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Preparation method of MgB2 superconductor

A superconductor and preparation process technology, applied in the usage of superconductor elements, manufacture/processing of superconductor devices, superconducting/high-conducting conductors, etc., can solve the problems of unusable and high cost, and achieve the purpose of increasing density and refining MgB2 crystals Granules, the effect of strengthening the connection

Active Publication Date: 2006-06-28
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, the high-pressure method has high cost and cannot be used in MgB 2 Disadvantages of use in the preparation of superconducting wires

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] Dry magnesium (99%) and boron (99%) powders were thoroughly mixed for 1 hour according to the ratio of atomic ratio Mg:B=1:4. The mixed powder is pressed into a sheet 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 is filled with pure argon or a mixture of argon and hydrogen, and then the sheet or block is heated at a heating rate of 60°C / min, kept at a temperature of 650°C for 2 hours, and finally cooled at a rate of 25°C / min. Slices or pieces are cooled to room temperature. Then the flakes or blocks are crushed into a powder with a particle size of 10-15 microns, and metal magnesium powder is added thereto to obtain a mixed powder with an atomic ratio of magnesium and boron of 1:2. The mixed powder is pressed into a sheet with a diameter of 20mm by a hydraulic press, and the applied pressure is 20MPa, then placed in a v...

example 2

[0019] Dry magnesium (99%) and boron (99%) powders were thoroughly mixed for 2 hours according to the ratio of atomic ratio Mg:B=1:4. The mixed powder is pressed into a sheet or block 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 -3 Fill the Pa with a mixture of argon and hydrogen, then heat the sheet or block at a heating rate of 60°C / min, keep the temperature at 700°C for 5 hours, and finally cool the sheet or block at a cooling rate of 25°C / min to room temperature. Then the flakes or blocks are crushed into a powder with a particle size of 10-15 microns, and metal magnesium powder is added thereto to obtain a mixed powder with an atomic ratio of magnesium and boron of 1:2. The mixed powder is pressed into a piece or block with a diameter of 20mm by a hydraulic press, and the pressure is 20-80MPa, and then placed in a vacuum annea...

example 3

[0021] Dry magnesium (99%) and boron (99%) powders are fully mixed according to the ratio of atomic ratio Mg:B=1:4 for 1-2 hours. 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 Pa was filled with argon, then the block was heated at a heating rate of 60 °C / min, kept at a temperature of 750 °C for 7 hours, and finally the block was cooled to room temperature at a cooling rate of 25 °C / min. Then the flakes or blocks are crushed into a powder with a particle size of 10-15 microns, and metal magnesium powder is added thereto to obtain a mixed powder with an atomic ratio of magnesium and boron of 1:2. The mixed powder is pressed into a sheet or block with a diameter of 20mm by a hydraulic press, and the applied pressure is 80MPa, then placed in a vacuum annealing furnace, and vacuumed at ...

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Abstract

A preparation method for MgB2 super-conductors characterizing in sintering a mixed powder of Mg and B in the atomic ratio of 1:4 then adding suitable volume of Mg powder in it to be sintered for the second time to get the MgB2 super-conductor.

Description

technical field [0001] a MgB 2 The preparation method of superconductor, involves a kind of stepwise reaction preparation MgB 2 approach to superconductors. Background technique [0002] A new type of second superconductor MgB with a superconducting transition temperature of 39K 2 The discovery of MgB has set off a research boom all over the world. Compared with oxide superconductors, MgB 2 The superconducting current density is high in medium, and the grain boundary is "transparent" to the superconducting current, that is, the superconducting current is not limited by the connectivity of the grain boundary, and at the same time, the MgB 2 The superconductor also has a simpler crystal structure than the oxide high-temperature superconductor of the perovskite structure, and is easier to prepare. MgB 2 The price of wire and strip is lower than that of HTS (high temperature superconductor) and LTS (low temperature superconductor), so MgB 2 It has broad application prospect...

Claims

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Application Information

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IPC IPC(8): H01B12/00H01B13/00H10N60/01
CPCY02E40/60
Inventor 闫果闫世成王庆阳冯勇卢亚锋李成山纪平吴怡芳张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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