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플라즈마 용사에 의한 BSCCO 초전도체 형성을 위한 용사 분말의 제조에 관한 연구
박정식,조창은,박경채,Park, Jeong-Sik,Cho, Chang-Eun,Park, Kyung-Chae 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.6
Formation and characteristics of spraying powder for BSCCO High-Tc superconductor prepared by plasma spray coating were investigated. The addition of 3% of binder gives the best flowability of the powder. Ball milling for 30h and 35h gives the best flowability of powder in the case of 2001 and 0212, respectively. The withdraw ratio increases upon binder addition from 12 to 27% in the case of 2001 and from 18 to 31% in the case of 0212 for sieving powder of $30-90{\mu}m$ in size. The built-up efficiency for $100{\mu}m$ thickness of spray coating is increased more than 30% by binder addition. The microstructure of the spray coated layers was investigated by XRD and EDS analysis.
플라즈마 용사 BSCCO(Bismuth Strontium Calcium Copper Oxide) 초전도 피막의 접합 특성
박정식(Jung-Sik Park),조창은(Chang-Eun Cho),고영봉(Young-Bong Ko),박광순(Kwang-Soon Park),박경채(Kyeung-Chae Park) 한국표면공학회 2013 한국표면공학회지 Vol.46 No.5
We performed plasma spraying for 2001 (Bi:Cu = 2:1), 0212 (Sr:Ca:Cu = 2:1:2) oxide powders. Bi₂Sr₂CaCu₂Ox (2212) superconductor has been prepared by PMP-AT (partial melting process-annealing treatment). The 2212 phase is synthesized between Sr-Ca-Cu oxide coating layer (0212) and Bi-Cu oxide coating layer (2001) by movement of partial melted Bi on 2001 layer and the diffusion reaction (Cu, Sr, Ca) after PMP-AT. There are two different coating layers on joining process. The one is ABAB coating layers and the other is BAAB coating layers by arrangement of 2001 (A), 0212 (B) layers. We performed heat treatment these two different coating layers processes under same PMP-AT conditions. We obtained Bi-2212 superconducting layers at each experimental condition, and the result of MPMS, the critical temperature was showed about 78 K. But the microstructure images and result of EDS as each experimental variable were showed about the qualitatively different Bi-2212 superconducting phases. We also deduced the generation mechanism of Bi-2212 superconducting layer as a result of these experimental data, microstruc ture images, EDS data and phase diagram.