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논문 기본 정보

자료유형
학술저널
저자정보
김규태 (Neutron Science Division, Korea Atomic Energy Research Institute) 김찬중 (Neutron Science Division, Korea Atomic Energy Research Institute) 임준형 (School of Advanced Materials Science and Engineering, Sungkyunkwan University) 박의철 (School of Advanced Materials Science and Engineering, Sungkyunkwan University) 박진현 (School of Advanced Materials Science and Engineering, Sungkyunkwan University) 주진호 (School of Advanced Materials Science and Engineering, Sungkyunkwan University) 현옥배 (Power System Laboratory, Korea Electric Power Research Institute) 김혜림 (Power System Laboratory, Korea Electric Power Research Institute)
저널정보
한국초전도학회 Progress in superconductivity Progress in superconductivity 제9권 제2호
발행연도
2008.1
수록면
193 - 198 (6page)

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We fabricated BSCCO-2212(2212) bulk superconductors by using a casting process and evaluated the superconducting properties. The effects of annealing conditions on microstructure and critical properties were studied. It was found that the homogeneous and uniform microstructure improved the critical properties and the microstructures of ingot and annealed rods were different with the size of 2212 rod and tube. The critical current($I_c$) of rods increased with increasing annealing time, probably due to increased grain size of 2212. Annealing time of the highest $I_c$ for the smaller rod(diameter of 10 mm) was shorter(150 hr) than that of the larger rod(diameter of 16 mm, 400 hr). This size effect seems to be related to different grain sizes of the intermediate phases such as 2201 and secondary phases in the ingot. In addition, we fabricated 2212 tubes from the rod by removing the center region which contained inhomogeneous microstructures. The $I_c$ of 2212 tube with the outer diameter of 16 mm and the thickness of 2 mm was measured to 844 A, which corresponds to the critical current density of $1017\;A/cm^2$ at 77 K.

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