Isothermal Phase Transformation Beahviors in <TEX>$Al_2O_3$</TEX> Coated Y-TZP Powders

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J. Korean Ceram. Soc. > Volume 30(8); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(8): 651.

$Al_2O_3$로 코팅된 Y-TZP 분말의 등온 상전이 거동

이종국, 양권승

조선대학교 재료공학과

Isothermal Phase Transformation Beahviors in $Al_2O_3$ Coated Y-TZP Powders

ABSTRACT

Granulated Y-TZP powders were coated by using Sol-Gel method and the coating effect of Al2O3 on the isothermal phase transformation in Al2O3 coated Y-TZP powders was investigated. During aging, tetragonal phase in Y-TZP powder were isothermally transformed to monoclinic, but the tetragonal phase in Al2O3 coated Y-TZP powders was continuously retained in spite of long aging. It can be considered that the improvement of thermal stability of tetragonal phase in Al2O3 coated Y-TZP powders may be due to the increase of constraint effect near tetragonal phase, and the suppression of surface transformation by obstructing the reaction between the surface of Y-TZP and H2O.