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High critical current density MgB2-base super conductor and producing method thereof

A current density, superconductor technology, applied in cable/conductor manufacturing, usage of superconductor elements, manufacturing/processing of superconductor devices, etc., can solve the problems of lack of effective pinning center, low critical current density, weak pinning of magnetic flux, etc. , to achieve improved magnetic flux pinning, high critical current density, and low-cost fabrication

Inactive Publication Date: 2006-08-02
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pure MgB 2 The irreversible field value of superconductor at 20K is only 4-5T, the main reason is that MgB 2 The absence of effective pinning centers in superconductors results in weak flux pinning, which leads to the MgB 2 The critical current density (Jc) of superconductors is low, which affects the MgB 2 Practical application of superconductors at high temperature (>20K) and high field (>4T)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] Mix dry magnesium (99%), boron (99%), zirconium (99%) and carbon (99%) powders thoroughly according to the ratio of atomic ratio Mg:Zr:B:C=0.95:0.05:1.95:0.05 2 Hour. The mixed powder is pressed into a block with a diameter of 20mm by a hydraulic press, and the applied pressure is 20MPa, then placed in a vacuum annealing furnace, and vacuumed at room temperature until the vacuum degree reaches 10 -3 Pa filled with pure argon or a mixture of argon and hydrogen, and then the wire was heated at a heating rate of not less than 60°C / min, kept at a temperature of 740°C for 10 hours, and finally at a temperature of not lower than 25°C / min. The minute cooling rate cools the sheet or block to room temperature, and the superconducting transition temperature is 38.6K, and the critical current density is 4.1×10 4 A / cm 2 (20K, 4T) MgB 2 base superconductor.

example 2

[0019] Dry magnesium (99%), boron (99%), zirconium (99%) and carbon (99%) powders were thoroughly mixed according to the ratio of atomic ratio Mg:Zr:B:C=0.9:0.1:1.9:0.11 Hour. The mixed powder is pressed into a sheet with a diameter of 20mm by a hydraulic press, and the applied pressure is 80MPa, then placed in a vacuum annealing furnace, and vacuumed at room temperature until the vacuum degree reaches 10 -3 Pa filled with pure argon or a mixture of argon and hydrogen, then heat the sheet or block at a heating rate not lower than 60°C / min, keep it at 760°C for 1 hour, and finally heat it at a temperature not lower than The wire is cooled to room temperature at a cooling rate of 25°C / min, and the superconducting transition temperature is 37.2K, and the critical current density is 5.2×10 4 A / cm 2 (20K, 4T) MgB 2 base superconductor.

example 3

[0021] The dry magnesium (99%), boron (99%), zirconium (99%) and carbon (99%) powders were thoroughly mixed according to the ratio of atomic ratio Mg:Zr:B:C=0.8:0.2:1.8:0.2 1.5 Hour. The mixed powder is pressed into a sheet with a diameter of 20mm by a hydraulic press, and the applied pressure is 60MPa, then placed in a vacuum annealing furnace, and vacuumed at room temperature until the vacuum degree reaches 10 -3Pa filled with pure argon or a mixture of argon and hydrogen, and then the wire was heated at a heating rate of not less than 60°C / min, kept at a temperature of 750°C for 6 hours, and finally at a temperature of not lower than 25°C / min. The minute cooling rate cools the sheet or block to room temperature, and the superconducting transition temperature is 35.3K, and the critical current density is 2.0×10 4 A / cm 2 (20K, 4T) MgB 2 base superconductor.

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Abstract

This invention relaters to a high critical current density superconductor of MgB2 base and its manufacturing method characterizing that C, Zr and other compounds are dispersed in said superconductor with MgB2 as the base, during the preparation, first of all, dried Mg, B, Zr and carbon powder in proportion are mixed fully for 1-2 hours to be formed then to be put in a vacuum annealing furnace to keep the temperature for 1-10 hours to be protected by Ar or mixed gas of Ar and H under 740-760deg.C to be cooled to room temperature to get a superconductor with MgB2 base of high critical current density.

Description

technical field [0001] The invention relates to a high critical current density MgB 2 based superconductors and methods for their preparation. Background technique [0002] Magnesium diboride (MgB) with a critical temperature of 39K in early 2001 2 ) The discovery of new superconductors has aroused widespread concern in the international academic community, because it created a new record for the transition temperature of intermetallic compound superconducting materials, which has very important academic value for theoretical research and applied research. Although MgB 2 The critical temperature of superconductors is only 39K, but unlike oxide high-temperature superconductors, MgB 2 It has a very simple chemical composition and crystal structure, the cost of the material is very low, the grain boundary can carry a high current, and its intrinsic critical current density (Jc) is very high (more than 10 7 A / cm 2 ). At the same time MgB 2 The coherence length of the oxid...

Claims

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Application Information

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IPC IPC(8): H01B12/00H01B13/00H01L39/12H01L39/24C01F5/00C01B35/04
CPCY02E40/64Y02E40/60
Inventor 闫果冯勇卢亚锋李成山纪平吴怡芳王庆阳
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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