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BSCCO 플라즈마 용사피막의 부분용융열처리 후 어닐링 시간에 따른 초전도 특성
박정식,이선홍,박경채,Park, Jeong-Sik,Lee, Seon-Hong,Park, Kyeung-Chae 한국재료학회 2014 한국재료학회지 Vol.24 No.2
$Bi_2Sr_2CaCu_2O_x$(Bi-2212) and $Bi_2Sr_2Ca_2Cu_3O_y$(Bi-2223) high-Tc superconductors(HTS) have been manufactured by plasma spraying, partial melt process(PMP) and annealing treatment(AT). A Bi-2212/2223 HTS coating layer was synthesized through the peritectic reaction between a 0212 oxide coating layer and 2001 oxide coating layer by the PMP-AT process. The 2212 HTS layer consists of whiskers grown in the diffusion direction. The Bi-2223 phase and secondary phase in the Bi-2212 layer were observed. The secondary phase was distributed uniformly over the whole layer. As annealing time goes on, the Bi-2212 phase decreases with mis-orientation and irregular shape, but the Bi-2223 phase increases because a new Bi-2223 phase is formed inside the pre-existing Bi-2212 crystals, and because of the nucleation of a Bi-2223 phase at the edge of Bi-2212 crystals by diffusion of Ca and Cu-O bilayers. In this study the spray coated layer showed superconducting transitions with an onset Tc of about both 115 K, and 50 K. There were two steps. Step 1 at 115 K is due to the diamagnetism of the Bi-2223 phase and step 2 at 50 K is due to the diamagnetism of the Bi-2212 phase.
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PMP에 따른 플라즈마 용사 Bi-2212/2223 초전도 피막 특성
조상흠 ( Sang Hum Cho ),이선홍 ( Seon Hong Lee ),박경채 ( Kyeong Chae Park ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 대한금속·재료학회지 Vol.44 No.7
Bi2Sr2CaCu2Ox(2212) and Bi2Sr2Ca2Cu2Oy(2223) high-Te superconductor (HTS) have been prepared by plasma spraying and PMP(Partial Melt Process). The 2212 HTS coating layer is synthesized through the peritectic reaction between Sr-Ca-Cu oxide coating layer and Bi-Cu oxide coating layer by partial melting process. The superconducting characteristics, it can be predicted from wetting secondary phase and mis-alignment of whisker, depends on the spray distance which was related to the spray particle melt. The 2212 HTS layer consists of the whisker grown in the diffusion direction. 2223 phase and secondary phase in 2212 layer were observed. The secondary phase is distributed uniformly over the whole surface which was caused to the mis-orientation of 2223. But it can be removed by oxygen pressure control. Spray coating layer shows superconducting with an onset Tr of about both 115 K and 77 K (Para-conductivity) in this study. There are two steps. step 1 at 115 K is due to the diamagnetism of the 2223 phase and step 2 at 78 K is due to the diamagnetism of the 2212 phase.
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