Preparation of well dispersed suspensions suitable for spray drying

摘要

A procedure for making well dispersed suspensions containing mixtures of WC and Co powders displaying a low viscosity which remain stable over an extended period of time is described. The suspensions are prepared in aqueous or ethanolic media using a cationic polyelectrolyte - polyethylenimine - at the inherent pH of the mixture. The method is particularly useful for making robust slurries for subsequent spray drying of free flowing granules to be used in the fabrication of cemented carbide bodies.