PREPARATION OF COATED PARTICLES BY INJECTION METHOD

Preparation of coated particles by an injection method was presented. The raw material of a coating layer is injected into a core particle s uspension in which a precipitant is dissolved. By this method, some co ated particles including titania hydrate-coated calcium carbonate powd ers and alumina hydrate-coated SiC whiskers were prepared. It was noti ceable that CaCO3, which is soluble in the raw material of titania hyd rate, could be coated vith titania hydrate. Furthermore, it was shown that aluminum nitrate and aluminum chloride as well as aluminum sulfat e were useful as the raw material salts. Homogeneous nucleation and co alescence of the homogeneous nuclei onto the coating layers were expec ted to be included in the coating process.