Calcium carbide superconducting wire preparation method

A superconducting wire, calcium carbide technology, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc. Calcium superconducting performance is reduced and other problems, to achieve the effect of improving grain connection performance, high application value and improving superconducting performance

Pending Publication Date: 2021-09-21
SHAANXI INST OF INT TRADE & COMMERCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method uses a mixed reaction of graphite and calcium metal, and calcium intercalation enters graphite to form a superconductor, but metal intercalation is difficult, and it is difficult to obtain samples with saturated intercalation, and the superconductivity of calcium carbide is reduced
At the same time, it is difficult to obtain larger-sized samples by traditional methods, which is not conducive to carrying out applied research and theoretical research.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment includes the following steps:

[0023] Step 1, placing graphene powder and calcium particles in a ball mill jar, and ball milling under the condition of feeding argon to obtain a mixture of graphene and calcium;

[0024] The rotating speed that described ball mill adopts is 600rpm, and the time is 0.5h, and the ratio of milling ball quality and graphene powder and calcium grain total mass is 2:1;

[0025] The atomic ratio of graphene and calcium in the mixture is 1:2;

[0026] Step 2. Put the mixture obtained in step 1 into a glove box and put it into a niobium tube, and then perform a drawing to obtain a single-core wire with a hexagonal cross-section. After the single-core wire is cut off, it is assembled into Copper-clad casing, and then carry out secondary drawing to obtain a multi-core wire with a circular cross section; the pass processing rate of the first drawing and the second drawing is 10%; the cross-section of the single-core wire is The di...

Embodiment 2

[0030] This embodiment includes the following steps:

[0031] Step 1, placing graphene powder and calcium particles in a ball mill jar, and ball milling under the condition of feeding argon to obtain a mixture of graphene and calcium;

[0032] The rotating speed that described ball mill adopts is 50rpm, and the time is 5h, and the ratio of milling ball quality and graphene powder and calcium grain total mass is 0.5:1;

[0033] The atomic ratio of graphene and calcium in the mixture is 1:0.2;

[0034] Step 2. Put the mixture obtained in step 1 into a glove box and put it into a copper tube, and then perform a drawing to obtain a single-core wire with a hexagonal cross-section. After the single-core wire is cut off, it is assembled into Copper-clad casing, and then carry out secondary drawing to obtain a multi-core wire with a circular cross-section; the pass processing rate of the first drawing and the second drawing is 20%; the cross-section of the single-core wire The dista...

Embodiment 3

[0038] This embodiment includes the following steps:

[0039] Step 1, placing graphene powder and calcium particles in a ball mill jar, and ball milling under the condition of feeding argon to obtain a mixture of graphene and calcium;

[0040] The rotating speed that described ball mill adopts is 200rpm, and the time is 2h, and the ratio of milling ball quality and graphene powder and calcium grain total mass is 1:1;

[0041] The atomic ratio of graphene and calcium in the mixture is 1:0.8;

[0042]Step 2. Put the mixture obtained in step 1 into a glove box and put it into a niobium tube, and then perform a drawing to obtain a single-core wire with a hexagonal cross-section. After the single-core wire is cut off, it is assembled into Copper-clad casing, and then carry out secondary drawing to obtain a circular multi-core wire in cross-section; the pass processing rate of the first drawing and the second drawing is 15%; the cross-section of the single-core wire The distance a...

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Abstract

The invention discloses a calcium carbide superconducting wire preparation method, which comprises the steps of 1, placing graphene powder and calcium particles in a ball milling tank, and carrying out ball milling under the protection of high-purity argon to obtain a mixture of graphene and calcium, 2, placing the mixture in a glove box, putting the glove box into a niobium tube or a copper tube, then carrying out primary drawing to obtain a single-core wire, cutting off the single-core wire, then secondarily assembling the single-core wire into a niobium-coated sleeve or a copper-coated sleeve, and then carrying out secondary drawing to obtain a multi-core wire, and 3, carrying out heat treatment on the multi-core wire to obtain the calcium carbide superconducting wire. Graphene and calcium are subjected to ball milling and mixing, then are subjected to drawing by adopting a bundling tubing method, and then are subjected to a heat treatment reaction, so that not only is good flowability of tubing powder ensured, but also the reaction path of a graphene sheet layer and calcium is reduced, and the difficulty that a calcium intercalation layer enters the graphene sheet layer to form a calcium carbide superconductor is reduced; and the superconducting performance of the calcium carbide superconductor is improved.

Description

technical field [0001] The invention belongs to the technical field of superconducting materials, and in particular relates to a preparation method of a calcium carbide superconducting wire. Background technique [0002] Carbon-based superconductors are an important class of superconducting materials in the field of superconductivity research. The study of carbon-based superconducting materials is conducive to a deeper understanding of the nature of superconducting mechanisms. Carbon-based superconducting materials mainly include diamond, graphite, footballene, carbon nanotubes, etc., all of which exhibit superconductivity after doping with impurities. Recently, superconductivity has appeared in the "magic angle" graphene structure, making the research on graphene and superconducting materials one of the research hotspots in the field of new materials. Researchers at the Massachusetts Institute of Technology in the United States used two layers of graphene to combine with a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/02
CPCH01B12/02Y02E40/60
Inventor 唐静
Owner SHAANXI INST OF INT TRADE & COMMERCE
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