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

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

  • 한명섭 (충남대학교 공과대학 재료공학과) ;
  • 서동수 (충남대학교 공과대학 재료공학과)
  • Published : 1992.02.01

Abstract

High-Tc superconductor thick films of YBa2Cu$\chi$O7-y (X=3, 3.5, 4) of which thickness varies from 100 $\mu\textrm{m}$ to 200 $\mu\textrm{m}$ 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.

Keywords

References

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