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Method for preparing compound MgB2 superconductor

A magnesium diboride and superconductor technology, applied in the field of magnesium diboride superconductor preparation, can solve the problems of superconductors such as lack of effective pinning center, critical current density, reduced purity, poor material performance, etc., achieve small brittleness, improve effective pinning The effect of centering and good material performance

Inactive Publication Date: 2016-07-13
陈建峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: for MgB 2 The lack of effective pinning centers in superconductors leads to a decrease in its critical current density and purity, and because MgB has a brittleness similar to ceramics, the processing process will lead to MgB in the wire 2 Defects such as cracks in the core wire and poor material properties provide a method of taking magnesium powder, boron powder and white phosphorus, grinding them with absolute ethanol, freezing them into lumps with liquid nitrogen, stirring and preheating after crushing and sieving, Add ignited magnesium strips, then raise the temperature and keep stirring, filter to obtain the filtrate, wash with hydrochloric acid solution and distilled water, mix and grind with graphene after drying, and make composite superconductor wires by cold drawing. Magnesium diboride superconductor method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] First, according to the mass ratio of 12:8:1, weigh magnesium powder, boron powder and white phosphorus and put them into a ball mill, and grind them under the protection of nitrogen, use absolute ethanol as a grinding aid, and grind them at 180r / min for 1h, then After standing still for 5 minutes, use liquid nitrogen to freeze the ground material, make the ground material form a block, put the obtained block into a pulverizer for crushing, and pass through a 150-mesh sieve; then sieve the above Put the obtained granules into the reactor, use nitrogen to discharge the air in the reactor, heat to 40°C, stir and preheat for 30 minutes, then ignite the magnesium strips and quickly put them into the reactor, and burn the magnesium strips for 10 minutes. Take out, heat up to 500°C at 20°C / min, keep stirring for 3 hours, cool to room temperature naturally, discharge and filter, and collect the filtrate; use hydrochloric acid solution with a mass fraction of 1.0mol / L, rinse and...

example 2

[0018] First, according to the mass ratio of 12:8:1, weigh magnesium powder, boron powder and white phosphorus and put them into a ball mill, and grind them under the protection of nitrogen. After standing still for 8 minutes, use liquid nitrogen to freeze the ground material, make the ground material form a block, put the obtained block into a pulverizer for crushing, and pass through a 150-mesh sieve; then sieve the above Put the obtained particles into the reactor, use nitrogen to discharge the air in the reactor, heat to 45°C, stir and preheat for 35 minutes, then ignite the magnesium strips and quickly put them into the reactor, and burn the magnesium strips for 13 minutes. Take it out, raise the temperature to 550°C at 20°C / min, keep stirring for 5h, cool to room temperature naturally, discharge and filter, and collect the filtrate; use a hydrochloric acid solution with a mass fraction of 1.0mol / L, rinse and filter at a rate of 10mL / min Then use distilled water to rinse ...

example 3

[0020]First, according to the mass ratio of 12:8:1, weigh magnesium powder, boron powder and white phosphorus and put them into a ball mill, and grind them under the protection of nitrogen. After standing still for 10 minutes, use liquid nitrogen to freeze the ground material, make the ground material form a block, put the obtained block into a pulverizer for crushing, and pass through a 150-mesh sieve; then sieve the above Put the obtained particles into the reactor, use nitrogen to discharge the air in the reactor, heat to 50°C, stir and preheat for 40 minutes, then ignite the magnesium strips and quickly put them into the reactor, and burn the magnesium strips for 15 minutes. Take it out, raise the temperature to 600°C at 20°C / min, keep stirring for 6h, cool to room temperature naturally, discharge and filter, and collect the filtrate; use a hydrochloric acid solution with a mass fraction of 1.0mol / L, rinse and filter at a rate of 10mL / min Then use distilled water to rinse ...

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Abstract

The invention discloses a method for preparing compound MgB2 superconductor, and belongs to the technical field of MgB2 superconductor preparation. The method comprises the following steps: taking magnesium powder, boron powder and white phosphorus, milling with anhydrous ethanol, freezing into blocks with liquid nitrogen, conducting pulverization and sieving, then conducting stirring and preheating, adding an ignited magnesium rod, then heating, keeping heat and stirring, filtering to obtain a filtered matter, washing with a hydrochloric acid solution and distilled water, drying, mixing and grinding with graphene, conducting cold drawing to obtain a compound superconductor wire rod, and keeping heat in the xenon condition so as to prepare the compound MgB2 superconductor. The method has the benefits that the preparation steps are simple, the effective pinning center of the superconductor is effectively improved, the critical current density is increased by 12-16%, and the purity is increased by 25.6% or above; the fragility of the obtained product is less, the MgB2 core wire has no crack in the production process, and the material performance is good.

Description

technical field [0001] The invention relates to a method for preparing a composite magnesium diboride superconductor, belonging to the technical field of magnesium diboride superconductor preparation. Background technique [0002] A superconductor, as the name implies, is a conductor that has no energy dissipation after passing a current; theoretical calculations show that there is more than one energy band across the Fermi surface in magnesium diboride, and the Fermi surface instability caused by electroacoustic coupling is entirely possible in two energy bands. There is an energy gap at the Fermi surface. This point is completely different from all traditional superconductors. The images of the two energy gaps were later widely confirmed by specific heat, nuclear magnetic resonance, electron tunneling spectroscopy and angle-resolved photoelectron spectroscopy experiments. How the two energy gaps are formed and how it affects the superconducting properties is currently a h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/58
CPCC04B35/622C04B35/58C04B35/58057
Inventor 陈建峰盛海丰宋奇
Owner 陈建峰
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