Method for preparing MgB2 superconducting material

A technology of superconducting materials and organic acids, which is applied in the field of preparation of MgB2 superconducting materials, can solve the problems of increased preparation cost, easy to be peeled off, and increased specific surface area, so as to enhance electron scattering intensity, overcome oxidation and even spontaneous combustion, and improve Effect of Flux Pinning Force
CN101168441BInactive Publication Date: 2010-06-23INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
Publication Date
2010-06-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a process for preparing MgB2 superconductive material, wherein according to mol ratio Mg:B=1:2, the invention weights Mg powder and B powder, and weights organic acid or organic acid salt at 5-30% weight of total Mg powder and B powder, to be dissolved in 5-50mL acetone or alcohol, mixes the solution with Mg powder and B powder, to be ball milled for 1-10h, to be dried ina vacuum drying box, tablets the powder, to obtain MgB2 superconductive block, or fills the powder into metal tube or metal composite tube, to be sealed and rotationally forged, drawn or rolled with 5% deformation ratio, to obtain MgB2 superconductive band, arranges the superconductive block or band into a vacuum furnace, under vacuum to argon gas protection and thermal treatment temperature as 650-950DEG C, to keep temperature for 0.5-2h, to obtain MgB2 superconductive material. The inventive MgB2 superconductive material can effectively overcome the oxidation and self-combustion problems ofhigh-energy ball milled refined magnesium powder, and the invention adds doping material to significantly improve the superconductivity of the MgB2 superconductive material.
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Description

technical field

[0001] The present invention relates to a kind of MgB 2 Methods for the preparation of superconducting materials. Background technique

[0002] Since the discovery of a new type of superconductor magnesium diboride (MgB) with a superconducting transition temperature as high as 39K in 2001, 2 ) Since then, scientists from various countries have conducted a large number of in-depth studies. At present, in the preparation of high-performance MgB 2 Among the wire and strip methods, the in-situ (in-situ) powder tube (Powder-In-Tube) technology is the most convenient and practical one, but its critical current density (Jc) is still low. Studies have shown that the particle size of the original powder has an effect on the MgB 2 The critical current density of superconducting materials plays an important role. The sample prepared by the Japanese research group using submicron or nanoscale magnesium powder can reach a higher critical current density ([Yamada H.Hi...

Claims

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