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Method for manufacturing multi-core MgB2 superconductive wires through extrusion technology

A technology of superconducting wire and process, applied in cable/conductor manufacturing, electrical components, circuits, etc., can solve problems such as reducing connectivity performance, reducing effective current-carrying area of ​​superconducting current, etc., to improve connectivity and increase engineering critical current. Density, the effect of avoiding lateral deformation

Active Publication Date: 2014-10-08
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this traditional in-situ PIT process, due to the influence of the intrinsic characteristics of the chemical phase formation reaction of the Mg-B system, the final formed MgB 2 There are more honeycomb holes in the superconducting phase
The presence of these pores reduces the MgB 2 The connectivity between the grains reduces the effective current-carrying area of ​​the superconducting current, thereby inhibiting the MgB 2 The superconducting current transport performance of composite wires has become a constraint for MgB 2 One of the "bottlenecks" in the practical development of superconducting materials

Method used

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  • Method for manufacturing multi-core MgB2 superconductive wires through extrusion technology
  • Method for manufacturing multi-core MgB2 superconductive wires through extrusion technology
  • Method for manufacturing multi-core MgB2 superconductive wires through extrusion technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1. In a vacuum glove box, under the protection of an argon atmosphere, mix magnesium powder, amorphous boron powder and doping powder according to the molar ratio of Mg:B:doping powder=1:1.92:0.08, and then grind and mix The precursor powder is obtained after uniformity, the doped powder is silicon carbide, the mass purity of the magnesium powder is not less than 99%, the particle size of the magnesium powder is -325 mesh, and the mass purity of the amorphous boron powder is not less than 99%, The particle size of the amorphous boron powder is 0.1 μm to 1 μm, the mass purity of the doped powder is not less than 99%, and the particle size of the doped powder is 1 μm to 10 μm;

[0028] Step 2. Put the precursor powder described in step 1 into a Nb / Cu composite casing with an outer diameter of 15 mm and an inner diameter of 10 mm to obtain a primary composite, and then process the primary composite in 15% passes 2 passes of high-speed drawing, and then 2 passes at a p...

Embodiment 2

[0039] Step 1. In a vacuum glove box, under the protection condition of argon atmosphere, the magnesium powder, amorphous boron powder and doping powder are mixed according to the molar ratio of Mg:B:doping powder=1:1.90:0.10, and then ground and mixed The precursor powder is obtained after uniformity, the doped powder is titanium carbide, the mass purity of the magnesium powder is not less than 99%, the particle size of the magnesium powder is -325 mesh, and the mass purity of the amorphous boron powder is not less than 99%, The particle size of the amorphous boron powder is 0.1 μm to 1 μm, the mass purity of the doped powder is not less than 99%, and the particle size of the doped powder is 1 μm to 10 μm;

[0040] Step 2. Put the precursor powder described in step 1 into a Nb / Cu composite casing with an outer diameter of 15 mm and an inner diameter of 8 mm to obtain a primary composite, and then process the primary composite in 12% passes Draw and process 4 times at a high r...

Embodiment 3

[0046] Step 1. In a vacuum glove box, under the protection of an argon atmosphere, mix magnesium powder, amorphous boron powder and doping powder according to the molar ratio of Mg:B:doping powder=1:1.95:0.05, and then grind and mix The precursor powder is obtained after uniformity, the doping powder is activated carbon, the mass purity of the magnesium powder is not less than 99%, the particle size of the magnesium powder is -325 mesh, and the mass purity of the amorphous boron powder is not less than 99%. The particle size of the shaped boron powder is 0.1 μm to 1 μm, the mass purity of the doped powder is not less than 99%, and the particle size of the doped powder is 1 μm to 10 μm;

[0047] Step 2. Put the precursor powder described in step 1 into a Nb / Cu composite casing with an outer diameter of 18mm and an inner diameter of 10mm to obtain a primary composite, and then process the primary composite in 13% passes 1 pass of high-speed drawing, and then 2 passes at a proces...

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Abstract

The invention discloses a method for manufacturing multi-core MgB2 superconductive wires through the extrusion technology. The method includes the steps that first, precursor powder is prepared; second, the precursor powder is installed in a pipe to prepare a primary complex, and single-core wires are obtained through drawing machining; third, the precursor powder is installed in a pipe to prepare a secondary complex; fourth, the secondary complex processed through pre-heating seal welding is extruded, and multi-core rods are obtained; fifth, the multi-core rods are stripped and drawn to obtain multi-core wires, the multi-core wires are subjected to heat treatment, and then the multi-core MgB2 superconductive wires are obtained. According to the method, on the basis of a traditional power pipe-installing technology, a large single-pass machining deformation amount is adopted for manufacturing the multi-core MgB2 superconductive wires, in other words, the extrusion technology is adopted for manufacturing the multi-core MgB2 superconductive wires, because the secondary complex is in a very favorable three-dimensional stress state in extrusion, good metallurgical bonding will be achieved between different metal interfaces in the secondary complex along with the large extrusion deformation amount, the manufactured multi-core rods are high in composite strength, and the compactness and the yield strength of the multi-core MgB2 superconductive wires can be significantly improved.

Description

technical field [0001] The invention belongs to the technical field of superconducting wire strip processing, in particular to an extrusion process for preparing multi-core MgB 2 method of superconducting wires. Background technique [0002] The superconductivity of the magnesium diboride material was first discovered by Japanese scientists. The material is a non-metallic compound with a simple binary structure. The superconducting critical transition temperature (T c ) is about 39K, which is a simple binary compound with the highest superconducting critical transition temperature at present. At the beginning of its discovery of superconductivity, it aroused great enthusiasm from scientists in the fields of theoretical physics and practical applications all over the world. against MgB 2 In the field of wire and strip research for superconductor strong electric applications, the research on its forming technology has made great progress. Researchers from all over the world ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00
Inventor 王庆阳闫果焦高峰熊晓梅杨芳刘国庆冯建情李成山冯勇张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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