Morphology Control of Ultrafine α-Al_2O_3 Powder Prepared by Homogenous Precipitation

Using Al2(SO4)3·18H2O and CO(NH2)2 as raw material,ultrafine α-Al2O3 power was obtained by calcining the precursor Al(OH)3 prepared by homogeneous precipitation method.The products were detected by laser particle size analyzer,SEM,XRD and DEC etc.The results indicated that the categories of anions,initial molar concentration of Al3+,reaction temperature and reaction time had significant effect on the particle morphology of the product.Effective control of the product morphology was realized and the spherical ultrafine α-Al2O3 powder with well-dispersed,particle size about 2 μm and homogenous particle size distribution was obtained by optimizing the reaction conditions.