Recent R&D progress on DI-BSCCO wires with high critical current properties

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• 作者：Tomohiro Kagiyama^a ; ^{kagiyama-tomohiro@sei.co.jp} ; Shin-ichi Kobayashi^a ; Kouhei Yamazaki^a ; Masashi Kikuchi^a ; Satoru Yamade^a ; Takayoshi Nakashima^a ; Kazuhiko Hayashi^a ; Ken-ichi Sato^a ; Jun-ichi Shimoyama^b ; Hitoshi Kitaguchi^c
• 关键词：Bi2223 tape ; DI-BSCCO ; uniformity
• 刊名：Physics Procedia
• 出版年：2012
• 期刊代码：P128_18753892
• 类别：ph
• 出版时间：2012
• 卷：27
• 期：Complete
• 页码：256-259
• 文件大小：522 K

摘要

Sumitomo Electric has been developing the silver-sheathed Bi2223 multi-filamentary wires since the discovery of Bi-based superconductors. DI-BSCCO is the superconducting wire with high and uniform critical current properties produced using the controlled-overpressure (CT-OP) sintering technique. The present commercial DI-BSCCO can provide the uniform high critical current, Ic, up to 180 A with length over 2000 m, and recently over 200 A with length over 1000 m were produced successfully, resulting from the improvement and control of the microstructure in Bi2223 multi-filaments. The short trial wires of several meters have exhibited the highest Ic over 240 A at 77 K in self-field (corresponding to 580 A per 1 cm-width). Besides, the optimization of carrier density after CT-OP have led to further enhancement of Ic, reached 250 A at 77 K in self-field. All the derivative products also have uniform critical current properties over entire length even after lamination with the reinforcing metals. The performances of DI-BSCCO can meet the growing needs for various applications of high temperature superconductor like high in-field applications, such as magnets and motors. The recent progress in transport properties of commercial DI-BSCCO and R&D short trial wires is shown.