Transactions on Electrical and Electronic Materials

  • 제5권2호
  • /
  • Pages.55-60
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  • 2004
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  • 1229-7607(pISSN)
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  • 2092-7592(eISSN)
한국전기전자재료학회 (The Korean Institute of Electrical and Electronic Material Engineers)
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The Effect of Processing Parameters on HTS Tube Characteristics

  • Jung, Sengho (Department of Materials Engineering, Chungbuk National University) ;
  • Jang, Guneik (Department of Materials Engineering, Chungbuk National University) ;
  • Ha, Dongwoo (Korea Electrotechnology Research Institute) ;
  • Sung, Taehyun (Korea Electric Power Research Institute)
  • 발행 : 2004.04.01
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초록

High-temperature Superconductor(HTS) tubes were fabricated in terms of different chemical compositions and various SrSO$_4$additions by centrifugal forming method. For powder melting by induction the optimum range of melting temperatures and preheating temperature were 1050$^{\circ}C$, 1100$^{\circ}C$ and 550$^{\circ}C$ for 30 min, respectively. The mould rotating speed was 1000 rpm. A tube was annealed at 840$^{\circ}C$ for 72 hours in oxygen atmosphere. The plates like grains more than 20 $\mu\textrm{m}$ were well developed along the rotating direction of mould regardless of initial chemical compositions and the amounts of SrSO$_4$in Bi2212. The specimen with Bi2212 composition exhibited T$\_$c/ of 83 K, while the specimens fabricated with other compositions are lower than 60 K. The measured I$\_$c/ and J$\_$c/ at 77 K(B = 0 T) in Bi2212 with 7 % SrSO$_4$ composition were about 680 A and 380 A/$\textrm{cm}^2$.

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