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Method for preparing Nb3Al superconducting wires on basis of powder-in-tube

A superconducting wire and powder technology, which is applied in the field of preparation of multi-core Nb3Al superconducting wire, can solve the problems of low qualified rate of finished products, wire breaking performance and high preparation cost, and achieves high qualified rate, excellent performance and huge The effect of business value

Inactive Publication Date: 2018-11-13
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Any deviation in any link may lead to the consequences of breaking the wire under high temperature stress or reducing its performance. The qualified rate of the finished product is low and the production cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A Nb based on powder packed tube 3 The preparation method of Al superconducting wire rod, its way is:

[0028] A. Preparation of precursor powder

[0029] Put Nb powder and Al powder in the ratio of atomic ratio 3:1, put them in the ball mill tank of high-energy ball mill and perform ball milling with ball weight ratio of 10:1 for 10 hours to obtain mechanically alloyed precursor powder;

[0030] The particle size of the Nb powder is 400 mesh, the particle size of the Al powder is 400 mesh, and the purity of the Nb powder and the Al powder is above 99.9%;

[0031] B. Preparation of single core wire

[0032] Put the precursor powder into the Nb tube, and then tightly fit the Cu tube on the Nb tube containing the precursor powder to form a Nb-Cu composite cladding tube. The inner diameter of the Nb-Cu composite cladding tube is 10mm; then Nb- The Cu composite sheathed tube is repeatedly drawn, and the processing amount of each drawing is 10%; until the processing amoun...

Embodiment 2

[0040] A Nb based on powder packed tube 3 The preparation method of Al superconducting wire rod, its way is:

[0041] A. Preparation of precursor powder

[0042] Put Nb powder and Al powder in the ratio of atomic ratio 3:1, put them in the ball mill tank of high-energy ball mill and perform ball milling with ball weight ratio of 15:1 for 10 hours to obtain mechanically alloyed precursor powder;

[0043] The particle size of the Nb powder is 300 mesh, the particle size of the Al powder is 300 mesh, and the purity of the Nb powder and the Al powder is above 99.9%;

[0044] B. Preparation of single core wire

[0045] Put the precursor powder into the Nb tube, and then tightly fit the Cu alloy tube on the Nb tube with the precursor powder to form a Nb-Cu composite clad tube. The inner diameter of the Nb-Cu composite clad tube is 50mm; then the Nb The -Cu composite sheathed tube is repeatedly drawn, and the processing amount of each drawing is 15%; until the processing amount of...

Embodiment 3

[0052] A Nb based on powder packed tube 3 The preparation method of Al superconducting wire rod, its way is:

[0053] A. Preparation of precursor powder

[0054] Put Nb powder and Al powder in the ratio of atomic ratio 3:1, put them in the ball mill tank of high-energy ball mill and perform ball milling with ball weight ratio of 5:1 for 3 hours to obtain mechanically alloyed precursor powder;

[0055] The particle size of the Nb powder is 400 mesh, the particle size of the Al powder is 400 mesh, and the purity of the Nb powder and the Al powder is above 99.9%;

[0056] B. Preparation of single core wire

[0057] Put the precursor powder into the Nb tube, and then tightly fit the Cu tube on the Nb tube containing the precursor powder to form a Nb-Cu composite cladding tube. The inner diameter of the Nb-Cu composite cladding tube is 10mm; then Nb- The Cu composite sheathed tube is repeatedly drawn, and the processing amount of each drawing is 10%; until the processing amount ...

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Abstract

The invention discloses a method for preparing Nb3Al superconducting wires on the basis of powder-in-tube. The method includes A, preparing precursor powder, to be more specific, placing Nb powder andAl powder in ball-milling tanks of high-energy ball-milling machines according to an atomic ratio of 3:1 and carrying out ball-milling to obtain the mechanically alloyed precursor powder; B, preparing single-core wires, to be more specific, loading the precursor powder in Nb-Cu composite canning tubes and then repeatedly drawing the Nb-Cu composite canning tubes to allow the processing volumes ofthe Nb-Cu composite canning tubes reach 98% so as to obtain the single-core wires; C, preparing multi-core wires, to be more specific, assembling the single-core wires in Cu tubes or Cu alloy tubes to obtain precursor multi-core wires, and repeatedly drawing the precursor multi-core wires until the processing volumes of the precursor multi-core wires reach 99% so as to obtain the multi-core wires; D, preparing the superconducting wires, to be more specific, carrying out high-pressure and low-temperature heat treatment on the multi-core wires and carrying out superconducting-phase transformation on the multi-core wires to obtain the Nb3Al superconducting wires. The method has the advantage that the Nb3Al superconducting wires prepared by the aid of the method are good in performance, highin qualification rate and low in preparation cost.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of low-temperature superconducting materials, and in particular relates to a multi-core Nb 3 A method for preparing an Al superconducting wire. Background technique [0002] Nb 3 Al is the current superconducting transition temperature (T c ), critical current density (J c ) and upper critical field (H c2 ) and other low-temperature superconducting materials with the best comprehensive practical performance. it with Nb 3 Compared with Sn, the superconducting transition temperature reaches 19.3K, and it also belongs to the A15 structure intermetallic compound and grain boundary pinned superconductor; and has a higher upper critical field and better high-field critical current density characteristics; especially important, It is better than Nb 3 Sn has more excellent stress-strain tolerance characteristics. Therefore Nb 3 Al superconducting wires are considered to have great pot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/00H01B13/00
CPCH01B12/00H01B13/00Y02E40/60
Inventor 孙霞光羊新胜潘熙锋赵勇
Owner SOUTHWEST JIAOTONG UNIV
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