Preparation method of magnesium diboride superconducting material

A superconducting material, magnesium diboride technology, applied in the direction of boron/boride, metal boride, etc., can solve the problems of inability to activate alloyed powder raw materials, small instantaneous impact force of grinding ball, short ball milling time, etc. Critical current density, improved superconductivity, low raw material requirements

Active Publication Date: 2013-09-18
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The density of agate is low, the instantaneous impact force of the ball during the ball milling process is relatively small, and the ball milling time is very short, therefore, the short-time ball milling of agate only plays the role of mixing raw materials, and cannot activate or even alloy powder raw materials

Method used

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  • Preparation method of magnesium diboride superconducting material
  • Preparation method of magnesium diboride superconducting material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh the Mg powder and the B powder according to the molar ratio Mg: B=1: 2 in the glove box with argon gas, the B powder purity is 96wt%, these raw materials are put into the tungsten carbide ball mill jar and seal, tungsten carbide mill The diameters of the balls are 5 mm and 10 mm, and the ball-to-material ratio is 64:1. Then, ball mill for 80 hours at a speed of 250r / min, put the above powder into a pure iron pipe, and after sealing, perform swaging, drawing and rolling at a deformation rate of 8% to obtain a strip of 0.5mm×4.0mm , sintered in an argon atmosphere, the sintering temperature is 700 ° C, and kept for 1 h to obtain MgB 2 superconducting tape. Such as figure 1 , figure 2 As shown, tungsten carbide ball milled for 80h to prepare MgB 2 The grain size of the sample is less than 50nm, and the agate ball milled for 30min to prepare MgB 2 The grain size of the samples exceeds 200 nm. It can be seen that MgB was prepared by long-time ball milling of tun...

Embodiment 2

[0022] Weigh the Mg powder and the B powder according to the molar ratio Mg: B=1: 2 in the glove box with argon gas, the B powder purity is 96wt%, these raw materials are put into the tungsten carbide ball mill jar and seal, tungsten carbide mill The diameters of the balls are 5 mm and 10 mm, and the ball-to-material ratio is 64:1. Then, ball mill for 80 hours at a speed of 250r / min, put the above powder into a pure iron pipe, and after sealing, perform swaging, drawing and rolling at a deformation rate of 8% to obtain a strip of 0.5mm×4.0mm , sintered in an argon atmosphere, the sintering temperature is 650 ° C, and the temperature is kept for 3 hours to obtain MgB 2 superconducting tape. Measure the critical current I of the sample with the standard four-lead method at 4.2K c With the change of the magnetic field, the quench criterion is 1μV / cm, and according to the critical current I c and MgB 2 The cross-sectional area of ​​the superconducting core is calculated to obt...

Embodiment 3

[0024] Weigh Mg powder and B powder according to mol ratio Mg: B=1: 2 in the glove box with argon, the purity of B powder is 96wt%, measures the acetone of Mg powder and B powder gross mass 5%, will These raw materials were put into a tungsten carbide ball mill jar and sealed. The diameter of the tungsten carbide balls was 5 mm and 10 mm, and the ball-to-material ratio was 64:1. Then, ball mill for 40 hours at a speed of 250r / min, put the above powder into a pure iron pipe, and after sealing, perform swaging, drawing and rolling at a deformation rate of 8% to obtain a strip of 0.5mm×4.0mm , sintered in an argon atmosphere, the sintering temperature is 700 ° C, and kept for 1 h to obtain MgB 2 superconducting tape. Measure the critical current I of the sample with the standard four-lead method at 4.2K c With the change of the magnetic field, the quench criterion is 1μV / cm, and according to the critical current I c and MgB 2 The cross-sectional area of ​​the superconducting ...

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Abstract

The invention relates to a preparation method of a magnesium diboride superconducting material, which comprises the following steps that: boron (B) powder (purity: 90 weight percent to 99.99 weight percent) and magnesium (Mg) powder are added into a grinding ball and a ball mill with the density being more than 5g / cm<3>, and ball milled in the argon gas atmosphere. Or a nano carbon (C), nano silicon carbide (SiC), hydrocarbon and carbohydrate doped body is added into the B powder and the Mg powder. The B powder can be also added into the grinding ball and the ball mill with the density being more than 5g / cm<3> to be pre-ball milled in the argon gas atmosphere, and then the pre-treated B powder and the Mg powder are added into the grinding ball and the ball mill with the density being more than 5g / cm<3> to be ball milled in the argon gas atmosphere. The ball milling time is 1 hour to 150 hours, the rotating speed is 100r / min to 1000r / min, and the ball-material ratio is 1:1 to 100:1. The ball milled powder is tabletted, and blocks are obtained; or the powder is arranged in a metal tube, and wires or strips are obtained by plastic processing; then the obtained blocks, wires or strips are sintered in the flowing argon gas atmosphere; and finally the magnesium diboride (MgB2) superconducting material is finally prepared.

Description

technical field [0001] The invention relates to a method for preparing a magnesium diboride superconducting material. Background technique [0002] Since Akimitsu et al. in Japan discovered magnesium diboride (MgB) with a critical transition temperature of 39K in 2001, 2 ) superconductor, scientists from various countries have conducted a lot of in-depth research on magnesium diboride superconducting materials. Compared with low-temperature superconducting materials, MgB 2 It can get rid of expensive liquid helium and work in the liquid hydrogen or refrigeration temperature zone (15-25K), reducing the use and maintenance costs; compared with high-temperature superconductors, MgB 2 The structure is simple, the coherence length is relatively large, and the critical current density will not be greatly reduced due to the weak connection of the grain boundary. It is easy to prepare superconducting wire strips with high current density. It has great potential in the field of sup...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/04C04B35/58C04B35/622
Inventor 马衍伟王成铎王栋樑高召顺张现平姚超王春雷
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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