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Vol.28, No.2, 143 ~ 151, 1990
Title
Fabrication of the high Tc Thick Film of Y - Ba - Cu - O System by a Plasma Spraying Method
이헌Heon Lee, 주승기Seung Ki Joo
Abstract
YBa₂Cu₃O_7 thick films whose thickness varies from 150㎛ to 500㎛ were fabricated by a plasma spraying technique. It turned out that fresh films didn`t show the 123 superconducting phase by XRDP regardless of spraying conditions but annealed films showed high Tc under the particular spraying conditions. It was found that a particle size of the feeding powder and the annealing temperature after spraying play an important role on determining the superconductivity of the thick films. In this set of experiments, a particle size of over 100㎛ and the annealing temperature of 950℃ in O₂ ambient after the plasma spray turned out to be the best conditions to obtain a sharp Tc at around 85 K. Also it has been found that when H₂ gas instead of He was used as a secondary plasma gas superconduction phase formation was depressed and the reason has not been varified in this work.
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