The Influence of Drawing Parameters on Sausaging and Critical Current of Bi-2223/Ag HTS Wires.

Bi-2223/Ag 고온 초전도 선재의 임계전류 및 소세징에 미치는 인발 조건의 영향

  • 하홍수 (한국전기연구소 전략기술단 초전도 응용연구그룹) ;
  • 오상수 (한국전기연구소 전략기술단 초전도 응용연구그룹) ;
  • 하동우 (한국전기연구소 전략기술단 초전도 응용연구그룹) ;
  • 김상철 (한국전기연구소 전략기술단 초전도 응용연구그룹) ;
  • 권영길 (한국전기연구소 전략기술단 초전도 응용연구그룹) ;
  • 류강식 (한국전기연구소 전략기술단 초전도 응용연구그룹)
  • Published : 2000.11.01

Abstract

Bi-2223/Ag superconducting wires have been mainly prepared by a powder-in-tube method. The drawing and the rolling are main processes to increase the core density and wire length. In the fabrication of long wire, especially, the drawing should be precisely controlled to assure the filament homogeneity. In this paper, the influences of drawing die angle, bearing length and reduction ratio on the sausaging and the critical current density of the wire are investigated. Single cored and multi-filamentary wires are fabricated by PIT method with different conditions. The core densities and sausaging in the wires are investigated and are discussed regarding their relationship to the I$_{c}$. It was made clear that the geometry of drawing die is sensitively dependent on the sausaging. The improvement of I$_{c}$ was achieved by reducing the die angle and high core density.ity.

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