발간논문

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Vol.28, No.3, 210 ~ 217, 1990
Title
Preparation of High Purity - Ultra Fine Al2O3 by Sol - Gel Method
조창국Chang Kuk Jo, 원창환Chang Whan Won, 허병선Byung Sun Chun
Abstract
Characteristics of ultra fine Al₂O₃ powders prepared by Sol-Gel process was investigated with hydrolysis condition and calcination temperature. 1) The transition process of Al₂O₃ took place through the series, Boemite Gel(AlooH)-δ-Alumina-θ-Alumina-α-Alumina. 2) The grain size of the calcined products was increased and the surface area was decreased linearly with increasing calcination temperature. 3) The size of first forming product and the agglomerated was less than 10 ㎚ and about 0.1-0.3 ㎛, respectively. 4) The recovery of Al₂O₃ was increased with decreasing PH of solution and increasing both the ratio of Alkoxide : H₂O and agitation temperature.
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