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Preparation method for MgB2 based composite element doped cryogenic conductor

A technology of element doping and superconductor, which is applied in the field of preparation of MgB2-based composite element doped superconductor, can solve the problems of increasing material cost and achieve low-cost preparation, improved magnetic flux pinning, and high critical current density.

Active Publication Date: 2009-01-14
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, these two methods need to use expensive nano-scale Ti powder and SiC powder as raw materials, which increases the cost of materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Dried magnesium (99%), boron (99%), Ti 3 SiC 2 (95%) powder according to molar ratio Mg:B:Ti 3 SiC 2 = 1 - 0.3x:2 - 0.5x: x ratio mixed well for 1 hour, where x = 0.05. The mixed powder is pressed into a sheet or 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 After Pa is filled with pure argon or a mixture of argon and hydrogen, the volume percentage of argon and hydrogen is 24:1, and then the sheet or block is heated at a heating rate of 70°C / min, and kept at 700°C for 2 hours , and finally cool the sheet or block to room temperature at a cooling rate of 30°C / min to make a superconducting transition temperature of 38K and a critical current density of 6.5x10 4 A / cm 2 (20K, 3T) MgB 2 base superconductor.

Embodiment 2

[0018] Dried magnesium (99%), boron (99%), Ti 3 SiC 2 (95%) powder according to molar ratio Mg:B:Ti 3 SiC 2 = 1-0.3x:2-0.5x:x ratio mixed well for 2 hours, where x = 0.1. The mixed powder is pressed into a sheet or block 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 After Pa is filled with pure argon or a mixture of argon and hydrogen, the volume percentage of argon and hydrogen is 24:1, and then the sheet or block is heated at a heating rate of 80°C / min, and kept at 800°C for 2 hours , and finally cool the sheet or block to room temperature at a cooling rate of 35°C / min to make a superconducting transition temperature of 37.5K and a critical current density of 5.8x10 4 A / cm 2 (20K, 3T) MgB 2 base superconductor.

Embodiment 3

[0020] Dried magnesium (99%), boron (99%), Ti 3 SiC 2 (95%) powder according to molar ratio Mg:B:Ti 3 SiC 2 = 1-0.3x:2-0.5x:x ratio mixed well for 2 hours, where x = 0.2. The mixed powder is pressed into a sheet or block with a diameter of 20mm by a hydraulic press, and the applied pressure is 40MPa, then placed in a vacuum annealing furnace, and vacuumed at room temperature until the vacuum degree reaches 10 -3 After Pa is filled with pure argon or a mixture of argon and hydrogen, the volume percentage of argon and hydrogen is 24:1, and then the sheet or block is heated at a heating rate of 80°C / min, and kept at 900°C for 2 hours , and finally cool the sheet or block to room temperature at a cooling rate not lower than 40°C / min, and then the superconducting transition temperature is 37K, and the critical current density is 5.2x10 4 A / cm 2 (20K, 3T) MgB 2 base superconductor.

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Abstract

The invention provides a preparation method of an MgB2 matrix composite element doped superconductor, and the preparation process comprises: firstly mixing dried magnesium powder, boron powder and Ti3SiC2 powder fully according to a certain proportion for 1 to 2 hours, and molding the mixed powder by compression; then putting the mixture into a vacuum annealing furnace, and preserving the heat of the furnace for 1 to 10 hours at a temperature of between 700DEG C and 1000DEG C under the protection of a gas mixture of pure argon gas or argon gas and hydrogen; and finally cooling the mixture to the room temperature, so as to prepare the MgB2 matrix composite element doped superconductor with high critical current density. The adoption of the MgB2 matrix superconductor prepared by the preparation method can introduce the second phase particle as an effective pinning center while changing the crystal structure of the MgB2 matrix superconductor, and the acquired MgB2 matrix superconductor has high critical current density in the background magnetic field of over 3-Tesla, and can realize the low-cost preparation of the MgB2 matrix superconductive material, and effectively improve the flux pinning of the MgB2 matrix superconductor.

Description

technical field [0001] The invention relates to a preparation method of a superconductor, in particular to a MgB 2 Preparation method of compound element-doped superconductor. Background technique [0002] 2001MgB 2 After the discovery of the superconductivity of MgB, the international superconducting community quickly paid attention to the MgB 2 reached a consensus on the application prospects. MgB 2 The application can be realized in the working temperature range of the refrigerator (20K-30K), without complex and expensive liquid helium conditions. Low-temperature superconductors cannot work in this temperature range. Combined refrigeration cost and material cost, MgB 2 The application of superconductors in the range of 20-30K, 1-3T magnetic field has obvious technical advantages. [0003] But MgB 2 The practical application of superconductors must solve a key problem, that is, to improve the MgB 2 Flux pinning in superconductors. MgB 2 It is a typical type II s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58H01B12/00
CPCY02E40/64Y02E40/60
Inventor 闫果刘国庆王庆阳熊晓梅李成山
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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