Platelet alumina powders have been synthesized by introducing AlF_3 as crystalline transformation additive. The influence of the additive contents on the phase transformation of the start material Al(OH)_3 was studied by SEM, the effect of calcination temperatures on the phase transformation and microstructure of alumina powder were investigated by TG-DSC, XRD and SEM. The results indicate that uniform platelet powders could be abtained while more than 15% AlF_3 was introduced. When the calcination temperature higher than 1100°C pure α-Al_2O_3 could be synthesized, comparing to the tranditional preparation of platelet alumina powders, the remarkable advantages of the method are low calsination temperature, small particle size and simple process.
展开▼
