Method for producing hollow superconducting cables
AssigneesAgency of Industrial Science and Technology, The Fujikura Cable Works, Ltd.
InventorsKo Agatsuma, Kenichi Koyama, Itaru Todoriki, Tetsuo Yamaguchi, Osamu Kohno, Takashi Saito
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Abstract
A method for producing hollow superconducting cable comprises steps of providing grooves on the outer periphery of a hollow conductor adapted to be engageable therewithin fine multi-filamentary superconductors formed beforehand to be fitted into said grooves, and of fixing securely said multi-filamentary superconductors into said grooves by soldering with a metal having a low melting point.
Claims10
In a method of producing hollow superconducting cables, comprising taking an elongated hollow conductor of normally conducting material, the periphery of which is provided in its lengthwise direction with at least one groove penetrating part-way towards the longitudinal axis of the hollow conductor, and locating within said groove a multifilament superconductor extending along the length of said groove, the improvement wherein the multifilament superconductor to be located in said groove is made beforehand by the steps of:
- (a) forming a multiplicity of composite wires, each composite wire containing at least two metallic elements that are mutually diffusible upon diffusion heat treatment to become a superconducting intermetallic compound;
- (b) braiding respective pluralities of said composite wires together to form a braided sleeve;
- (c) deforming said braided sleeve to provide it with the cross-sectional profile of said groove;
- and
- (d) subjecting said at least two metallic elements of the composite wires in the deformed braided sleeve to diffusion heat treatment causing said elements mutually to diffuse and become said superconducting intermetallic compound, thereby transforming said deformed braided sleeve into the multifilament superconductor to be located in said groove.
Dependencies are inferred from the claim text.