In-situ preparation method of magnesium borate-magnesium oxide multiphase superconducting material with different superconducting phase contents

A superconducting material, in-situ preparation technology, applied in the manufacture/processing of superconductor devices, etc., can solve the unsolved problems of in-situ regulation of superconducting phase content, inability to obtain superconducting composite materials, etc.

Inactive Publication Date: 2014-06-11
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simply superconducting phase MgB 2 It is impossible to obtain a composite material with superconductivity if mixed with the insulating phase MgO in proportion and sintered
In situ synthesized MgB 2 -MgO composite phase superconductor (National Invention Patent No.ZL200410017952.0) is considered to be the most potential resistive superconducting fault current limiter material and basic material for magnesium boride weak connection research, but so far this composite phase superconducting material has not been Technology to solve in-situ regulation of superconducting phase content

Method used

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  • In-situ preparation method of magnesium borate-magnesium oxide multiphase superconducting material with different superconducting phase contents

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. Preparation of substrate. Take a certain amount of B, Mg and B in a molar ratio of 2: 5: 1 2 o 3 After the powder is dried, it is weighed according to the predetermined molar ratio, fully ground, and pressed into a block by a tablet machine;

[0015] 2. The sealing of the base material. The specific steps are as follows: press the above-mentioned ground raw materials into blocks, put them into a ceramic crucible, cover them with a ceramic inner cover, and then sprinkle an appropriate amount of B 2 o 3 powder;

[0016] 3. Sintering of the base material. The above samples were sintered in a vacuum sintering furnace. During sintering, the following steps are followed: first, heat up to 420°C for half an hour (to form a protective barrier between the raw material and the outside world), then heat up to 620°C for 1 hour, and then heat up to 820°C for 2 hours. Finally, naturally cool to room temperature under vacuum atmosphere;

[0017] Through standard four-lead r...

Embodiment 2

[0019] 1. Preparation of substrate. Take a certain amount of powder B, Mg and B at a molar ratio of 6:7:1 2 o 3 After drying, it is weighed according to the predetermined molar ratio, fully ground, and pressed into a block by a tablet press;

[0020] 2. The sealing of the base material. The specific steps are as follows: press the above-mentioned ground raw materials into blocks, put them into a ceramic crucible, cover them with a ceramic inner cover, and then sprinkle an appropriate amount of B 2 o 3 powder;

[0021] 3. Sintering of the base material. The above samples were sintered in a vacuum sintering furnace. During sintering, the following steps are followed: first, heat up to 450°C for half an hour (to form a protective barrier between the raw material and the outside world), then heat up to 650°C for 1 hour, and then heat up to 850°C for 2 hours. Finally, naturally cool to room temperature under vacuum atmosphere;

[0022] Through standard four-lead resistance ...

Embodiment 3

[0024] 1. Preparation of substrate. Take a certain amount of B, Mg and B at a molar ratio of 10:9:1 2 o 3 After the powder is dried, it is weighed according to the predetermined molar ratio, fully ground, and pressed into a block by a tablet machine;

[0025] 2. The sealing of the base material. The specific steps are as follows: press the above-mentioned ground raw materials into blocks, put them into a ceramic crucible, cover them with a ceramic inner cover, and then sprinkle an appropriate amount of B 2 o 3 powder;

[0026] 3. Sintering of the base material. The above samples were sintered in a vacuum sintering furnace. During sintering, the following steps are followed: first, heat up to 420°C for half an hour (to form a protective barrier between the raw material and the outside world), then heat up to 620°C for 1 hour, and then heat up to 820°C for 2 hours. Finally, naturally cool to room temperature under vacuum atmosphere;

[0027] Through standard four-lead re...

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Abstract

The invention discloses an in-situ preparation method of a magnesium borate-magnesium oxide multiphase superconducting material with different superconducting phase contents. According to the method, an MgB2-MgO multiphase superconductor adjustable and controllable in the superconducting phase content in situ is prepared in vacuum through taking boron (B), magnesium (Mg) and diboron trioxide (B2O3) as raw materials. The invention relates to a method for preparing a magnesium diboride (MgB2) multiphase superconducting material adjustable and controllable in the superconducting phase content in situ. The preparation method disclosed by the invention is simple and has the advantages that the wide-range in-situ adjustment and control of the superconducting phase content of an MgB2 multiphase superconductor can be realized and key techniques and base materials are provided for studying the magnesium borate superconducting weak connection property, the flux pinning behavior, the resistor type magnesium borate superconducting fault current limiter (SCFCL) and the like.

Description

technical field [0001] The invention relates to a method for a magnesium boride-magnesia composite superconductor, in particular to an in-situ preparation method for a magnesium boride-magnesia composite superconducting material with different superconducting phase contents. Background technique [0002] MgB with a critical transition temperature up to 39K 2 Compared with traditional alloy superconductors and high-temperature oxide superconductors, superconductors have common or unique advantages, such as simple structure, high critical temperature, strong current-carrying capacity, long coherence length, and low normal-state resistivity. The type II superconductor has the theoretical basis of superconductivity and the potential application value of superconducting strong electric / weak electric. Therefore, since the discovery of its superconductivity in 2001, it has become a hot spot for scientists around the world, and various countries have conducted extensive research on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/04H01L39/24
Inventor 张义邴朱娇牛晓龙朱红妹
Owner SHANGHAI UNIV
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