Fabrication of Superconducting Joints between 61 Filaments of BSCCO 2223 Tapes

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J. Korean Ceram. Soc. > Volume 35(2); 1998 > Article

Journal of the Korean Ceramic Society 1998;35(2): 137.

61심 BSCCO 2223 고온초전도 선재의 접합부 제조

김철진, 박성창, 유재무¹

경상대학교 첨단소재연구소
¹한국기계연구원

Fabrication of Superconducting Joints between 61 Filaments of BSCCO 2223 Tapes

ABSTRACT

High-temperature superconducting joints between 61 filaments of Bi-2223 tapes were fabricated by chem-ical corrosion and repeated thermomechanical process. The silver sheath of the superconducting tape was chemically removed using chemical etchant(NH4OH:H2O2=1:1) from one side of each tape without altering the form of lap joint. The joined region was formed by uniaxial pressing and a series of thermomechanical process and then subjected to properties measurement and microstructural analysis. The critical current(Ic) variation and I-V characteristics along the joint were mesured with several configuration of proble points. Ic value of the transition region of the joint inthe multifilament tape which limit the total current carring capacity of the superconducting tape was higher than that of monofilament tape. But the transition ex-ponent n-value of the multi-filament tape was lower than that of monofilament wire due to the interaction of the individual superconducting core of the multi-filament. The critical current through the joint area was improved by respeated press and reaction annealing treatment,

Key words: Superconductor, BSCCO, 2223, Joint, Critical Current