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Superconducting joint and preparation method thereof

A technology of superconducting joints and superconductors, which is applied in the manufacture of contacts, connecting contact materials, and connections. It can solve problems such as weak pinning ability, influence of superconducting joint connection efficiency, and high heat treatment temperature, so as to increase the grain boundary area. , Improve pinning ability and reduce grain size

Active Publication Date: 2019-05-24
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Therefore, the technical problem to be solved in the present invention is to overcome the problem of preparing MgB in the prior art. 2 When the heat treatment temperature is high in the superconducting joint, the prepared MgB 2 The weak pinning ability of the superconducting joint and the connection efficiency of the superconducting joint are affected by the shape of the superconductor, thereby providing a superconducting joint and a preparation method thereof

Method used

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  • Superconducting joint and preparation method thereof

Examples

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Embodiment 1

[0046] This embodiment provides a superconducting joint and a preparation method thereof, specifically as follows:

[0047] A superconducting joint, including magnesium diboride single-core wire, boron powder, magnesium powder, an outer metal sheath and an inner single-layer metal sheath, wherein the outer metal sheath is a niobium tube, and the inner single-layer metal The sheath is copper foil, and the molar ratio of boron powder and magnesium powder is 2:1.

[0048] A method for preparing the above-mentioned superconducting joint, specifically,

[0049] In the air environment, grind the ends of the two magnesium diboride single-core wires that need to be connected to expose the superconducting core, bury it in the boron powder, and compact the boron powder to make the density reach 50% of the theoretical density , wrap the superconductor end and boron powder with copper foil, bury it in magnesium powder, and cover it with niobium tube. After welding the niobium sheath, it ...

Embodiment 2-4

[0054] The preparation process of Example 2-4 is the same as that of Example 1 except that the superconductor materials to be connected are different.

[0055] Table 1 Embodiment 2-4 superconductor type and superconducting connector connection efficiency

[0056] example

[0057] Examples 1-4 are compared with Comparative Examples 1-4 respectively, indicating that the connection efficiency of the superconducting joint prepared by the present invention is not limited by the shape of the superconductor, and the pinning ability and connection efficiency are better than the superconducting joint prepared by the comparative example pinning ability.

Embodiment 5

[0059] This embodiment provides a superconducting joint and a preparation method thereof, specifically as follows:

[0060] A superconducting joint, comprising yttrium-barium-copper-oxygen superconductor strips (the number of superconducting cores is 12), boron powder, magnesium powder, an outer metal sheath and an inner single-layer metal sheath, wherein the outer metal sheath is Niobium tube, the inner single-layer metal sheath is copper foil, the molar ratio of boron powder and magnesium powder is 2:1.

[0061] A method for preparing the above-mentioned superconducting joint, specifically,

[0062] In the air environment, grind the ends of the two yttrium-barium-copper-oxide superconductor strips that need to be connected to expose the superconducting core, bury it in boron powder, and compact the boron powder to make the density reach 50% of the theoretical density , wrap the superconductor end and boron powder with copper foil, bury it in magnesium powder, and cover it w...

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Abstract

The invention belongs to the technical field of superconductor preparation, and specifically relates to a superconducting joint and a preparation method thereof. The superconducting joint comprises boron powder, magnesium powder, superconductors, an outer metal sheath and an inner metal sheath, wherein the superconductors and boron powder are coated by the inner metal sheath, a low-melting-point alloy phase is formed at the junction of the inner metal sheath and the magnesium powder when heat treatment is carried out, a liquid phase can be formed when the temperature is lower than 600 DEG C, and the diffusion rate and reaction rate of magnesium for entering the boron powder are accelerated, so that the reaction of the boron powder and the magnesium powder can be conducted at a temperaturelower than 600 DEG C, the crystal grain size of a product MgB2 is reduced, the crystal boundary area is increased, and thus the pinning ability of MgB2 is improved. In addition, the setting of the inner metal sheath can enable the connection efficiency of the superconducting joint not to be limited by the shape of the superconductors.

Description

technical field [0001] The invention belongs to the technical field of superconductor preparation, and in particular relates to a superconducting joint and a preparation method thereof. Background technique [0002] In 2001, he discovered magnesium diboride (MgB) with a superconducting transition temperature as high as 39K. 2 ) has the advantages of long superconducting coherence length, high upper critical field, no weak connection in grain boundary, simple structure, low cost, etc. In addition, the above characteristics also make magnesium diboride can be used as a contact material for superconducting connection devices. [0003] Currently, using MgB 2 There are three types of preparation methods for superconducting connection devices as contact materials. The first type is to directly use MgB 2 powder as the contact material; the second type is the MgB produced by sintering the mixed boron powder and magnesium powder 2 As a contact material; the third type is MgB form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R4/68H01R13/03H01R43/02H01R43/16
Inventor 王栋樑马衍伟朱炎昌
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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