Preparation of magnesium boride doped superconduction material

Abstract

A preparation method of a magnesium diboride-doped superconducting material comprises the following steps: respectively weighing magnesium powder and boron powder based on a mol ratio of 1:0.7-2.5; weighing a dopant based on the ratio of the total mass of the magnesium powder and the boron powder to the mass of the dopant of 1:0.01-1, wherein, the dopant is one of sorbic acid or sorbate; evenly mixing the magnesium powder, the boron powder and the dopant powder to obtain mixed powder; and sintering the mixed powder under the protection of argon atmosphere at the sintering temperature of 600 DEG C-1200 DEG C, and keeping the temperature for 0.5-12 hours, thus obtaining the superconducting material. The method has the advantages of short preparation time, low reaction temperature, high efficiency and low cost, and is especially suitable for industrialized production. The magnesium diboride superconducting material obtained by the method has obviously increased critical current density especially very high critical current density in a high magnetic field, which is beneficial to the application of the superconducting material to the high magnetic field; and the superconducting material has strong practicability.

Description

technical field [0001] The invention relates to a preparation method of a magnesium diboride superconducting material, in particular to a preparation method of a doped magnesium diboride superconducting material. Background technique [0002] The discovery of magnesium diboride superconductivity in 2001 aroused great interest in condensed matter physics and the superconducting industry. Scientists and engineers from various countries have conducted a lot of research on magnesium diboride superconducting materials. The transition temperature of magnesium diboride near 40K is twice that of the known binary intermetallic superconductors (Nb3Sn and Nb-Ti). The low superconducting transition temperature of traditional superconductors limits its practical application to the liquid helium temperature region, and thus the operation and maintenance costs are very expensive. Compared with traditional superconducting materials, the superconducting transition temperature of magnesium d...

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Problems solved by technology

Due to the agglomeration of the doped nano-carbon powder, the doped nano-carbon powder cannot be uniformly dispersed, resulting in uneven doping components of the prepared magnesium diboride superconductor, which affects the superconducting block. overall performance of

In addition, the agglomerated nanopowder will cause local excess of dopant, and the unreacted dopant will accumulate between the crystal grains of the sample, which will become a barrier to the superconducting current and further affect the superconducting performance.

On the other hand, the carbon material of nanoparticles is expensive and difficult to prepare, and solid carbon is doped into MgB 2 The crystal lattice is relatively difficult, requiring high reaction temperature and long reaction time, which limit the preparation of doped magnesium diboride superconducting materials

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