Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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The Effects of Alloying-Element Additions to Ag Sheath on Thermal Conductivity and Properties of Bi-2223 Superconductor Tapes

합금원소 첨가에 따른 Ag 피복 Bi-2223 초전도 선재의 열전도도 측정 및 특성평가

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  • John Slavko Volf (Institute for Superconducting and Electronic Materials, University of Wollongong, Australia) ;
  • Hua Kun Liu (Institute for Superconducting and Electronic Materials, University of Wollongong, Australia) ;
  • Miles Apperley (Australian Superconductors, Engineering & Innovation Education Centre, Australia)
  • 주진호 (성균관대학교 금속재료공학부) ;
  • 장석헌 (성균관대학교 금속재료공학부) ;
  • 김정호 (성균관대학교 금속재료공학부) ;
  • 임준형 (성균관대학교 금속재료공학부) ;
  • 김규태 (성균관대학교 금속재료공학부) ;
  • 지봉기 (한국원자력연구소 원자력재료기술 개발부) ;
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  • Published : 2003.07.01
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Abstract

The effects of alloying-element additions to Ag sheath on thermal conductivity and mechanical properties of Bi-2223 superconductor tapes have been evaluated. In order to evaluate the effects of sheath alloys and their configuration on the properties of tape, various combinations of Ag and Ag alloys were selected as the inner and outer sheath. Thermal conductivity of the tapes was evaluated by using thermal integral method at 10 ∼120 K. It was observed that the addition of Mg, Sb, and Au to Ag sheath significantly decreased the thermal conductivity at low temperature probably due to the alloying effect. Specifically, the thermal conductivity of AgMg, AgSb, and AgAu at 40 K were 411.4, 142.3, and 109.7 W/(m·K), respectly, which is about 2∼9 times lower than that of Ag (1004.6 W/(m·K)). In addition, the thermal conductivity of alloy-sheathed tape was significantly dependent on their thermal conductivities of constituent sheath materials. The mechanical properties of alloy-sheathed tapes were also evaluated. Yield strength and tensile strength were improved but workability decreased for alloy-sheathed tapes.

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References

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