Microstructure and Prooperties of Y-Ba-Cu-O Superconductor Fabricated by Hot Isostatic Pressing

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J. Korean Ceram. Soc. > Volume 26(2); 1989 > Article

Journal of the Korean Ceramic Society 1989;26(2): 267.

열간정수압소결(HIP)시킨 Y-Ba-Cu-O 초전도체의 조직과 특성

신미남, 백수현, 송진태

한양대학교 재료공학과

Microstructure and Prooperties of Y-Ba-Cu-O Superconductor Fabricated by Hot Isostatic Pressing

ABSTRACT

YBa2Cu3O7-x oxide superconductors were fabricated by sintering and hotisostatic pressing (HIP), and their microstructures and properties were compared with each other. Thougha part of the second phase was observed along grain boundaries, their structures were consisted of single (123) phase and they had many porosities. But, porosities were remakably reduced by Hiping and the densification was brought about. The structure of (123) compound also showed a number of twins, which are typical of high Tc superconductors. The on-set temperature of YBa2Cu3O7-x compound sintered at 96$0^{circ}C$ in oxygen and hipped at 88$0^{circ}C$ was highest, but that shwoed 0 resistance at 87$^{circ}$K, which is a little lower than the compound sintered at 96$0^{circ}C$. HIP treatment also increased the critical current density of as-sintered compound. However, its value was low, which may be ascribed to the many pores of starting-sintered compact and partially to the second phase along grain boundaries.