises the steps of 1, dropwise adding ethyl silicate and titanium ethoxide into a graphene oxide solution, and stirring uniformly to obtain a mixture material; 2, performing a hydrothermal reaction, filtering and washing and then carrying out vacuum drying to obtain graphene-loaded multielement mixture powder; 3, performing heat treatment to obtain graphene-loaded multielement-doped powder; 4, mixing boron powder and magnesium powder and grinding, then adding the mixture powder to the graphene-loaded multielement-doped powder, uniformly grinding and pressing and shaping to obtain a bulk material; and 5, performing sintering on the bulk material under protection of an inert atmosphere, and performing furnace cooling to the room temperature to obtain the graphene-loaded multielement-doped magnesium diboride superconducting bulk material. The preparation method is simple; the prepared multielement dopant is uniform in dispersion, free of agglomeration, high in activity and can rapidly enter magnesium diboride lattices, thereby reducing the phase-forming temperature of the doped magnesium diboride; and in addition, the prepared magnesium diboride bulk material has excellent performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-temperature superconducting materials, and in particular relates to a method for preparing graphene-supported multi-component doped magnesium diboride superconducting bulk materials. Background technique [0002] With the "climate warming" of the earth and the deterioration of the human living environment, the development of energy-saving, environmental protection and new energy technologies has become an inevitable choice for human beings in the 21st century; and superconducting materials, as the most important high-tech energy-saving and environmental protection materials in the 21st century, are used in large-scale transportation. It has a wide range of applications in power distribution, super magnets, energy storage, generators, transformers, maglev trains and other fields. Magnesium diboride superconducting materials have the advantages of high critical temperature (Tc=39K), larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00H01B12/00
CPCH01B12/00H01B13/00Y02E40/60
Inventor 金利华王耀刘国庆熊晓梅王庆阳杨芳李成山冯建情张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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