Fabrication and Characterization of Mono-dispersed Al_2O_3 Powders

Alumina precursors were synthesized from Al_2(SO_4)_3×18H_2O and CO(NH_2)_2 by homogeneous precipitation method.Then,fine α-Al_2O_3 powders with superior characteristics were fabricated from alumina precursors.Effects of reaction temperature and adding dispersants ratio on particle size,distribution of particle size,as well as morphology of Al_2O_3 powders,were systematically studied.This study provides theoretical basis for preparing monodispersed Al_2O_3 powders.The results show that,on the optimum experimental condition,the approximately monodispersed spherical Al_2O_3 powders,with small particle size(D_(1/2)=1.60mm),narrow particle size distribution range(σ=0.93μm),and without obvious agglomeration, were obtained.Such fine Al_2O_3 powders can be used as raw materials for fabricating Al_2O_3 ceramic with superior properties.