Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
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The Effect of Different Heat Treatment Processes on Critical Properties of Bi2212/Ag ROSAT Wire

열처리 공정 변화에 따른 Bi2212/Ag ROSAT 선재의 임계 특성

  • Oh, W.S. (Department of Advanced Materials Engineering, Chungbuk national university) ;
  • Jang, G.E. (Department of Advanced Materials Engineering, Chungbuk national university) ;
  • Kim, S.C. (Nexans Korea RND Center) ;
  • Ha, D.W. (Korea Electrotechnology Research Institute) ;
  • Oh, S.S. (Korea Electrotechnology Research Institute)
  • Published : 2007.10.31
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Abstract

We have investigated the effect of different heat treatment processes on electrical and magnetic properties of Bi2212/Ag ROSAT wire. The ROSAT wire was fabricated by stacking and arranging 12 filaments Bi2212/Ag tapes in triple rotation symmetry in a Ag tube. ROSAT wires have been prepared using a partial melting method with changing $T_{max}$ and $T_a$ in oxygen atmosphere. The highest critical current density($J_c$) at 65 K under 0 T was $21,158\;A/cm^2$ for wire prepared $890\;^{\circ}C(T_{max})$ and $840\;^{\circ}C(T_a)$, respectively. SEM results indicated that the wire prepared at $890\;^{\circ}C(T_{max})$ and $840\;^{\circ}C(T_a)$ showed better directional phases than the other samples. However the result of magnetic susceptibility measurement indicates that the wire prepared $890\;^{\circ}C(T_{max})$ and $835\;^{\circ}C(T_a)$ had better superconducting phases than the other samples. It was revealed that heat treatment temperature was important factor for superconducting properties of the ROSAT wire.

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