Superconducting wire

A technology of superconducting wires and oxide superconducting layers, applied in the field of superconducting wires, can solve the problems of rising manufacturing costs and lowering yield of superconducting wires, and achieve the effects of high critical current, good surface smoothness, and high adhesion strength

Active Publication Date: 2014-03-12
FURUKAWA ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, the polishing process of the substrate is a major factor leading to an increase in the manufacturing cost of the superconducting wire, and there is a problem that, in mechanical polishing, it is undeniable that the yield decreases due to local poor polishing.

Method used

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Examples

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Embodiment

[0056] In order to study the maximum contour height Rz of the film-forming surface of the substrate 10, the arithmetic mean roughness Ra of the surface of the first intermediate layer 21, the adhesion strength between the first intermediate layer 21 and the substrate 10, and the critical current Ic of the superconducting wire 1 A plurality of samples of the superconducting wire 1 shown in Table 1 were fabricated.

[0057] [Table 1]

[0058]

[0059] >

[0060] The substrate 10 of these superconducting wires 1 was formed by rolling Hastelloy C-276 (registered trademark) to a width of 1 cm and a thickness of 0.1 mm. The maximum contour height Rz of the film-forming surface of the substrate 10 is summarized to 6nm-18nm (6nm, 9nm, 11nm, 14nm, 18nm) by selecting the surface roughness (for example, arithmetic mean roughness Ra) of the rolling roll, etc. Go to 5 groups of ).

[0061] The measurement of the maximum profile height Rz was performed in an area of ​​X×Y=1.54 μm×1.54...

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Abstract

Provided is a superconducting wire which, while maintaining smoothness of a substrate surface and high adhesive strength which can be implemented without carrying out a mechanical polishing, etc., makes it possible to obtain a desirable critical current. A first intermediate layer (21) is formed by coating a substrate (10) having a maximum height roughness (Rz) of 10nm or more with a material solution, surface smoothness of the first intermediate layer (21) is increased, orientation and smoothness of a second intermediate layer (22) which is formed upon the first intermediate layer, and a critical current of an oxide semiconductor layer (30) is increased. Forming the first intermediate layer (21) with a plurality of coated thin film layers (21i), having an uppermost layer coated thin film layer thickness which is thinner than a coated thin film layer thickness of the lowermost layer, and / or the material solution which is used in the uppermost coated thin film layer having a lower viscosity than the material solution which is used in the lowermost coated thin film layer, increases the surface smoothness of the first intermediate layer (21).

Description

technical field [0001] The present invention relates to a superconducting wire with an intermediate layer and a superconducting layer formed on a substrate, in particular to an intermediate layer whose smoothness is better than that of the substrate surface so that good critical current characteristics (high critical current characteristics) can be obtained. current) superconducting wires. Background technique [0002] In order to obtain the required strength, flexibility, etc. as a wire, a general superconducting wire has a structure as follows: for example, a metal tape or the like is used as a substrate, and an oxide layer (one or more layers) is formed on the substrate as an intermediate layer. layer, and then a superconducting layer composed of an oxide superconductor is formed on the intermediate layer, and a protective layer (also called a stabilizing layers). [0003] The critical current in a superconducting wire depends on the in-plane orientation of the supercon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/06H01B13/00
CPCH01L39/2461H01L39/143H01B13/30H10N60/0632H01B12/06H01B13/00H10N60/0128H10N60/01H10N60/855
Inventor 樋口优坂本久树折田伸昭柴山学久
Owner FURUKAWA ELECTRIC CO LTD
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