Preparation of Alumina by the Sol-Gel Process (II) Characteristics of Powders Obtained by Polymeric Alumina Sol

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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

ABSTRACT

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.