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논문 기본 정보

자료유형
학술저널
저자정보
Ha, Dong-Woo (Applied Superconductivity Group, Korea Electrotechnology Research Institute) Yang, Joo-Saeng (Applied Superconductivity Group, Korea Electrotechnology Research Institute) Ha, Hong-Soo (Applied Superconductivity Group, Korea Electrotechnology Research Institute) Oh, Sang-Soo (Applied Superconductivity Group, Korea Electrotechnology Research Institute) Lee, Dong-Hoon (Applied Superconductivity Group, Korea Electrotechnology Research Institute) Hwang, Sun-Yuk (Applied Superconductivity Group, Korea Electrotechnology Research Institute) Park, Jung-Gyu (Applied Superconductivity Group, Korea Electrotechnology Research Institute) Kwon, Young-Kil (Applied Superconductivity Group, Korea Electrotechnology Research Institute)
저널정보
한국초전도저온학회 한국초전도·저온공학회논문지 한국초전도·저온공학회논문지 제5권 제1호
발행연도
2003.1
수록면
31 - 34 (4page)

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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/$\textrm{cm}^2$ at the tape using Bi-2212 orthorhombic phase by introduced slightly overheating at the 1st sintering process.

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