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Method for preparing multicore MgB2 superconductive wire material

A superconducting wire and single-core technology, applied in the manufacture/processing of superconductor devices, superconducting devices, electrical components, etc., can solve the problems of limited processing length and processing limit of superconducting wires, and improve uniformity and grain connectivity, high critical current density, and good application prospects

Inactive Publication Date: 2017-05-31
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this invention is to provide a kind of multi-core MgB 2 The preparation method of the superconducting wire solves the limitation of the processing limit of the powder tube process and the complex in the existing method, and the MgB 2 The problem of limited processing length of superconducting wire

Method used

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Examples

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Effect test

preparation example Construction

[0021] A kind of preparation method of multi-core MgB2 superconducting wire rod of the present invention, specifically comprises the following steps:

[0022] Step 1. In a vacuum glove box, under inert gas protection conditions, weigh and mix magnesium powder and amorphous boron powder according to the molar ratio of Mg:B≈1:2, and grind them evenly to obtain a precursor powder;

[0023] Step 2, the precursor powder described in step 1 is loaded into the Nb / Cu composite tube to obtain a primary composite body, and the primary composite body is subjected to multi-pass drawing processing, and the deformation amount of the drawing processing pass is 6%-25 %, to obtain a single mandrel;

[0024] Step 3, put the oxygen-free copper rod, 1 Nb / Cu composite rod and 6 or 18 single core rods obtained in step 2 into the oxygen-free copper tube for secondary assembly to obtain a secondary composite body. The specific process is as follows: Place 1 Nb / Cu composite rod in the center of the o...

Embodiment 1

[0030] In a vacuum glove box, magnesium powder and amorphous boron powder were weighed and mixed according to the molar ratio of Mg:B≈1:2 under the protection of inert gas, and the precursor powder was obtained after grinding for 40 minutes; the precursor powder was loaded into Nb / In the Cu composite pipe, the two ends of the composite pipe are sealed with tin plugs to obtain a primary composite body. The primary composite body is drawn for multiple passes with a processing amount of 6% to obtain a regular hexagonal composite. Subcomponents. Cut the subcomponents into 6 sections of equal length, that is, 6 single mandrels, place 1 Nb / Cu composite rod in the center of an oxygen-free copper tube with an inner diameter of Φ30mm, surround 6 single mandrels with 1 The Nb / Cu composite rods are arranged in a ring structure and loaded into the oxygen-free copper tube, and then the gap between the single mandrel and the oxygen-free copper tube is filled with the oxygen-free copper rod...

Embodiment 2

[0034] In a vacuum glove box, magnesium powder and amorphous boron powder were weighed and mixed according to the molar ratio of Mg:B≈1:2 under the protection of inert gas, and the precursor powder was obtained after grinding for 40 minutes; the precursor powder was loaded into Nb / In the Cu composite pipe, the two ends of the composite pipe are sealed with tin plugs to obtain a primary composite body. The primary composite body is drawn for multiple passes with a processing amount of 15% to obtain a regular hexagonal composite. Subcomponents. Cut the subcomponents into 6 sections of equal length, that is, 6 single mandrels, place 1 Nb / Cu composite rod in the center of an oxygen-free copper tube with an inner diameter of Φ100mm, surround 6 single mandrels with 1 The Nb / Cu composite rods are arranged in a ring structure and loaded into the oxygen-free copper tube, and then the gap between the single mandrel and the oxygen-free copper tube is filled with the oxygen-free copper r...

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Abstract

The invention discloses a method for preparing a multicore MgB2 superconductive wire material. The method comprises the specific steps: mixing magnesium powder with amorphous powdered boron so as to obtain precursor powder, loading the precursor powder to a Nb / Cu composite tube, and carrying out drawing, so as to obtain single-core bars; putting non-oxygen copper bars, Nb / Cu composite bars and the single-core bars in an oxygen-free copper tube for secondary assembly, so as to obtain a secondary composite; carrying out static hydraulic extrusion on the secondary composite, so as to obtain a multicore bar material; carrying out drawing on the multicore bar material so as to obtain a multicore wire material, and carrying out heat treatment, thereby obtaining the multicore MgB2 superconductive wire material. According to the method, the multicore MgB2 superconductive wire material is prepared by adopting a static hydraulic extrusion process on the basis of the traditional powder tubing method, so that the density of powder in core wires is remarkably improved, meanwhile, the uniformity and crystal grain connectivity of the core wires are improved, and the obtaining of high critical current density is facilitated. The method is simple in process, is applicable to the preparation of MgB2 superconductive wire material with the length of greater than 2,000 meters and has a very good application prospect.

Description

technical field [0001] The invention belongs to the technical field of superconducting wire preparation, in particular to a multi-core MgB 2 Preparation method of superconducting wire. Background technique [0002] The critical temperature of magnesium diboride superconductor is 39K, and it has the advantages of large coherence length and no weak connection of grain boundary. To meet MgB 2 To meet the practical requirements of superconducting wires, several superconducting material research and development teams aim at improving the MgB 2 Much research has been done on the length and properties of superconducting wires. At present, the kilometer-level MgB can be prepared by the powder-in-tube method (PIT). 2 Superconducting long wires, but still not fully meet the application requirements, how to continue to increase the length of a single wire is still an important research direction. However, the length of the wire prepared by the PIT method is limited by the powder t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L39/24H10N60/01
CPCH10N60/0856
Inventor 冯勇闫果王大友潘熙锋崔利军张平祥刘向宏秦星郗丹候艳荣
Owner 西部超导材料科技股份有限公司
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