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J. Korean Ceram. Soc. > Volume 27(6); 1990 > Article
Journal of the Korean Ceramic Society 1990;27(6): 808.
Al-Sec-Butoxide의 가수분해시에 있어서 $alpha$-$Al_2O_3$종의 동시첨가에 의한 열적 전이거동
김창은, 이해욱, 최진관, 김배연1
연세대학교 공과대학 요업공학과
1인천대학교 공과대학 재료공학과
The Thermal Behavior of Transformation by Simultaneous $alpha$-$Al_2O_3$ Seed Addition on the Al-Sec-Butoxide Hydrolysis
ABSTRACT
The thermal behavior of transformation and characteristics of seeded sample powders prepared by simultaneous $alpha$-Al2O3 seed addition with water on the Al-sec-butoxide hydrolysis were studied. $alpha$-Al2O3 seed particles are shown to act as nuclei for transformation of $theta$-to $alpha$-Al2O3 and to result in an increase in thetransformation kinetics and lowering of the transformation temperature by as much as 143$^{circ}C$. Simultaneous seed addition on the hydrolysis resulted in uniform dispersin and creation of nucleation site on seed surface and only 0.1wt% seeding lowered the transformation temperature by as much as 115$^{circ}C$. For 3wt% seed addition, $alpha$-Al2O3 single phase was obtained at 95$0^{circ}C$ for 100 minutes and the specific surface area of products were lowered to 11.9$m^2$/g as compared with that of $alpha$-Al2O3 powder prepared without seed at 115$0^{circ}C$ ; 15.1$m^2$/g due to depression of vermicular structure growth.
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