Abstract
Al2O3-SiO2 composite powder was prepared by sol-gel method, using TEOS and AlNO3 as the main raw material .XRD, SEM and the specific surface analyzer were used to characterize the powder. The results showed that powder obtained by calcining xerogel of the molar ratio of SiO2/Al2O3=1:1.5 at 1200°C had high crystallinity and purity , homogeneous distribution and small particle size that was 100-200nm. Its specific surface area decreased with the increase of the calcining temperature. The main phase of xerogel was amorphous silica. After xerogel was calcined at 400°C, 600°C and 800°C respectively, the phase of obtained powder was also amorphous silica. But at 1000°C and 1100°C respectively, small amounts of Al-Si spinel were produced. At 1200°C, the powder was all mullite and Al-Si spinel did not exist completely.
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