Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Effect of after annealing on critical current of Bi-2212 HTS round wires

후열처리 조건에 따른 Bi-2212 고온 초전도선의 임계전류 특성 변화

  • 하동우 (한국전기연구원 초전도재료연구그룹) ;
  • 김상철 (넥상스코리아 기술연구소) ;
  • 오재근 (한국전기연구원 초전도재료연구그룹) ;
  • 오상수 (한국전기연구원 초전도재료연구그룹) ;
  • 하홍수 (한국전기연구원 초전도재료연구그룹) ;
  • 송규정 (한국전기연구원 초전도재료연구그룹) ;
  • 고락길 (한국전기연구원 초전도재료연구그룹) ;
  • 김호섭 (한국전기연구원 초전도재료연구그룹) ;
  • 김태형 (한국전기연구원 초전도재료연구그룹)
  • Published : 2006.06.22
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Abstract

The important merit of Bi-2212/Ag wire is to apply cable as round wire state. Bi-2212 high Tc superconducting wires were fabricated in order to apply Rutherford cable near the future. Various Ag ratio from 0.22 to 0.42 of Ag tubes for PID (powder-In-Tube) process were used to investigate the workability and to prevent breakage of filaments during drawing. In order to find proper heat treatment condition, we investigated micro-structure of Bi-2212/Ag wires by using differential thermal analysis, XRD and SEM. The effect of atmosphere on the peritectic decomposition temperature of precursor was investigated. The shape of grain was observed by SEM to investigate Bi-2212 phase formation in filaments. The higher of Ag ratio of mono filament had the higher critical current density, Jc. The wire with 0.42 of Ag ratio showed 7,886 A/cm2 of Jc at 77K.

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