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Process for preparing magnesium diboride superconductor

A magnesium diboride and superconductor technology, applied in the field of preparation of magnesium diboride superconductors, can solve the problems affecting the practical progress of magnesium diboride superconductors, poor connection performance, difficulty in preparing practical blocks and strips, etc.

Inactive Publication Date: 2005-10-19
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
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Effect test

Embodiment 1

[0014] The superconducting powder magnesium powder and superconducting powder boron powder prepared according to the stoichiometric ratio of 0.7:2 are uniformly mixed and loaded into the mold, and pressed into small pieces with a diameter of 5mm and a thickness of 5mm. After being wrapped and sealed by Ta foil, 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 the 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 is kept at a temperature of 950°C for 3 hours, the power supply of the heat treatment furnace 1 is turned off, the sample is cooled to room temperature along with the heat treatment furnace, and the sample is taken out, thereby obtaining a magnesium diboride superconducting bulk material.

Embodiment 2

[0016] The superconducting powder magnesium powder and superconducting powder boron powder prepared according to the stoichiometric ratio of 1:2 are uniformly mixed and loaded into the mold, and pressed into small pieces with a diameter of 5mm and a thickness of 5mm. After being wrapped and sealed by Ta foil, the block sample 3 Place on the sample holder 2 in 1 in the superconducting high magnetic field heat treatment furnace with Ar atmosphere. Turn on the power of the strong magnetic field device 4 and make the magnetic field strength reach 3 Tesla, and then turn on the power of the heat treatment furnace 1. After the heat treatment furnace 1 is kept at a temperature of 600° C. for 3 hours, the power supply of the heat treatment furnace 1 is turned off, the sample is cooled to room temperature along with the heat treatment furnace, and the sample is taken out, thereby obtaining a magnesium diboride superconducting bulk material.

Embodiment 3

[0018] The superconducting powder magnesium powder and superconducting powder boron powder prepared according to the stoichiometric ratio of 0.9:2 are uniformly mixed and loaded into the mold, and pressed into small pieces with a diameter of 5mm and a thickness of 5mm. After being wrapped and sealed by Ta foil, the block sample 3 Place on the sample holder 2 in 1 in the superconducting high magnetic field heat treatment furnace with Ar atmosphere. Turn on the power of the strong magnetic field device 4 and make the magnetic field strength reach 6 Tesla, and then turn on the power of the heat treatment furnace 1. After the heat treatment furnace is kept at a temperature of 900° C. for 3 hours, the power supply of the heat treatment furnace 1 is turned off, the sample is cooled to room temperature along with the heat treatment furnace, and the sample is taken out, thereby obtaining a magnesium diboride superconducting bulk material.

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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, and particularly relates to a method for preparing a magnesium diboride superconductor. Background technique [0002] In January 2001, Japan's Akimitsu et al. discovered a magnesium diboride superconductor with a critical transition temperature of 39K (Nature410 (2001) 63), which attracted widespread attention 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 alternately stacking Mg and B layers. In the B layer, B-B is bonded by a strong covalent bond; in the c-axis direction, Mg-B is bonded by an ionic bond, which is a typical AlB 2 The hexagonal symmetric structure has 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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IPC IPC(8): C04B35/58C04B35/622
Inventor 马衍伟
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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