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Rapid preparation method of magnesium diboride bulk

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

Inactive Publication Date: 2009-11-25
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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  • Rapid preparation method of magnesium diboride bulk
  • Rapid preparation method of magnesium diboride bulk
  • Rapid preparation method of magnesium diboride bulk

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 green compact with a tantalum sheet, 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, and the specifi...

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Abstract

The invention is a rapid preparation method of magnesium diboride bulk, applying rapid heating and short time sintering process to prepare magnesium diboride superconducting bulk on the base of traditional solid-phase reaction method and powder-in-tube method (PIT), the materials are rapid molding in air without protection of vacuum or inert gas, and the materials are adulterated with nano-scale silicon carbide (40 nm). The invention provided preparation method is mixing magnesium powder and boron powder of 1:2 stoichiometric proportion in addition with 5-8% mass ratio nano silicon carbide, the loading well-mixed powder into stainless steel tube with two ends compressed tightly and welding sealed by argon arc, at last putting the sealed stainless steel tube into tube furnace and heating to 950 DEG in 70 seconds then holding for 10 minutes. The magnesium diboride conducting bulk prepared according to the method has high critical current density in 20 K and the non-reversible field arriving 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 Applications(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 施智祥丁祎
Owner SOUTHEAST UNIV
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