高温超電導材料の最近の進展

概要

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Since high-T_c superconducting materials were first discovered, there has been much research on materials, and several practical materials have been developed. It is remarkable that Ag sheathed Bi tapes have reached the application stage and superconducting magnets which generate 7 T at 20 K have been realized. Various small scale electric power systems using these Bi tape conductors are now being developed. However, because of the low critical field (irreversible field) at 77K, the applications are limited, and development of nextgeneration conductors with large current carrying capability even at 77 K in strong fields are desired. For bulk materials, the trapped field has reached 2.1 T at 77 K. Nevertheless, further improvements in the trapped field and other characteristics are required for actual applications such as flywheel-type electric power storage systems. In this review, we describe several basic problems in realizing practical conductors and bulk materials, and report on recent progress in the fabrication processes of these materials and in their applications.
社団法人日本磁気学会の論文
1999-01-01