Platelet alumina powders have been synthesized by introducing AlF3 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％ AlF3 was introduced.When the calcination temperature higher than 1100°C pure α-Al2O3 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.
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