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RISS 인기검색어
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- 저자 : 김양수(Y. S. Kim) (검색결과 46 건)
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Bi-Pb-Sr-Ca-Cu-O계 산화물 고온초전도체의 특성에 관한 연구
김양수,이민상,이민호,진영철 ( Y . S . Kim,M . S . Lee,M . S . Lee,Y . C . Jin ) 한국열처리공학회 1991 열처리공학회지 Vol.4 No.1
The formation of high T_c phase is very sluggish and c parameter of unit cell of high T_c phase is about 37Å. High T_c oxide superconductor with a T_c above 100K has been successfully prepared by solid state reaction method in BiSrCaCuO system by Pb adding. The microstructure related to the formation of the high T_c phase has been investigated. As compared with YBCO compound, the formation reaction of the high T_c requires long time heat treatment. It is due to the transformation from the low T_c phase to high T_c phase. The sintering just below the melting point of the calcined powder mixture is effective on the formation of the high T_c phase in Pb-added BiSrCaCuO system. The growth of the high T_c superconducting phase has a thin plate shape, which is characterized by the c parameter of 37Å. The formation of the high T_c phases is delayed by the excessive addition of Pb. The lattice parameter (c) of the unit cell (both the low and high T_c phases) is increased with increase of Pb.
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초전도 세라믹 Y-Ba-Cu-O계의 구조적 상전이와 분해거동에 관한 연구
이민호,이민상,김양수,진영철 ( M . H . Lee,M . S . Lee,Y . S . Kim,Y . C . Jin ) 한국열처리공학회 1991 열처리공학회지 Vol.4 No.3
In this study, the structural phase transition and decomposition of superconducting ceramic, Y-Ba-Cu-O system was studied. The results of the study are as follows. The high Tc superconductor Y₂Ba₂Cu₃O_(7-x) is made in solid state reaction of O₂atmosphere and the valve of X in Y₂Ba₂Cu₃O_(7-x) is 0.1∼0.2. The transition temperature of tetragonal-orthorhombic phase of Y₂Ba₂Cu₃O_(7-x) appear at 790℃-900℃. In the result of measuring the electrical resistance of sample annealed in O₂atmosphere, the electrical resistance show zero at 92K and the best superconductor, Y₂Ba₂Cu₃O_(7-x)(Y123) can be mabe.
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KSTAR 전류인입선 및 헬륨냉매 제어시스템 제작 및 설치
송낙형,우인식,이영주,곽상우,방은남,이근수,김정수,장용복,박현택,홍재식,박영민,김양수,최창호,Song, N.H.,Woo, I.S.,Lee, Y.J.,Kwag, S.W.,Bang, E.N.,Lee, K.S.,Kim, J.S.,Jang, Y.B.,Park, H.T.,Hong, J.S.,Park, Y.M.,Kim, Y.S.,Choi, C.H. 한국진공학회 2007 Applied Science and Convergence Technology Vol.16 No.5
KSTAR (Korea Superconducting Tokamak Advanced Research) current lead system (CLS) has a role to interconnect magnet power supply (MPS) in room temperature (300 K) and superconducting (SC) bus-line, electrically. For the first plasma experiments, it should be assembled 4 current leads (CL) on toroidal field (TF) current lead box (CLB) and 14 leads on poloidal field (PF) CLB. Two current leads, with the design currents 17.5 kA, and SC bus-lines are connected in parallel to supply 35 kA DC currents on TF magnet. Whereas, it could supply $20\;{\sim}\;26\;kA$ to each pairs of PF magnets during more than 350 s. At the cold terminals of the leads, there are joined SC bus-lines and it was constructed helium coolant control system, aside from main tokamak system, to protect heat flux through current leads and enhanced Joule heat due to supplied currents. Throughout the establishment processes, it was tested the high vacuum pumping, helium leak of the helium lines and hardwares mounted between the helium lines, flow controls for CL, and liquid nitrogen cool-down of possible parts (current leads, CL helium lines, and thermal shield helium lines for CLB), for the accomplishment of the required performances.
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