Method for preparing magnesium diboride superconductive wire and strip

A magnesium diboride and superconducting wire technology, which is applied in the usage of superconducting elements, boron/boride, metal boride, etc., can solve problems such as poor compactness, affecting material superconductivity, and uneven cross-section

Inactive Publication Date: 2010-12-22
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MgB prepared by this method 2 Compared with its precursor powder, there is a volume shrinkage of about 30%, and these shrinkage spaces will become holes and remain in the generated MgB 2 inside the superconducting material, thus the MgB 2 The superconducting material forms a large number of shrinkage cavities, making the prepared MgB 2 The highest density of superconducting materials can only reach about 49% of the theoretical density, the compactness is poor, and the cross-section of superconducting materials is uneven due to the existence of a large number of holes, which seriously affects the MgB 2 Improvement of material superconductivity

Method used

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  • Method for preparing magnesium diboride superconductive wire and strip
  • Method for preparing magnesium diboride superconductive wire and strip
  • Method for preparing magnesium diboride superconductive wire and strip

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Experimental program
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specific Embodiment approach

[0030] A kind of specific embodiment of the present invention is:

[0031] a. Preparation of precursor powder: Take 0.397g of Mg and 0.471g of B powder, the stoichiometric ratio of Mg and B is 1:3, and mix the Mg powder and B powder evenly by grinding.

[0032] b. Load the magnesium tube: fill the precursor powder in step a into the Mg tube with an inner diameter of 4 mm and an outer diameter of 8 mm, and press it tightly; then seal both ends of the Mg tube.

[0033]c. Put into the sheath tube: put the Mg tube into the metal Cu sheath tube with an inner diameter of 10mm and an outer diameter of 14mm, and fill the gap with Nb powder with high melting point as a barrier layer; then seal both ends of the Cu tube .

[0034] d. Forming treatment: the Cu tube is drawn and processed, and the amount of deformation is 5% each time; finally, the outer diameter of the Cu tube is kept at 7mm, and drawn into a wire.

[0035] e. Heat treatment: put the Cu-clad wire into a tube furnace, an...

Embodiment 2

[0038] a, preparation of precursor powder: 0.735g MgB 4 powder and 0.143g toluene (C 7 h 8 , liquid state) into a sufficient amount of acetone, thoroughly mixed by ultrasonic dispersion, and then heated to 60°C in a vacuum oven to obtain a toluene-doped precursor powder after removing the acetone. The stoichiometric ratio of boron to dopant toluene was 1:0.036.

[0039] b. Load the magnesium tube: put the precursor powder into the Mg tube with an inner diameter of 4 mm and an outer diameter of 8 mm, and seal both ends of the Mg tube after pressing.

[0040] c. Put into the sheath tube: put the Mg tube into the metal Zr sheath tube with an inner diameter of 10mm and an outer diameter of 14mm, and fill the gap with metal W powder as a barrier layer; then seal both ends of the Zr tube.

[0041] d. Forming treatment: the Zr tube is subjected to drawing processing, and the deformation amount is 5% each time; finally, the outer diameter of the Zr tube is kept at 5 mm.

[0042] e...

Embodiment 3

[0045] a, preparation of precursor powder: take 0.471g B, 0.176g Mg and 0.037g praseodymium oxide (Pr 6 o 11 ), fully mixed uniformly by ultrasonic dispersion method, wherein the stoichiometric ratio of magnesium and boron is 1:6; the stoichiometric ratio of boron and dopant praseodymium oxide is 1:0.001.

[0046] b. Load the magnesium tube: fill it into a Mg tube with an inner diameter of 4mm and an outer diameter of 8mm, and press it tightly; then seal both ends of the Mg tube.

[0047] c. Putting into the casing tube: put the Mg tube into a stainless steel tube with an inner diameter of 10 mm and an outer diameter of 14 mm, and fill the gap with Ti powder; then seal both ends of the stainless steel tube.

[0048] d. Forming treatment: the stainless steel pipe is subjected to drawing processing, and the amount of deformation is 5% each time; finally, the outer diameter of the stainless steel pipe is kept at 3mm.

[0049] e. Heat treatment: put the stainless steel tube into...

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Abstract

The invention relates to a method for preparing a magnesium boride superconducting line and belt material. The preparation method is that a. preparation of precursor powder: high magnesium diboride MgBx powder is taken as the precursor powder, wherein, x is more than or equal to 4 and less than or equal to 12; or magnesium powder and amorphism boron powder are mixed according to 1:3-20 of stoichiometric ratio between magnesium and boron to form the precursor powder; b. putting into a magnesium pipe: the precursor powder is put into a magnesium pipe, compacted and sealed; c. putting into a canning pipe: the magnesium pipe is put into a metal canning pipe and is sealed after the metal canning pipe is fully filled with metal powder as a barrier layer; or the magnesium pipe is first put into a barrier layer metal pipe and then is put into the metal canning pipe and the metal canning pipe is sealed; d. moulding treatment: the metal canning pipe is produced into line and belt material; e. heat treatment: the metal canning pipe is put into a pipe typed furnace and under the protection of argon, the temperature is raised to 700-1200 DEG C by the speed of 1-10 DEG C / minute, preserved for 1-30 hours and then cooled to room temperature. The MgB2 superconducting line and belt material prepared by the method has high compactability, good grain connectivity and even cross section.

Description

technical field [0001] The invention relates to a preparation method of a superconducting material, in particular to a preparation method of a magnesium diboride superconducting material. Background technique [0002] The preparation of high-efficiency and high-quality superconducting wire strips is the basis for the development of superconducting power, superconducting magnets, superconducting energy storage and other applications in the 21st century. Magnesium diboride (MgB 2 ) superconducting materials are considered to have great market potential in future medical nuclear magnetic resonance superconducting magnet (MRI) applications. With MgB 2 The performance of superconducting materials has been further improved. At present, under the conditions of 4.2K and 12T, its critical current density has exceeded 2×10 4 A / cm 2 ; At 20K temperature, the irreversible field (H irr ) has also reached 10T, which can be compared with the traditional superconducting material NbTi / N...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C01B35/04H01B12/00
CPCY02E40/64Y02E40/60
Inventor 潘熙锋赵勇杨烨周杰俤
Owner SOUTHWEST JIAOTONG UNIV
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