Process for preparing magnesium diboride superconductor

A magnesium diboride and superconductor technology, applied in the field of magnesium diboride superconductor preparation, can solve the problems of lowering the transition temperature of magnesium diboride, low critical current density of magnesium diboride, poor connection performance, etc.

Inactive Publication Date: 2008-04-30
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the critical current density of magnesium diboride is still very low compared with low-temperature superconductors
The usual method for preparing magnesium diboride is to sinter the mixture of B and Mg in the Ar atmosphere to form magnesium diboride through a diffusion reaction. The bulk and strips of magnesium diboride prepared by this method are usually loose, resulting in The connection performance between grains is relatively poor, resulting in poor critical current density
In the process of preparing magnesium diboride by solid-state sintering, the density of magnesium diboride can be increased by applying pressure, but this method is easy to reduce the transition temperature of magnesium diboride, and it is difficult to prepare practical blocks and strips. materials, greatly affecting the practical progress of magnesium diboride superconductors

Method used

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  • Process for preparing magnesium diboride superconductor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The superconducting magnesium powder and superconducting boron powder prepared according to the stoichiometric ratio of 0.7:2 are mixed evenly and put into the mold, pressed into small pieces with a diameter of 5 mm and a thickness of 5 mm, wrapped and sealed with Ta foil, and the block sample 3 placed on the sample holder 2 in the superconducting strong magnetic field heat treatment furnace 1 with an Ar atmosphere. Turn on the power of the strong magnetic field device 4 and make its magnetic field strength reach 0.5 Tesla, and then turn on the power of the heat treatment furnace 1. After the heat treatment furnace 1 was kept at a temperature of 950° C. for 3 hours, the power of the heat treatment furnace 1 was turned off, and the sample was cooled to room temperature with the heat treatment furnace, and the sample was taken out to obtain a magnesium diboride superconducting block.

Embodiment 2

[0015] The superconducting magnesium powder and the superconducting boron powder prepared according to the stoichiometric ratio of 1:2 are evenly mixed and put into a mold, pressed into small pieces with a diameter of 5 mm and a thickness of 5 mm, wrapped and sealed with Ta foil, and the block sample 3 Placed on the sample holder 2 in 1 of the superconducting high magnetic field heat treatment furnace with Ar atmosphere. Turn on the power of the strong magnetic field device 4 and make its magnetic field strength reach 3 Tesla, and then turn on the power of the heat treatment furnace 1. After the heat treatment furnace 1 was kept at a temperature of 600° C. for 3 hours, the power of the heat treatment furnace 1 was turned off, and the sample was cooled to room temperature with the heat treatment furnace, and the sample was taken out to obtain a magnesium diboride superconducting block.

Embodiment 3

[0017] The superconducting magnesium powder and the superconducting boron powder prepared according to the stoichiometric ratio of 0.9:2 are evenly mixed and put into a mold, pressed into small pieces with a diameter of 5 mm and a thickness of 5 mm, wrapped and sealed with Ta foil, and the block sample 3 Placed on the sample holder 2 in 1 of the superconducting high magnetic field heat treatment furnace with Ar atmosphere. Turn on the power of the strong magnetic field device 4 and make its magnetic field strength reach 6 Tesla, and then turn on the power of the heat treatment furnace 1. After the heat treatment furnace was kept at a temperature of 900°C for 3 hours, the power of heat treatment furnace 1 was turned off, the sample was cooled to room temperature with the heat treatment furnace, and the sample was taken out to obtain a magnesium diboride superconducting block.

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Abstract

The preparation process of magnesium diboride superconductor features that magnesium diboride superconductor is prepared in strong magnetic field. Magnesium powder and boron powder in stoichiometric ratio are mixed homogeneously, the mixture is prepared into lump or belt sample, and the lump or belt sample is set heating furnace with Ar atmosphere and strong magnetic field and maintained at magnetic field of 0-30 tesla and temperature of 600-950 deg.c for 1-3 hr before the power source for the strong magnetic field and heating is turned off and the sample is cooled to room temperature inside the furnace. The present invention has effectively improved crystal grain connectivity and greatly raised clinical current structure of the magnesium diboride superconductor.

Description

technical field [0001] The invention belongs to a method for preparing a superconducting material, in particular to a method for preparing a magnesium diboride superconductor. Background technique [0002] In January 2001, the magnesium diboride superconductor with a critical transition temperature of 39K was discovered by Akimitsu et al. in Japan (Nature410(2001)63), which aroused widespread concern around the world and set off an upsurge in the study of superconductivity of simple compounds. The structure of magnesium diboride is very simple. It is formed by alternating stacking of Mg and B layers. In the B layer, B-B is bonded by strong covalent bonds; in the c-axis direction, Mg-B is bonded by ionic bonds, which is a typical AlB. 2 Hexagonal symmetric structure with anisotropy with a coefficient of about 2. The biggest advantage of magnesium diboride is that it can be applied at higher temperatures (20-30K), while low-temperature superconductors such as Nb 3 Sn, NbTi, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 马衍伟
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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