Preparation of magnesium boride doped superconduction material

A superconducting material, magnesium diboride technology, applied in the field of preparation of doped magnesium diboride superconducting materials, can solve the problem that the doped nano-carbon powder cannot be uniformly dispersed, affecting the overall performance of the superconducting block, carbon high material prices

Inactive Publication Date: 2009-06-24
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,

Method used

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  • Preparation of magnesium boride doped superconduction material
  • Preparation of magnesium boride doped superconduction material
  • Preparation of magnesium boride doped superconduction material

Examples

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Embodiment 1

[0025] A kind of embodiment of the present invention is, a kind of preparation method of magnesium diboride superconducting material, and its concrete practice is:

[0026] Weigh magnesium powder and boron powder by molar ratio 1:2; Then weigh the dopant by the mass ratio 1:0.05 of the total mass of magnesium powder and boron powder and dopant, dopant is sorbic 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.

[0027] figure 1 The criticality of the magnesium diboride superconducting bulk material prepared for Example 1 of the present invention and the citric acid-doped magnesium diboride bulk material and undoped magnesium diboride superconducting bulk material prepared under the same conditions Current densit...

Embodiment 2

[0029] The invention discloses a method for preparing a magnesium diboride superconducting material. The specific method is: weighing Mg powder and B powder according to a molar ratio of 1:2.1. Then weigh the dopant sorbic acid powder according to the mass ratio of the total mass of Mg powder and B powder to the dopant is 1:0.1. Dissolve sorbic 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. Sintering the pressed tablet in an argon atmosphere, the sintering temperature is 1000° C., the holding time is 0.5 hour, and it is rapidly cooled to room temperature to obtain a doped magnesium diboride superconducting bulk material.

[0030] figure 2 The critical current density curve of the magnesium diboride superconducting bulk material prepar...

Embodiment 3

[0032] A preparation method of a magnesium diboride superconducting material, the specific method is: weighing Mg powder and B powder according to a molar ratio of 1:2. Then weigh the dopant calcium sorbate powder according to the mass ratio of the total mass of Mg powder and B powder mass to the dopant is 1:0.05. Mix the three powders evenly, press the mixed powder into tablets, and sinter the tablets in an argon atmosphere at a sintering temperature of 700°C. After 5 hours of heat preservation, cool to room temperature with the furnace to prepare doped magnesium diboride. superconducting bulk.

[0033] image 3 The criticality of the magnesium diboride superconducting bulk material prepared for Example 3 of the present invention and the citric acid-doped magnesium diboride bulk material and undoped magnesium diboride superconducting bulk material prepared under the same conditions Current density curve. It can be seen from the figure that when the temperature is 20K and t...

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Abstract

A preparation method of a magnesium diboride-doped superconducting material comprises the following steps: respectively weighing magnesium powder and boron powder based on a mol ratio of 1:0.7-2.5; weighing a dopant based on the ratio of the total mass of the magnesium powder and the boron powder to the mass of the dopant of 1:0.01-1, wherein, the dopant is one of sorbic acid or sorbate; evenly mixing the magnesium powder, the boron powder and the dopant powder to obtain mixed powder; and sintering the mixed powder under the protection of argon atmosphere at the sintering temperature of 600 DEG C-1200 DEG C, and keeping the temperature for 0.5-12 hours, thus obtaining the superconducting material. The method has the advantages of short preparation time, low reaction temperature, high efficiency and low cost, and is especially suitable for industrialized production. The magnesium diboride superconducting material obtained by the method has obviously increased critical current density especially very high critical current density in a high magnetic field, which is beneficial to the application of the superconducting material to the high magnetic field; and the superconducting material has strong practicability.

Description

technical field [0001] The invention relates to a preparation method of a magnesium diboride superconducting material, in particular to a preparation method of 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 superconducting materials, the superconducting transition temperature of magnesium d...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622H01B12/00
CPCY02E40/64Y02E40/60
Inventor 杨烨赵勇张勇程翠华
Owner SOUTHWEST JIAOTONG UNIV
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