Synthesis of Pure Fine Mullite Powders by Sol-Gel Process

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J. Korean Ceram. Soc. > Volume 28(7); 1991 > Article

Journal of the Korean Ceramic Society 1991;28(7): 503.

졸겔법을 이용한 고순도 Mullite 분말의 합성

이경희, 이병하, 김영호, 오권오, 백용혁¹

명지대학교 무기재료공학과
¹전남대학교 무기재료공학과

Synthesis of Pure Fine Mullite Powders by Sol-Gel Process

ABSTRACT

High pure and fine mullite powders were synthesized from Al-secbutoxide[Al(OC4H9)3] and TEOS[Si(OC2H5)4] (SiO2/Al2O3=2/3 mole). Sol-Gel process by partial hydrolysis technique, as it were, first, TEOS was partially hydrolysized and then mixed with Al-secbutoxide for complete hydrolysis was used. The mullite precursor was synthesized within 30 hrs, which was reduced about a half of synthetic time in comparison with the other's study. Al-Si spinel was formed at 980℃ and mullite crystal was formed at 1200℃. Mullite powders synthesized in this study was spherical type like those of the other studies and particle sizes were very fine. Also mullite powders calcined at 1,600℃ had a stoichiometric composition (3Al2O3·2SiO2) and lattice constants were coincided with known theoretical values.