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A kind of method for rapidly preparing magnesium diboride bulk material

A magnesium diboride, rapid technology, applied in the field of rapid preparation of magnesium diboride superconducting bulk materials, can solve the problems of unfavorable magnesium diboride critical current density and increase, so as to improve the critical current density and simplify the process flow , the effect of reducing production costs

Inactive Publication Date: 2011-12-14
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These are not conducive to the improvement of the critical current density of magnesium diboride

Method used

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  • A kind of method for rapidly preparing magnesium diboride bulk material
  • A kind of method for rapidly preparing magnesium diboride bulk material
  • A kind of method for rapidly preparing magnesium diboride bulk material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The magnesium powder and the boron powder with a purity of 99.8% and a particle size of 325 mesh are uniformly mixed according to the atomic ratio of magnesium and boron of 1:2, and are uniformly mixed by ball milling, manual grinding or ultrasonic dispersion. Fill the fully mixed powder into a stainless steel pipe (SUS304), compact and fill the mixed powder, press both ends of the steel pipe with a press, and seal it with argon arc welding. Put the packaged steel pipe into the tube sintering furnace. The temperature of the tube furnace is preset at 950°C, and the sample reaches the preset temperature within 70 seconds. After 10 minutes, the sample is taken out of the furnace and cooled to room temperature naturally to obtain a pure magnesium diboride superconductor prepared by the PIT method. blocks. The sample has a self-field Jc of 2×10 5 A / cm 2 , the irreversible field is greater than 4 Tesla.

Embodiment 2

[0036]Mix the magnesium powder and boron powder with a purity of 99.8% and a particle size of 325 mesh according to the atomic ratio of magnesium and boron of 1:2, and add 5% by mass ratio of nano-silicon carbide, and use ball milling, manual grinding or ultrasonic dispersion to mix evenly . Fill the fully mixed powder into a stainless steel pipe (SUS304), compact and fill the mixed powder, press both ends of the steel pipe with a press, and seal it with argon arc welding. Put the packaged steel pipe into the tube sintering furnace. The temperature of the tube furnace is preset at 950°C, and the sample reaches the preset temperature within 70 seconds. After 10 minutes, the sample is taken out of the furnace and cooled to room temperature naturally to obtain the doped silicon carbide diboride prepared by the PIT method. Magnesium superconducting bulk. The sample has a self-field Jc of 2×10 5 A / cm 2 , the irreversible field is about 5.5 Tesla.

Embodiment 3

[0038] Mix the magnesium powder and boron powder with a purity of 99.8% and a particle size of 325 mesh according to the atomic ratio of magnesium and boron of 1:2, and add 8% by mass ratio of nano-silicon carbide, and use ball milling, manual grinding or ultrasonic dispersion to mix evenly . Put the fully mixed powder into a stainless steel mold for tabletting, wrap and seal the compact with tantalum sheets, and put it into a sample boat. The sample boat was then placed into a tube furnace. The temperature of the tube furnace was preset at 830°C, and the sample reached the preset temperature within 70 seconds. After 15 minutes, the sample was taken out of the furnace and cooled naturally to room temperature to obtain a pure magnesium diboride superconducting block. The sample has a self-field Jc of 1.5×10 5 A / cm 2 , the irreversible field is about 6 Tesla.

[0039] Use the existing method to prepare magnesium diboride block material as a comparison, the specific steps are...

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Abstract

The present invention is a method for quickly preparing magnesium diboride block materials. On the basis of the traditional solid-state reaction method and powder in tube method (PIT), the magnesium diboride superconducting block is prepared by adopting a rapid heating and short-time sintering process. The material is rapidly formed in the air without vacuum or inert gas protection, and the material is doped with nano-scale silicon carbide (40nm). The preparation method of the present invention is to mix the magnesium powder and boron powder with a stoichiometric ratio of 1:2 and nano-silicon carbide with a mass ratio of 5-8% to mix evenly, then put the fully mixed powder into a stainless steel tube, and press both ends It is sealed with argon arc welding, and finally the packaged stainless steel tube is placed in a tube furnace, and the temperature is raised to 950°C within 70 seconds, and only stays for 10 minutes. The magnesium diboride superconducting bulk material prepared by this method has a high critical current density at 20K, and the irreversible field reaches 5.5~6 Tesla.

Description

technical field [0001] The invention relates to a preparation method of a superconducting material, in particular to a rapid preparation method of a magnesium diboride superconducting bulk material. Background technique [0002] On January 10, 2001, Professor J. Akimitsu of Aoyama College in Japan [1] and others announced the discovery of magnesium diboride (MgB2), the metal compound superconductor with the highest critical temperature so far, with a superconducting transition temperature of 39K. Magnesium diboride is a binary compound of A15 structure, which has the advantages of large coherence length, no weak connection of grain boundary and low normal resistivity, and the synthesis process is simple and the cost is low. The biggest advantage of magnesium diboride is that it can work in the temperature range of 20-30K. In this way, an electric-driven gas refrigerator can be used instead of expensive liquid helium for cooling, so that magnesium diboride is expected to beco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 施智祥丁祎
Owner SOUTHEAST UNIV