Superconducting joint interface for multi-filamentary Bi2223 tapes fabricated by JIM method

JOURNAL OF ALLOYS AND COMPOUNDS

卷:806

Article

Kanazawa, Shintetsu¹  Yanagisawa, Yoshinori² 

[1] Muroran Inst Technol, Muroran, Hokkaido 0508585, Japan

[2] RIKEN SPring 8 Ctr, Yokohama, Kanagawa 2300045, Japan

关键词: Superconducting joint;    Joint interface;    Bi2223;    Bi2212;   

DOI  :  10.1016/j.jallcom.2019.07.331

来源: Elsevier

【 摘 要 】

Recently, we proposed a method of joint by incongruent melting (JIM) for making a superconducting connection between two multi-filamentary Bi2223 tapes. At high temperatures, the Bi2223 phase separates into solid Bi2212 and a liquid phase by incongruent melting. In the JIM method, the Bi2223 filaments in a tape are first melted to Bi2212 and liquid. Then, Bi2212 is connected by the liquid to form a superconducting current pathway. In the present experiment, a joint between multi-filamentary Bi2223 tapes was prepared, resulting in a superconducting joint with a critical current of 8 A at 77 K. We then investigated the microstructure of the superconducting joint interface using X-ray diffraction and SEM/ EDS, to clarify the superconducting joint formation. In examining samples prepared using the JIM method, Bi2212 and Sr-Ca-Cu-O system compounds were found at the joint interface, which had a high crystalline orientation. (C) 2019 Elsevier B.V. All rights reserved.

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