Abstract: Powder having a composition in which the contents of Sr, Ca and Cu are increased so that an Sr-Ca-Cu-O phase is precipitated in addition to a 2223 phase of (Bi, Pb)-Sr-Ca-Cu is charged in a metal sheath, and this metal sheath is plastic-worked, then subjected to a primary heat treatment, then plastic-worked and further subjected to a secondary heat treatment. In the as-obtained bismuth oxide superconducting wire, pinning points based on the Sr-Ca-Cu-O phase are introduced into the superconductor, whereby magnetic field characteristic of the critical current density is improved.
Type:
Grant
Filed:
November 28, 1994
Date of Patent:
September 3, 1996
Assignees:
Sumitomo Electric Industries, Ltd., Director General of National Research Institute for Metals of Science and Technology Agency of Japan, Research Development Corporation of Japan