a mgb 2 Preparation method of multi-core superconducting wire

A superconducting wire and wire technology, applied in the usage of superconductor elements, cable/conductor manufacturing, superconducting devices, etc., can solve the problems of core wire barrier layer rupture, broken core and broken wire, etc. Improve ovality and dimensional deviation, complete shape effect

Active Publication Date: 2019-08-06
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method uses a combination of drawing and roll die drawing to solve the problem of MgB 2 During the processing of multi-core superconducting wires, the problems of core wire barrier layer rupture, core breakage and wire breakage caused by uneven deformation between core wires have improved the MgB 2 The product quality of multi-core superconducting wires ensures that MgB 2 Superconducting properties of multi-core superconducting wires

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment includes the following steps:

[0022] Step 1. Mix magnesium powder and boron powder evenly under the protection of argon according to the molar ratio of 1:2, and then put them into a Cu / NbZr composite tube with an outer diameter of 15mm, an inner diameter of 12mm, and a length of 1.5m to obtain For the tube complex, the tube-packing complex is subjected to 8 passes for the first drawing, and the drawing dies used are: Φ14.2mm, Φ13.5mm, Φ12.8mm, Φ12.2mm, S11.5mm, S11mm, S10.5mm and S10mm, where Φ represents the diameter of the circular drawing die, S represents the distance across the sides of the hexagonal die, and finally a single-core wire with a regular hexagonal cross-section is obtained, and the distance across the sides of the regular hexagon is 10mm;

[0023] Step 2. The single-core wires obtained in step 1 are sequentially cut to length, cut off, straightened and pickled, and then 6 single-core wires with a length of 1.5m after pickling and 1 Cu...

Embodiment 2

[0028] This embodiment includes the following steps:

[0029]Step 1. Mix magnesium powder and boron powder evenly under the protection of argon according to the molar ratio of 1:2, and then put them into a Cu / NbZr composite tube with an outer diameter of 10mm, an inner diameter of 7mm, and a length of 1m to obtain a packed tube Composite, the first drawing of the tube-packing complex is carried out in 18 passes, and the drawing dies used are Φ9.4mm, Φ8.8mm, Φ8.3mm, Φ7.8mm, Φ7.3mm, Φ6.8mm, Φ6.4mm, Φ6.0mm, Φ5.6mm, Φ5.3mm, Φ5.0mm, Φ4.7mm, Φ4.4mm, Φ4.1mm, Φ3.8mm, S3.4mm, S3.2mm and S3.0mm, where Φ Indicates the diameter of the circular drawing die, S represents the distance across the sides of the hexagonal die, and finally obtains a single-core wire with a regular hexagonal cross-section, and the distance across the sides of the regular hexagon is 3mm;

[0030] Step 2. The single-core wires obtained in step 1 are cut to length, cut off, straightened and pickled sequentially, and...

Embodiment 3

[0036] This embodiment includes the following steps:

[0037] Step 1. Mix magnesium powder and boron powder evenly under the protection of argon according to the molar ratio of 1:2, and then put them into a Cu / Nb composite tube with an outer diameter of 13mm, an inner diameter of 11mm, and a length of 1.5m to obtain For the pipe complex, the first drawing of the pipe-packing complex is carried out in 17 passes, and the drawing dies used are: Φ12.0mm, Φ11.1mm, Φ10.2mm, Φ9.4mm, Φ8.7mm, Φ8. 0mm, Φ7.4mm, Φ6.8mm, Φ6.3mm, Φ5.8mm, Φ5.35mm, Φ4.93mm, S4.73mm, S4.54mm, S4.35mm, S4.17mm and S4.0mm, where Φ means circle The diameter of the drawing die, S represents the distance across the sides of the hexagonal die, and finally obtains a single-core wire with a regular hexagonal cross-section, and the distance across the sides of the regular hexagon is 4mm;

[0038] Step 2. The single-core wires obtained in step 1 are cut to length, cut off, straightened and pickled sequentially, and the...

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Abstract

The invention discloses a preparation method of a MgB2 multi-core superconducting wire. The preparation method comprises the following steps of 1, mixing magnesium powder and boron powder to uniform and loading the mixture into a sleeve, obtaining a single-core wire through performing a plurality of times of first drawing; 2, performing dimension fixing, cutting, straightening and pickling on thesingle-core wire, then assembling the single-core wire and a Cu / Nb composite rod with the same dimension into an oxygen-free copper pipe, thereby obtaining a copper pipe assembly; 3, successively performing a plurality of times of second drawing, a plurality of times of roller mold stretching and a plurality of times of third drawing on the copper pipe assembly; and 4, performing sintering processing on the copper pipe assembly after the third drawing, and finally obtaining the MgB2 multi-core superconducting wire. According to the preparation method, a process in which drawing and roller moldstretching are combined is utilized, thereby settling problems of core wire blocking layer rupture, core breakage and wire breakage caused by non-uniform deformation between core wires in the machining process of the MgB2 multi-core superconducting wire, improving product quality of the MgB2 multi-core superconducting wire and ensuring high superconducting performance of the MgB2 multi-core superconducting wire.

Description

technical field [0001] The invention belongs to the technical field of preparation of superconducting materials, in particular to a MgB 2 A method for preparing a multi-core superconducting wire. Background technique [0002] MgB 2 It is a metal compound with high-temperature superconducting properties, and its critical transition temperature (Tc) is 39K. It has broad application prospects in the fields of electronics, electricity, machinery and national defense. MgB 2 It is a brittle compound with similar properties to ceramics. It has no processing plasticity and cannot be directly processed into wire strips. It usually needs to be coated with metal before processing. Currently the most common MgB 2 The wire preparation method is the in-situ powder tube method (in-situ PIT). First, Mg powder and B powder are mixed evenly according to a certain stoichiometric ratio, and then filled into the protective sleeve, and then the filled sleeve is processed. to final size and f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B12/10H01B13/00
CPCH01B12/10H01B13/00H01B13/0006H01B13/0016Y02E40/60
Inventor 王庆阳闫果熊晓梅郗丹杨芳王大友李成山冯勇张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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