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Effect of pre-annealing conditions on critical current density of Bi-2223 tapes
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  • Effect of pre-annealing conditions on critical current density of Bi-2223 tapes
  • Effect of pre-annealing conditions on critical current density of Bi-2223 tapes
저자명
Ha. Dong-Woo,Yang. Joo-Saeng,Ha. Hong-Soo,Oh. Sang-Soo,Lee. Dong-Hoon,Hwang. Sun-Yuk,Park. Jung-Gyu,Kwon. Young-Kil
간행물명
한국초전도·저온공학회논문지
권/호정보
2003년|5권 1호|pp.31-34 (4 pages)
발행정보
한국초전도저온공학회
파일정보
정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

Bi-2223 superconducting wires with 55 filaments were fabricated by stacking, drawing process with different heat-treatment histories. Two kinds of powders were prepared. One was pre-annealed at 760-820 $^{circ}C$ and low oxygen partial pressure, and the other was only calcined state. Before rolling process, round wires were pre-annealed at 760 -820 $^{circ}C$ and in a low oxygen partial pressure. We confirmed that pre-annealing step was to transform Bi-2212 orthorhombic structure from Bi-2212 tetragonal structure and to reduce the formation of second phases at superconducting wire. However Bi-2223 phases were formed at higher pre-annealing temperature. Bi-2223 conductor was needed frequently annealing at low temperature because pre-annealing at precursor powder brought about decrease in workability. We could achieve highest Je of 6500 A/$ extrm{cm}^2$ at the tape using Bi-2212 orthorhombic phase by introduced slightly overheating at the 1st sintering process.