Preparation of High Purity Alumina by Alkoxide Process

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J. Korean Ceram. Soc. > Volume 26(3); 1989 > Article

Journal of the Korean Ceramic Society 1989;26(3): 445.

Aluminum Isopropoxide의 가수분해법에 의한 고순도 $alpha$-Al2O3의 제조

백행남, 이명기, 곽중협, 서태수

한국화학연구소 무기화학부

Preparation of High Purity Alumina by Alkoxide Process

ABSTRACT

Hydrolysis of aluminum isopropoxide with excess water in the presence of excess isopropyl alcohol resulted in the formation of boehmite in independence of temperature of hydrolysis and aging. Stoichiometric and substoichiometric amount of water hydrolyzed aluminum isopropoxide to pseudo-boehmite and amorphous one, respectively. $alpha$-Al2O3 with 0.3${mu}{textrm}{m}$ in median size was produced by calcination of boehmite, bseudo-boehmite and amorphous boehmite at 125$0^{circ}C$, 120$0^{circ}C$, and 115$0^{circ}C$ for one hour, respectively. Singnificant reduction in particle size was found during transition from $theta$-Al2O3 to $alpha$-Al2O3. $alpha$-Al2O3 produced in this study was relatively uniform spherical and its purity was found to be over 99.9%.