Mullitization of Kyanite-Al Mixture

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J. Korean Ceram. Soc. > Volume 23(2); 1986 > Article

Journal of the Korean Ceramic Society 1986;23(2): 7.

Kyanite-Al 혼합물의 Mullite화 반응

박정현, 배원태¹

연세대학교 요업공학과
¹경상대학교 재료공학과

Mullitization of Kyanite-Al Mixture

ABSTRACT

As the other silicate minerals such as kaolinite and pyrophyllite kyanite ($Al_2O_3$.$SiO_2$) is transformed to mullite and free silica or glassy phase at high temperature. Therefore $Al_2O_3$ is commonly added to kyanite in order to increase the mullite-yield. In case of $Al_2O_3$-addition mullite-yield depends on the reactivity of added $Al_2O_3$ with free silica which occurs from transformation of kyanite or exists as accessory minerals. It is well known that addition of activated $Al_2O_3$Al powder is added to kyanite to utilize the aluminothermal reac-tion of Al powder in reaction of mullite-formation.