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Magnesium diffusion preparation method for graphene-doped multicore MgB2 superconducting wire material

A technology of superconducting wires and graphene, which is applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve problems such as immaturity, and achieve improved density, enhanced connectivity, and superconductivity. The effect of high phase filling ratio

Inactive Publication Date: 2018-08-21
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this method is that after the central magnesium rod diffuses into the boron layer, holes will be formed in the original center of the magnesium rod. 2 Wire is still immature

Method used

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  • Magnesium diffusion preparation method for graphene-doped multicore MgB2 superconducting wire material
  • Magnesium diffusion preparation method for graphene-doped multicore MgB2 superconducting wire material
  • Magnesium diffusion preparation method for graphene-doped multicore MgB2 superconducting wire material

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Experimental program
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Effect test

Embodiment 1

[0031] This embodiment includes the following steps:

[0032] Step 1. Mix the amorphous boron powder and graphene powder evenly in an argon-protected glove box, and then put them into an agate mortar for grinding to obtain a mixed powder; the mass purity of the amorphous boron powder is 99.8%. The diameter is 0.2 μm, the mass purity of the graphene powder is 99%, and the molar ratio of the amorphous boron powder and the graphene powder is 1.97:0.03;

[0033] Step 2, sanding the magnesium rod, scrubbing with ethanol and drying in sequence, then loading the center of the niobium tube after pickling, and then filling the mixed powder obtained in step 1 into the pores of the magnesium rod and the niobium tube to obtain The first tube-packing complex; the diameter of the magnesium rod is 3.0mm, and the quality purity of the magnesium rod is 99.9%; the outer diameter of the niobium tube is 8mm, and the wall thickness of the niobium tube is 1mm; the concrete of the pickling The proc...

Embodiment 2

[0050] This embodiment includes the following steps:

[0051] Step 1. Mix the amorphous boron powder and graphene powder evenly in an argon-protected glove box, and then put them into an agate mortar for grinding to obtain a mixed powder; the mass purity of the amorphous boron powder is 99%. The diameter is 0.1 μm, the mass purity of the graphene powder is 99%, and the molar ratio of the amorphous boron powder and the graphene powder is 1.92:0.08;

[0052] Step 2, sanding the magnesium rod, scrubbing with ethanol and drying in sequence, then loading the center of the niobium tube after pickling, and then filling the mixed powder obtained in step 1 into the pores of the magnesium rod and the niobium tube to obtain The first tube-loading complex; the diameter of the magnesium rod is 4.0mm, and the quality purity of the magnesium rod is 99.99%; the outer diameter of the niobium tube is 12mm, and the wall thickness of the niobium tube is 2mm; the concrete of the pickling The proc...

Embodiment 3

[0058] This embodiment includes the following steps:

[0059] Step 1. Mix the amorphous boron powder and graphene powder evenly in an argon-protected glove box, and then put them into an agate mortar for grinding to obtain a mixed powder; the mass purity of the amorphous boron powder is 99.9%. The diameter is 10 μm, the mass purity of the graphene powder is 99.3%, and the molar ratio of the amorphous boron powder and the graphene powder is 1.95:0.05;

[0060] Step 2, sanding the magnesium rod, scrubbing with ethanol and drying in sequence, then loading the center of the niobium tube after pickling, and then filling the mixed powder obtained in step 1 into the pores of the magnesium rod and the niobium tube to obtain The first tube-loading complex; the diameter of the magnesium rod is 3.5mm, and the quality purity of the magnesium rod is 99.95%; the outer diameter of the niobium tube is 10mm, and the wall thickness of the niobium tube is 1.5mm; the pickled The specific process...

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Abstract

The invention discloses a magnesium diffusion preparation method for a graphene-doped multicore MgB2 superconducting wire material. The method comprises the steps that 1, amorphous boron powder and graphene powder are mixed and ground to obtain mixed powder; 2, a magnesium rod is placed in the center of a niobium tube, and then hole gaps between the magnesium rod and the niobium tube are filled with the mixed powder to obtain a first tubing complex; 3, the first tubing complex is subjected to rotary swaging to obtain a single-core wire material; 4, the single-core wire material and a CuNb rodare assembled in a Monel tube to obtain a second tubing complex; 5, the second tubing complex is subjected to rotary swaging and drawing to obtain the multicore wire material; 6, the multicore wire material is subjected to vacuum sintering to obtain the multicore MgB2 superconducting wire material. According to the method, the multicore wire material is prepared in combination with a graphene-doped and center magnesium diffusion method, graphene is evenly doped in an MgB2 layer, the compactness and critical current density of an MgB2 superconducting core wire are effectively increased, and themechanical performance of the MgB2 superconducting wire material is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of superconducting materials, in particular to a graphene-doped multi-core MgB 2 Magnesium diffusion preparation method of superconducting wire. Background technique [0002] MgB 2 Since the superconductor was discovered in 2001, due to its critical temperature of 39K, its advantages such as large coherence length and no weak grain boundary connection, it has attracted much attention from scientists at home and abroad. However, MgB 2 Lacking an effective flux pinning center, its critical current density J c Decays rapidly under magnetic field. After more than ten years of extensive and systematic research, it was found that element doping can improve the MgB 2 Wire under magnetic field J c The most efficient method in which graphene doping can significantly refine the MgB 2 grains and improve grain connectivity, thereby increasing the MgB 2 The critical current density (J c ), to obtai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/00H01B13/00
CPCH01B12/00H01B13/00Y02E40/60
Inventor 杨芳刘浩然王庆阳熊晓梅闫果冯勇冯建情李成山金利华
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH