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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 the problems of uneven cross-section, affecting the superconducting performance of materials, and poor compactness

Inactive Publication Date: 2008-10-08
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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Effect test

specific Embodiment approach

[0030] A specific implementation of the present invention is:

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

[0032] b. Load the magnesium tube: fill the precursor powder of step a 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.

[0033]c. Insert the sheathing tube: insert the Mg tube into a metal Cu sheathing tube with an inner diameter of 10mm and an outer diameter of 14mm, and fill the gap with high melting point Nb powder 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 deformation amount is 5% each time; finally, the outer diameter of the Cu tube is maintained at 7mm, and the Cu tube is drawn into a wire.

[0035] e. Heat treatment: Put the Cu-coated wire into a tube furnace,...

Embodiment 2

[0038] a. Preparation of precursor powder: 0.735g MgB 4 Powder and 0.143g toluene (C 7 H 8 , Liquid) is poured into a sufficient amount of acetone, mixed thoroughly with an ultrasonic dispersion method, and then heated to 60° C. in a vacuum drying oven to obtain a toluene-doped precursor powder after removing the acetone. The stoichiometric ratio of boron to dopant toluene is 1:0.036.

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

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

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

[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 ), using an ultrasonic dispersion method to fully mix uniformly, wherein the stoichiometric ratio of magnesium to boron is 1:6; the stoichiometric ratio of boron to the dopant praseodymium oxide is 1:0.001.

[0046] b. Insert 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. Put into the casing tube: Put the Mg tube into a stainless steel tube with an inner diameter of 10mm and an outer diameter of 14mm, and fill the gap with Ti powder; then seal both ends of the stainless steel tube.

[0048] d. Forming treatment: The stainless steel tube is drawn and processed, and the deformation amount is 5% each time; finally, the outer diameter of the stainless steel tube is kept at 3mm.

[0049] e. Heat treatment: Put the stainless steel tube into a tube furnace...

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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 21st century superconductivity, superconducting magnets, superconducting energy storage and other applications. Magnesium Diboride (MgB 2 ) Superconducting materials are considered to have huge market potential in future medical MRI applications. With MgB 2 The performance of superconducting materials has been further improved. At present, under the conditions of 4.2K and 12T, the critical current density has exceeded 2×10. 4 A / cm 2 ; At 20K temperature, irreversible field (H irr ) Has also reached 10T, which can be compared with the traditional superconducting material NbTi / Nb 3 Sn is comparable. [0003] Existing MgB 2 Preparation methods of supercon...

Claims

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Application Information

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