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Magnesium diboride super conductive material and its preparing method

A technology of magnesium diboride and superconducting materials, which is applied in the field of preparation of superconducting materials, can solve problems affecting the practical progress of magnesium diboride superconductors, and achieve critical current density improvement, grain refinement, and magnetic flux nailing. The effect of improving the tension

Inactive Publication Date: 2007-06-27
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for better control over how much energy flows into atoms during their formation process by controllably adjusting certain parameters such as temperature, pressure, etc., which helps prevent damage from unwanted particles that may affect important properties like conductivity. Additionally, this technique makes possible creative ways to make high-quality MgB2 with specific structures called pinned centers within them.

Problems solved by technology

Technological Problem: Magnetocaloric Effective Super Conducers are currently being developed for use in applications such as nuclear magnesis resonance imaging systems or medical devices like MRIs. These types of machines require extremely small currents compared to other electromagnetism techniques used today due to their ability to generate strong fields without causing any issues associated with conventional conductors. This results in lower costs than traditional methods but also allows them to achieve higher performance levels over longer periods of operation.

Method used

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  • Magnesium diboride super conductive material and its preparing method

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Embodiment 1

[0023] Preparation of magnesium diboride strips doped with stearic acid. The ratio of the mass sum of Mg powder (325 mesh, purity not less than 99%) and B powder (amorphous, purity 99.99%) to the mass of stearic acid powder is: MgBy: X=1: 0.111, wherein Mg powder and The molar ratio of B powder component Mg:B=1:2, ie y=2. Dissolve stearic acid powder in alcohol first, then ultrasonically mix the solution with B powder in the above ratio, dry in vacuum, then mix with Mg powder in the above ratio with a mortar, mix evenly, and pack into an iron pipe, swaged, drawn, and rolled to a strip of 0.5mm×4.0mm, sintered and heat-treated in an argon atmosphere at normal pressure, and kept at 800°C for 1 hour to prepare stearic acid-doped bismuth Magnesium boride strip. The critical current density of this magnesium diboride strip can reach 13000A / cm at 4.2K, 10T 2 ; At 14T, the critical current density can reach 2160A / cm 2 .

Embodiment 2

[0025] Preparation of magnesium diboride strips doped with zinc stearate. The ratio of the mass sum of Mg powder (325 mesh, purity not less than 99%) and B powder (amorphous, purity 92%) to the mass of zinc stearate powder is: MgBy:X=1:0.1, wherein Mg powder The molar ratio Mg:B=1:1.9 with B powder component, namely y=1.9. First dissolve the zinc stearate powder in acetone, then ultrasonically mix the solution with the B powder in the above ratio, dry it in vacuum, and then mix it with the Mg powder in the above ratio with a mortar. After mixing evenly, Put it into an iron pipe, swage, draw, and roll to a strip of 0.5mm×4.0mm, carry out sintering heat treatment in an argon atmosphere at normal pressure, and keep it at 850°C for 0.5 hours to prepare a strip containing doped zinc stearate Magnesium diboride strip. The critical current density of this magnesium diboride strip can reach 20000A / cm at 4.2K, 10T 2 ; At 14T, the critical current density can reach 3100A / cm 2 .

Embodiment 3

[0027] Magnesium diboride strips doped with magnesium stearate were prepared. The ratio of the mass sum of Mg powder (325 mesh, purity not less than 99%) and B powder (amorphous, purity 98%) to the mass of magnesium stearate powder is: MgBy: X=1: 0.08, wherein Mg and The molar ratio of B component Mg:B=1:2.1, ie y=2.1. Dissolve the magnesium stearate powder in acetone first, then mix the solution with the B powder in the above ratio through ultrasonic mixing, dry it in vacuum, and then mix it with the Mg powder in the above ratio by using a mortar. After mixing evenly, put it into an iron pipe, swage, draw, and roll to a strip of 0.5mm×4.0mm, sinter heat treatment in an atmosphere of argon at normal pressure, and keep it at 900°C for 0.1 hour to prepare a strip containing dopant. Magnesium diboride strip of magnesium stearate. The critical current density of this magnesium diboride strip can reach 2600A / cm at 4.2K, 14T 2 .

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Abstract

This invention relates to MgB2 superconduction material and its preparing method characterizing in doping with one or many compounds X selected from fatty acid, its ramification and its fatty acid salt, in which, the mol ratio of Mg and B is Mg: B=1: y, and y=1-2.5, the mass ratio of the mass sum of Mg and B components to the doped material X is: MgBy:X=1 : (0.01-1). The method for preparing the material includes: mixing Mg powder, X and B powder uniformly in proportion to be sintered under normal pressure of argon or vacuum, and the material has advanced superconductive property, high critical current property, high critical field and non-inverted field under over 4.2K.

Description

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Claims

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Application Information

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Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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