カテゴリ: 論文誌(論文単位)グループ名: 【B】電力・エネルギー部門発行日: 2020/03/01タイトル(英語): Buffer-assisted Top-seeded Infiltration and Growth for Fabricating Dense, Single-grain (RE)-Ba-Cu-O Bulk Superconductors著者名: Devendra Namburi (Department of Engineering, University of Cambridge), Yunhua Shi (Department of Engineering, University of Cambridge), Mark Ainslie (Department of Engineering, University of Cambridge), Anthony Dennis (Department of Engineering, Universit著者名(英語): Devendra Namburi (Department of Engineering, University of Cambridge), Yunhua Shi (Department of Engineering, University of Cambridge), Mark Ainslie (Department of Engineering, University of Cambridge), Anthony Dennis (Department of Engineering, University of Cambridge), John Durrell (Department of Engineering, University of Cambridge), David Cardwell (Department of Engineering, University of Cambridge)キーワード: superconductivity，(RE)BCO bulk superconductors，melt growth，infiltration growth，dense microstructure，buffer technique要約(英語): (RE)BCO, rare-earth based high temperature superconductors fabricated in the form of large, single grain bulk samples can trap comparatively large magnetic fields in relatively small sample volumes, unlike conventional permanent magnetic materials. Fabrication of (RE)BCO single grains has been achieved largely following the development of processing techniques based on melt growth (MG). In the present study, the recently developed alternative fabrication technique of infiltration and growth (IG) is discussed and its significance highlighted in the context of obtaining (RE)BCO bulk superconductors with dense microstructures. The necessity of employing a buffer layer in the IG methodology is elucidated. The path followed in solving the complex problem of controlling the amount of RE2BaCuO5 (RE-211) present in the microstructure of the end product to achieve enhanced and optimized flux pinning is described. A brief overview of the recently developed 2-step, buffer-assisted top-seeded infiltration and growth (BA-TSIG) fabrication technique, which enables successful fabrication of (RE)BCO bulks, is presented. Finally, two novel experiments based on the TSIG technique―fabrication of a bar-shaped YBCO sample (with size: 72mm × 24mm × 15mm) and multi-seeding of YBCO (with two NdBCO seeds in 0°-0° configuration, with aligned a-b planes)―are described and further potential options for the fabrication of complex-shaped (RE)BCO bulk components for specific practical applications are outlined.本誌: 電気学会論文誌B（電力・エネルギー部門誌） Vol.140 No.3 （2020） 特集：未来社会創造に向けた超電導バルク材の挑戦本誌掲載ページ: 148-153 p原稿種別: 論文／英語電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejpes/140/3/140_148/_article/-char/ja/
