| 용융주조법으로 제조한 BSCCO-2212 초전도체의 공정변수 연구 |
| 김규태, 장석헌, 임준형, 주진호, 김찬중1, 홍계원2, 김혜림3, 현옥배3 |
성균관대학교 신소재공학부
1한국원자력 연구소 원자력재료 기술개발팀
2한국산업기술대학교 전기공학과
3한국전력공사 전력 연구원 |
| Study on the Processing Variables of BSCCO-2212 Superconductor made by Melt Casting Process |
| Kyu-Tne Kim, Seok-Hern Jang, Jun-Hyung Lim, Jinho Joo, Chan-Joong Kim1, Gye-Won Bong2, Rye-Lim Kim3, Ok-Bae Hyun3 |
School of Advanced Materials Science and Engineering, Sungkyunkwan University
1Nuclear Material Development Team, Korea Atomic Energy Research Institute
2The Department of Electronic Engineering, Korea Polytechnic University
3Power System Laboratory, Korea Electric Power Research Institute |
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| ABSTRACT |
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We fabricated BSCCO-2212 (2212) bulk superconductor by melt casting process, and evaluated the dependence of the critical properties on the temperature and cooling .ate of mold and the pouring methods of melt. It was observed that the critical current (Ic) of 2212 was significantly dependent on the pre-heating temperature of the mold. At the pre-heating temperature of $500^{circ}C$ followed by air cooling condition, Ic of 48 A at 77 K was obtained which was higher than others processed at different temperatures. In addition, the Ic improved to 132 A when tilt casting method was applied. The improved Ic is probably due to the fact that the tilt casting reduced a turbulent flow of the melt during casting causing less porosity and more homogeneous microsructure. Critical temperature was measured to be 87-89 K after the first heat treatment and it improved to 90-91 K when subsequently heat treated at $650^{circ}C$ in a nitrogen atmosphere. This improvement was considered to be due to an optimization of the oxygen content in the range of 8.16-8.2. |
| Key words:
BSCCO-2215, Critical current, Melt easting process, Texture, Tilt casting |
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