Effect of pore characteristics of AlO(OH) nano gel on crystal growth of α-Al2O3 platelets by molten salt precipitation
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To precipitate the complex gel of a flux and an aluminum hydroxides gel, an aqueous solution of a mixture of Na2CO3 and Na2PO4·12H2O was added with stirring into an aqueous solution of a mixture of Al2(SO4)3·18H2O, Na2SO4 and K2SO4, and then the complex gel was aged in 0~30 h at 90oC. As aging time passed, the aluminum hydroxides contained in the complex gel were grown to a acicular AlO(OH) nano gel. Also, aging time had an effect on the physical properties of the AlO(OH) nano gel and on the crystal growth of the α-Al2O3 platelets prepared by molten-salt precipitation. In this study, the complex gel was crystallized in the temperature range of 400~1,200oC and after drying at 110oC, the effect of aging time on precipitation temperature, the size, thickness, morphology and particle size distribution of the α-Al2O3 platelets were investigated. As aging time passed, the α-Al2O3 platelets showed a tendency toward an increase in size and thickness as a result of an increase in BET surface area and pore volume of the AlO(OH) nano gel.
Abstract
To precipitate the complex gel of a flux and an aluminum hydroxides gel, an aqueous solution of a mixture of Na2CO3 and Na2PO4·12H2O was added with stirring into an aqueous solution of a mixture of Al2(SO4)3·18H2O, Na2SO4 and K2SO4, and then the complex gel was aged in 0~30 h at 90oC. As aging time passed, the aluminum hydroxides contained in the complex gel were grown to a acicular AlO(OH) nano gel. Also, aging time had an effect on the physical properties of the AlO(OH) nano gel and on the crystal growth of the α-Al2O3 platelets prepared by molten-salt precipitation. In this study, the complex gel was crystallized in the temperature range of 400~1,200oC and after drying at 110oC, the effect of aging time on precipitation temperature, the size, thickness, morphology and particle size distribution of the α-Al2O3 platelets were investigated. As aging time passed, the α-Al2O3 platelets showed a tendency toward an increase in size and thickness as a result of an increase in BET surface area and pore volume of the AlO(OH) nano gel.