플라즈마 용사 BSCCO(Bismuth Strontium Calcium Copper Oxide)초전도 피막의 접합 특성
Joining Characteristics of Plasma Sprayed BSCCO Superconducting Coatings
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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 2212phase 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. Thereare two different coating layers on joining process. The one is ABAB coating layers and the other is BAABcoating layers by arrangement of 2001 (A), 0212 (B) layers. We performed heat treatment these two differentcoating layers processes under same PMP-AT conditions. We obtained Bi-2212 superconducting layers ateach experimental condition, and the result of MPMS, the critical temperature was showed about 78 K. Butthe microstructure images and result of EDS as each experimental variable were showed about the qualitativelydifferent Bi-2212 superconducting phases. We also deduced the generation mechanism of Bi-2212 superconductinglayer as a result of these experimental data, microstruc ture images, EDS data and phase diagram.
Abstract
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 2212phase 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.
참고문헌 (9)
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