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Superconducting tape suitable for non-insulated coils, non-insulated coils and preparation method thereof

A technology of superconducting tape without insulation, which is applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., and can solve the problems of tape length fluctuation, batch product quality unevenness, and tape damage and other problems to achieve the effect of preventing axial sliding offset

Active Publication Date: 2021-07-30
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current workaround is: figure 2 As shown, during the winding process, baffles are set on both sides of the strip to limit and clamp, but it is easy to cause the edge part of the strip in contact with the baffle to be bent outward, which will cause damage to the strip. In addition, the strip length consumed by winding multiple coils with the same number of turns after crimping will also fluctuate greatly, resulting in uneven quality of batch products

Method used

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  • Superconducting tape suitable for non-insulated coils, non-insulated coils and preparation method thereof
  • Superconducting tape suitable for non-insulated coils, non-insulated coils and preparation method thereof
  • Superconducting tape suitable for non-insulated coils, non-insulated coils and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment one, metal coating:

[0036] The protective layer 3 is a metal coating on the outside of the superconducting strip 1 by means of physical vapor deposition, and the metal coating may be a copper layer.

[0037] The Cu layer was prepared under the conditions of intermediate frequency magnetron sputtering, power=2.5KW, argon gas=40sccm, pressure=5mTorr, and target-base distance=7cm.

[0038] The obtained strip surface Pa is approximately equal to 200nm.

Embodiment 2

[0039] Embodiment two, metal coating:

[0040] The protective layer 3 is a metal coating on the outside of the superconducting strip 1 by electrochemical means, and the metal coating can be a copper layer.

[0041] Add a surface roughening agent into the original electroless copper plating tank for copper plating.

[0042] The obtained strip surface Pa is approximately equal to 200nm.

Embodiment 3

[0043] Embodiment three, encapsulation layer:

[0044] The protective layer 3 forms an encapsulation layer for encapsulation on the outside of the superconducting tape, and the equipment used for encapsulation can refer to the patent document CN 201710416026.8 "A Superconducting Tape Encapsulation Device".

[0045] Using 6337 solder, at a temperature of 220°C, the upper cladding strip, the superconducting strip and the lower cladding strip are simultaneously pulled into a tin furnace for extrusion molding and then pulled out.

[0046] The obtained strip surface Pa is approximately equal to 150nm.

[0047] The invention also provides a non-insulated coil, which includes a superconducting strip wound into a non-insulated coil, and a protective layer is arranged on the outer side of the superconducting strip, and the surface roughness of the protective layer is greater than Pa.

[0048] The protective layer includes: a metal plating layer or an encapsulation layer, and the metal...

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Abstract

The invention provides a superconducting strip suitable for non-insulated coils, a non-insulated coil and a preparation method thereof. The outer side of the superconducting strip is coated with a protective layer, and the surface roughness of the protective layer is greater than a preset value. The protective layer with a certain roughness is arranged on the outer layer of the strip material of the present invention, so that during the pre-tightening process of winding the non-insulated coil, the axial sliding of the strip material can be effectively prevented by the mutual friction between the protective layers of each turn Misalignment; by means of physical vapor deposition or encapsulation, the "bone-type" structure of the cross-section of the strip is avoided, and no grinding process is required.

Description

technical field [0001] The invention relates to the field of superconducting materials, in particular to a superconducting strip suitable for non-insulated coils, non-insulated coils and a preparation method thereof. Background technique [0002] In 2011, Hahn proposed the concept of superconducting uninsulated coils. In this kind of coil, the inter-turn insulation of the coil is banned, that is, the surface of the superconducting strip for preparing the coil is not sprayed with insulating substances. This non-insulated superconducting coil between turns avoids the potential damage to the magnet caused by the quench phenomenon accompanying the insulated superconducting magnet. During the preparation of non-insulated superconducting coils, non-insulating materials with certain conductivity are filled between adjacent superconducting strips. Once the non-insulated coil is quenched, the quench current can flow through the adjacent layers, so as to ensure the normal operation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B12/04
CPCH01B12/04Y02E40/60
Inventor 朱佳敏张超程春生甄水亮张智巍吴蔚陈思侃赵跃
Owner SHANGHAI JIAO TONG UNIV
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