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Superconducting Joint of Multi-filament BSCCO(2223) Tapes by using Single-filament Tape

BSCCO(2223) 단심 초전도 선재를 이용한 다심 초전도 선재의 접합공정 연구

  • 김규태 (성균관대학교 신소재공학과) ;
  • 김정호 (성균관대학교 신소재공학과) ;
  • 장석헌 (성균관대학교 신소재공학과) ;
  • 주진호 (성균관대학교 신소재공학과) ;
  • 강형구 (연세대학교 전기전자공학과) ;
  • 고태국 (연세대학교 전기전자공학과) ;
  • 하홍수 (한국전기연구원 초전도응용연구사업팀) ;
  • 오상수 (한국전기연구원 초전도응용연구사업팀)
  • Published : 2003.10.01

Abstract

We jointed Bi(Pb)-Sr-Ca-Cu-O multifilament tapes and evaluated their electrical and mechanical properties. In order to improve connectivity of multifilaments, one or two single-filament tape was inserted between two multifilament tapes. The critical current ratio(CCR) and n-value of the jointed tapes were evaluated as a function of uniaxial pressure. It was observed that critical current ratio and n-value were 24.8-29.0% and 2.5-2.8 for MM lap-jointed tape. On the other hand, the corresponding values were improved to 24.7-53.9% and 3.1-4.2 for MSM jointed tape, and 63.4-76.0% and 3.4-5.1 for double MS:vr lap-jointed tape, respectively. The highest electrical properties of double MSM lap-jointed tape are considered to be owing to the presence of single core, causing better interconnections of multifilaments between the two tapes. The mechanical property of jointed tape was evaluated and correlated to the microstructural evolution. The strength of jointed tapes was 44-64% less than that of the unjoined tape. The strain tolerance of jointed tape was also reduced compared to that of the unjoined tape. These lower mechanical properties of jointed tape are probably due to the induced nonuniform microstructure such as the existence of cracks and Ag-intrusion in the joined region.

Keywords

Critical current ratio(CCR);N-value;Superconducting join

References

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