Studies on the Synthesis of High Purity and Fine Mullite Powder (I)

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J. Korean Ceram. Soc. > Volume 26(5); 1989 > Article

Journal of the Korean Ceramic Society 1989;26(5): 682.

고순도 초미립자 물라이트 분말 합성에 대한 연구 (I)

김경용, 김윤호, 김병호¹, 이동주²

한국과학기술연구원 정밀요업실
¹고려대학교 재료공학과
²쌍용중앙연구소

Studies on the Synthesis of High Purity and Fine Mullite Powder (I)

ABSTRACT

Fine mullite powder was prepared by colloidal sol-gel route. Boehmite as a starting material of Al2O3 and silica sol or fumed silica as a starting material of SiO2 were used. $alpha$-Al2O3, TiO2 and ZrO2 were used as seeding materials. The combination of boehmite and silica was found to be the stoichiometric mullite powder. Techniques for drying used were spray drying, freeze drying, reduced pressure evaporation and drying in a oven. The gelled powder was heated at 130$0^{circ}C$ for 100min and was attrition-milled for 1~3hrs. The mullite powder obtained was composed of submicrometer, uniform and spherical particles with a narrow size distribution. The mullite powder was characterized by BET, SEM, XRD and IR spectroscopy.