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A kind of 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 the problems of the influence of superconducting joints on the connection efficiency, high heat treatment temperature, and weak pinning ability, so as to improve the pinning ability. , increase the grain boundary area, reduce the effect of grain size

Active Publication Date: 2020-06-23
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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  • A kind of superconducting joint and preparation method thereof
  • A kind of superconducting joint and preparation method thereof

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Embodiment 1

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

[0047] A superconducting joint, comprising a 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 sheath is a niobium tube. The package is copper foil, and the molar ratio of boron powder and magnesium powder is 2:1.

[0048] A preparation method of the above-mentioned superconducting joint, specifically,

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

Embodiment 2-4

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

[0055] Table 1 Example 2-4 Superconductor types and superconducting connector connection efficiency

[0056] example Types of Superconductors Connected connection efficiency Example 2 Magnesium Diboride Bulk 100％ Example 3 Magnesium Diboride Strip 100％ Example 4 Magnesium diboride film 100％

[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 both the pinning ability and the connection efficiency are better than the superconducting joint prepared by the comparative example. pinning ability.

Embodiment 5

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

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

[0061] A preparation method of the above-mentioned superconducting joint, specifically,

[0062] In the air environment, grind the ends of the two yttrium barium copper oxide superconductor strips 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 end of the superconductor and the boron powder with copper foil, embed it in the magnesium powder, ...

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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, in particular to a superconducting joint and a preparation method thereof. Background technique [0002] Magnesium diboride (MgB) with superconducting transition temperature up to 39K was discovered in 2001 2 ) has the advantages of long superconducting coherence length, high upper critical field, no weak connection between grain boundaries, simple structure, low cost, etc. Broad application prospects, in addition, the above-mentioned properties also make magnesium diboride also used as a contact material for superconducting connection devices. [0003] Currently, MgB is used 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 is used as contact material; the second type is MgB produced by sintering mixed boron powder and magnesium powder 2 As a contact material; the third...

Claims

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Application Information

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Patent Type & Authority Patents(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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