Patent Number: 6,305,069

Title: Method of preparing oxide superconductive wire

Abstract: Provided are an oxide superconducting wire which maintains a high critical current density and has a small current drift with small ac loss when the same carries an alternating current and a method of preparing the same, and a cable conductor which is formed by assembling such oxide superconducting wires. The oxide superconducting wire is a flat-molded stranded wire which is formed by twisting a plurality of metal-coated strands consisting of an oxide superconductor, and is characterized in that the flat-molded stranded wire has a rectangular sectional shape, and a section of each strand forming the flat-molded stranded wire has an aspect ratio (W1/T1) of at least 2. The method of preparing this oxide superconducting wire comprises the steps of preparing a stranded wire by twisting a plurality of strands, each of which is formed by metal-coating an oxide superconductor or raw material powder therefor, flat-molding the prepared stranded wire, and repeating rolling and a heat treatment of at least C. on the flat molded stranded wire a plurality of times.

Inventors: Fujikami; Jun (Osaka, JP), Saga; Nobuhiro (Osaka, JP), Ohmatsu; Kazuya (Osaka, JP), Sato; Kenichi (Osaka, JP)

Assignee: Sumitomo Electric Industries, Inc.

International Classification: C23C 26/00 (20060101); C23C 30/00 (20060101); H01L 39/24 (20060101); H01L 39/14 (20060101); H01L 039/24 ()

Expiration Date: 10/23/2018