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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A Study on the Casting Process Variables and Optimum SrSO4 Content of the BSCCO(2212) Bulk Superconductor

BSCCO(2212) 벌크 초전도체의 주조조건 및 SrSO4 최적함량에 대한 연구

  • 김규태 (성균관대학교 신소재공학부) ;
  • 박의철 (성균관대학교 신소재공학부) ;
  • 장석헌 (성균관대학교 신소재공학부) ;
  • 임준형 (성균관대학교 신소재공학부) ;
  • 주진호 (성균관대학교 신소재공학부) ;
  • 김찬중 (한국원자력연구소 초전도재료연구팀) ;
  • 김혜림 (한전전력연구원 전력시스템연구소) ;
  • 현옥배 (한전전력연구원 전력시스템연구소)
  • Published : 2006.06.01
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Abstract

We fabricated BSCCO-2212 (2212) rod by the melt casting process (MCP) and evaluated the effect of the melt flowing on the critical current ($I_c$) by using vertical and tilt casting. It was observed that the $2212-SrSO_4$ rod processed by the tilt casting method with homogeneous pre-heating temperature of the mold had a higher $I_c$ than that processed by the vertical casting method. We also evaluated the influence of the strontium sulfates ($SrSO_4$) addition on the texture, microstructure, critical current and temperature, and mechanical hardness of the $2212-SrSO_4$ rods. It was observed that the addition of $SrSO_4$ improved the critical current ($I_c$) and mechanical hardness of the 2212. The $I_c$ of the 2212 increased as the $SrSO_4$ content increased and reached a peak value (260 A at 77 K) at an $SrSO_4$ content of 6 wt.%. In addition, the addition of $SrSO_4$ had a beneficial effect on the mechanical hardness of the 2212. We studied the possible cause of the variation in the $I_c$ with the melt flowing and the $SrSO_4$ content based on the XRD, EPMA analysis and the microstructural observation.

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References

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