Method for preparing magnesium diboride superconductive wire and strip

Abstract

The invention relates to a method for preparing a magnesium boride superconducting line and belt material. The preparation method is that a. preparation of precursor powder: high magnesium diboride MgBx powder is taken as the precursor powder, wherein, x is more than or equal to 4 and less than or equal to 12; or magnesium powder and amorphism boron powder are mixed according to 1:3-20 of stoichiometric ratio between magnesium and boron to form the precursor powder; b. putting into a magnesium pipe: the precursor powder is put into a magnesium pipe, compacted and sealed; c. putting into a canning pipe: the magnesium pipe is put into a metal canning pipe and is sealed after the metal canning pipe is fully filled with metal powder as a barrier layer; or the magnesium pipe is first put into a barrier layer metal pipe and then is put into the metal canning pipe and the metal canning pipe is sealed; d. moulding treatment: the metal canning pipe is produced into line and belt material; e. heat treatment: the metal canning pipe is put into a pipe typed furnace and under the protection of argon, the temperature is raised to 700-1200 DEG C by the speed of 1-10 DEG C / minute, preserved for 1-30 hours and then cooled to room temperature. The MgB2 superconducting line and belt material prepared by the method has high compactability, good grain connectivity and even cross section.

Description

Technical field

[0001] The invention relates to a preparation method of a superconducting material, in particular to a preparation method of a magnesium diboride superconducting material. Background technique

[0002] The preparation of high-efficiency and high-quality superconducting wire strips is the basis for the development of 21st century superconductivity, superconducting magnets, superconducting energy storage and other applications. Magnesium Diboride (MgB 2 ) Superconducting materials are considered to have huge market potential in future medical MRI applications. With MgB 2 The performance of superconducting materials has been further improved. At present, under the conditions of 4.2K and 12T, the critical current density has exceeded 2×10. 4 A / cm 2 ; At 20K temperature, irreversible field (H irr ) Has also reached 10T, which can be compared with the traditional superconducting material NbTi / Nb 3 Sn is comparable.

[0003] Existing MgB 2 Preparation methods of supercon...

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