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Method for preparing magnesium diboride superconductive material

A superconducting material, a technology of magnesium diboride, is applied in the field of preparing magnesium diboride superconducting materials, and can solve the problems of superconducting current obstruction, limited preparation, uneven doping composition of magnesium diboride superconductor, etc. The effect of increasing critical current density, increasing critical current density, and non-toxic and harmless preparation

Inactive Publication Date: 2008-10-08
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the agglomeration of the doped nano-carbon powder, the doped nano-carbon powder cannot be uniformly dispersed, resulting in uneven doping components of the prepared magnesium diboride superconductor, which affects the superconducting block. overall performance of
In addition, the agglomerated nanopowder will cause local excess of dopant, and the unreacted dopant will accumulate between the crystal grains of the sample, which will become a barrier to the superconducting current and further affect the superconducting performance.
On the other hand, the carbon material of nanoparticles is expensive and difficult to prepare, and solid carbon is doped into MgB 2 The crystal lattice is relatively difficult, requiring high reaction temperature and long reaction time, which limit the preparation of doped magnesium diboride superconducting materials

Method used

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  • Method for preparing magnesium diboride superconductive material
  • Method for preparing magnesium diboride superconductive material
  • Method for preparing magnesium diboride superconductive material

Examples

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Embodiment 1

[0023] A kind of embodiment of the present invention is, a kind of preparation method of magnesium diboride superconducting material, and its concrete practice is:

[0024] Weigh magnesium powder and boron powder according to molar ratio 1: 2; Then weigh dopant by the mass ratio 1: 0.05 of the total mass of magnesium powder and boron powder and dopant, dopant is citric acid; Direct magnesium Powder, boron powder and dopant powder are uniformly mixed to form a mixed powder; the mixed powder is pressed into a tablet, and then sintered under the protection of an argon atmosphere at a sintering temperature of 800°C and kept for 1 hour to obtain magnesium diboride superconducting bulk.

[0025] figure 2 It shows that the magnesium diboride superconducting bulk material prepared in this example can reach a critical current density of 15000A / cm at 10K, 4T 2 , compared with undoped magnesium diboride superconducting bulk material, the critical current density increased by 70%. Whe...

Embodiment 2

[0027] Weigh the Mg powder and B powder in a molar ratio of 1:2.1. Then weigh the citric acid powder of the dopant according to the mass ratio of the total mass of the Mg powder and the B powder to the dopant is 1:0.1. Dissolve citric acid powder in acetone to form a solution, then ultrasonically disperse and mix this solution with weighed B powder to obtain a uniform suspension, vacuum dry to obtain a mixed powder, and then mix it with weighed Mg powder to form a mixed powder and compress the mixed powder into tablets. The pressed sheet is sintered in an argon atmosphere, that is, it is kept at 1000° C. for 0.5 hour, and then rapidly cooled to room temperature to obtain a doped magnesium diboride superconducting bulk material. image 3 The critical current density curve of the magnesium diboride superconducting bulk material prepared for this example, it can be seen from the figure that its critical current density can reach 18200A / cm under the conditions of 10K and 4T 2 . ...

Embodiment 3

[0029] Weigh the Mg powder and B powder in a molar ratio of 1:2. The mass ratio of the total mass of the Mg powder and the B powder mass to the dopant is 1:0.05 to weigh the dopant calcium citrate powder. Mix the three powders evenly, press the mixed powder into a tablet, sinter the tablet in an argon atmosphere, keep it at 700°C for 5 hours, and cool it to room temperature with the furnace to prepare a superconducting block doped with magnesium diboride material. Figure 4The critical current density curve of the magnesium diboride superconducting bulk material prepared for this example. It can be seen from the figure that when the temperature is 20K and the external magnetic field is 4T, the critical current density of the magnesium diboride superconducting bulk material reaches 613A / cm 2 , which is 939% higher than that of undoped magnesium diboride superconducting bulk.

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Abstract

The invention relates to a method for preparing magnesium boride superconducting material. The method for preparing the magnesium boride superconducting material is that magnesium powder and boron powder are respectively weighted according to 1:0.7-2.5 of molar ratio; adulterant which is one of citric acid and citrate is weighted according to 1:0.01-1 of mass ratio between the total mass of the magnesium powder and the boron powder and the mass of the adulterant is weighted; the magnesium powder, the boron powder and the adulterant are evenly mixed into mixing powder, then sintered under the protection of argon atmosphere at the temperature of 600-1200 DEG C and the product is obtained after the heat is preserved for 0.5-12 hours. The method has short preparation time, low reaction temperature, high efficiency and low cost and is especially suitable for industrial production; the critical current density of the magnesium boride superconducting material prepared by the method is increased remarkably and is especially very high in highfield, thereby being good for the application in highfield and having strong practicability.

Description

technical field [0001] The invention relates to a method for preparing a magnesium diboride superconducting material, in particular to a method for preparing a doped magnesium diboride superconducting material. Background technique [0002] The discovery of magnesium diboride superconductivity in 2001 aroused great interest in condensed matter physics and the superconducting industry. Scientists and engineers from various countries have conducted a lot of research on magnesium diboride superconducting materials. The transition temperature of magnesium diboride near 40K is twice that of the known binary intermetallic superconductors (Nb3Sn and Nb-Ti). The low superconducting transition temperature of traditional superconductors limits its practical application to the liquid helium temperature region, and thus the operation and maintenance costs are very expensive. Compared with traditional superconductors, the superconducting transition temperature of magnesium diboride 40K ...

Claims

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Application Information

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IPC IPC(8): C01B35/04H01B12/00
CPCY02E40/64Y02E40/60
Inventor 杨烨周杰俤赵勇程翠华张勇
Owner SOUTHWEST JIAOTONG UNIV
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