Crystalline Phases and Superconductor Characteristics of the Plasma Sprayed YBa2Cu<TEX>$chi$</TEX>O7-y High Tc Superconductor Thick Film

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J. Korean Ceram. Soc. > Volume 29(2); 1992 > Article

Journal of the Korean Ceramic Society 1992;29(2): 152.

플라즈마 용사법에 의해 제조된 YBa2Cu$chi$O7-y(X=3, 3.5, 4) 고온초전도체 후막층의 결정상 및 초전도 특성

한명섭, 서동수

충남대학교 공과대학 재료공학과

Crystalline Phases and Superconductor Characteristics of the Plasma Sprayed YBa2Cu$chi$O7-y High Tc Superconductor Thick Film

ABSTRACT

High-Tc superconductor thick films of YBa2Cu$chi$O7-y (X=3, 3.5, 4) of which thickness varies from 100 $mutextrm{m}$ to 200 $mutextrm{m}$ were successfully prepared by plasma spraying method, and the characteristics of thick film depending on copper content and heat treatment conditions were investigated. Regardless of heat-treated temperature, the specimens with X=3 were composed of YBa2Cu$chi$O7-y, Y2BaCuO5 and BaCuO3 phases. The specimens with X=4, however, were composed of YBa2Cu$chi$O7-y phase at all heat treatment conditions. The specimens with X=4 composition showed the best superconducting characteristics after heat treatment at 925$^{circ}C$, and the superconducting transition temperature with zero resistivity (Tc,zero) was 87K. The thick film lost superconductivity when the specimens were heat-treated at 950$^{circ}C$ because of interdiffusion between superconductor elements and bond coating elements and Y2BaCuO5 phase was found was found to be main phase at the interface.