Method for preparing single-core MgB2 superconducting line/strip

A superconducting wire and single-core technology, applied in cable/conductor manufacturing, electrical components, circuits, etc., can solve the problem that the critical current density of the wire/strip cannot be significantly improved, dopants are difficult to play a role, and equipment conditions are very demanding. Advanced problems, achieve good chemical inertness, increase critical current density, and increase surface activity
CN104091650AActive Publication Date: 2014-10-08NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
Publication Date
2014-10-08

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Abstract

The invention discloses a method for preparing a single-core MgB2 superconducting line / strip. The method comprises the steps that (1) mixed powder is prepared; (2) high-energy ball milling is conducted on the mixed powder, so that precursor powder is obtained; (3) the precursor powder is contained in a composite metal tube, so that a filled tube composite body is manufactured; (4) rotary forging and drawing are conducted, so that a single-core line is obtained; (5) vacuum sintering is conducted, so that the single-core MgB2 superconducting line is obtained or after the single-core line is rolled into a strip, vacuum sintering is conducted on the strip, so that the single-core MgB2 superconducting strip is obtained. According to method for preparing the single-core MgB2 superconducting line / strip, firstly, heat treatment with high temperature is conducted on powder raw materials, it can be guaranteed that TiB2 generated after a reaction is evenly distributed on a crystal boundary, and therefore the critical current density of the MgB2 superconducting line / strip can be increased easily; secondly, due to the fact that crystal grains are further refined through high-energy ball mining, the density of a superconducting core wire is increased easily and the connectivity of MgB2 crystal grains is improved easily; thirdly, more crystal boundaries formed by grain refinement can form a pinning center, and therefore the critical current density of the line / strip is increased further.
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Description

technical field

[0001] The invention belongs to the technical field of superconducting material processing engineering, in particular to a single-core MgB 2 Method for the preparation of superconducting wires / tapes. Background technique

[0002] MgB 2 Since the superconductor was discovered in 2001, due to its critical temperature of 39K, its advantages such as large coherence length and no weak connection of grain boundaries, it has attracted the attention of scientists at home and abroad. Miscellaneous is to increase MgB 2 Wire under magnetic field J c The most performance-efficient method. When Ti is doped, Ti reacts with B to form nano-sized TiB 2 Distributed in MgB 2 The grain boundary becomes an effective pinning center, which can significantly refine the grain and improve the grain connectivity, thus increasing the MgB 2 Critical current density at high field.

[0003] Currently using PIT technology to process MgB 2 There are two main technical routes for wir...

Claims

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