Zirconia Coating of SiC Whiskers Using the Aqueous Solutions of Zr(SO4)2

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J. Korean Ceram. Soc. > Volume 33(12); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(12): 1380.

$Zr(SO_4)_2$ 수용액을 이용한 SiC 휘스커의 지르코니아 코팅

김덕준, 김환

서울대학교 공과대학 무기재료공학과

Zirconia Coating of SiC Whiskers Using the Aqueous Solutions of Zr(SO4)2

ABSTRACT

The effects of urea addition and reaction conditions were examined in the prepareation of zirconia coated SiC whiskers through surface precipitation taking place during high-temperature aging of Zr(SO4)2 solutions containing the whiskers. More dense zirconia-hydrate was precipitated on the surfaces of the whiskers in the presence of urea. The ratio of the concentration of Zr(SO4)2 to the amount of added whiskers was the most important factor to confine the precipitation of zirconia-hydrate only at the surfaces of the whiskers The from of the coating layers was unchanged after heat-treatment leading to the dehydration and crystallization of the layers.

Key words: Zirconia coating, Silicon carbide whisker, Zirconium sulfate, Surface precipitation