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Method for preparing MgB2 superconductive material

A technology of superconductors and raw materials, applied in the field of preparation of superconductor materials, can solve the problems of large-scale production and wide application, difficulty in obtaining high-purity B, complicated preparation process, etc., achieve good superconducting properties, reduce the requirements of reaction devices, and simplify preparation. The effect of craftsmanship

Inactive Publication Date: 2005-01-26
SHANGHAI UNIV
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Problems solved by technology

Due to the extreme volatility and easy oxidation of Mg, the preparation process is relatively complicated: the raw materials need to be packaged, the sintering furnace device must be sealed and pressure-resistant, and the high-pressure gas mixed with argon and hydrogen is passed through the sintering process, especially it is difficult to obtain high-purity B, and the price expensive
In this way, the existing preparation technology brings obstacles to large-scale production and its wide application

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0013] Embodiment one: the specific process steps of the present embodiment are as follows:

[0014] 1. Add 6.96 g of B 2 o 3 With 9.72 grams of Mg powder, grind under the protection of nitrogen, make it mix homogeneously;

[0015] 2. Put the ground raw materials into a ceramic crucible, cover it with a ceramic inner cover, and sprinkle an appropriate amount of Mg and B along the edge of the inner cover 2 o 3 Mix the powder to form a barrier between the raw material and the outside air;

[0016] 3. Put the above crucible into a vacuum sintering furnace for sintering;

[0017] 4. During sintering, follow the steps in sequence: first raise the temperature to 400°C for 1 hour, then raise the temperature to 600°C for 1 hour, then raise the temperature to 800°C for 2 hours, and finally cool naturally to room temperature in a vacuum state to obtain MgB 2 superconductor;

[0018] It is proved by standard four-lead resistance measurement, magnetic susceptibility measurement and ...

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Abstract

The invention relates to a process for preparing MgB2 superconducting material which comprises the steps of, grinding B2O3 and Mg powder under the protection of oinert gas, loading the grinded raw material into ceramic crucible, sintering the crucible in vacuum pit furnace, naturally cooling down to room temperature in vacuum or under the inert gas protection status.

Description

technical field [0001] The invention relates to a preparation method of a superconductor material, especially a kind of MgB 2 Preparation method of superconductor material. Background technique [0002] Since the first discovery of MgB with a critical transition temperature of 39K in January 2001 2 Since superconductors, scientists from various countries have studied MgB 2 Synthetic methods for superconductors have been extensively studied, since so far neither MgB nor 2 The preparation technology of thin film or bulk material is relatively complicated and not yet fully mature. The bulk material is the basis for the application of superconducting strong electricity and the research of its physical properties. MgB 2 The preparation method of the superconductor block is mainly a chemical solid-phase reaction method, using high-purity Mg powder and B powder as raw materials, and sintering under high pressure. Due to the extremely volatile and oxidizable properties of Mg, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/04C04B35/58C04B35/622H01B12/00
CPCY02E40/64Y02E40/60
Inventor 高召顺张义邴
Owner SHANGHAI UNIV
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