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J. Korean Ceram. Soc. > Volume 28(9); 1991 > Article
Journal of the Korean Ceramic Society 1991;28(9): 705.
졸겔법에 의한 알루미나의 제조(II) : 중합졸로부터 제조한 분말의 특성
이해욱, 김창은, 김구대1, 정형진1
연세대학교 요업공학과
1한국과학기술연구원 세라믹스부
Preparation of Alumina by the Sol-Gel Process (II) Characteristics of Powders Obtained by Polymeric Alumina Sol
Alumina precursor sol was obtained by the reaction of Al(OC4H9)3 and acetylacetone in the solvent followed by the partial hydrolysis. This sol was measured by viscosity and the effect of pH. The powders obtained from this sol were calcined at the various temperatures. The transition of crystals and crystal state were investigated at the various temperatures. The powders dried at 90$^{circ}C$ showed amorphous and ${gamma}$-Al2O3 at 900$^{circ}C$, ${alpha}$-Al2O3 mono-phase at 1050$^{circ}C$ respectively. As a result of Al27-MASNMR analysis, amorphous and ${alpha}$-Al2O3 powders showed 6-coordinated Al, ${gamma}$-Al2O3 4-coordinated Al respectively.
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