Colloidal Dispersion of High Solid Loading ZnO Powders with 2 wt% Al2O3 Stabilized with Polyelectrolyte

The high solid loading slurries with ZnO-Al2O3powders stabilized with polyelectrolytes have been studied. The influence of Sodium poly(acrylate) (PA 30) on the fluidity and stablility of the slurries was investigated. Morphological features of ZnO-Al2O3powders in suspension and fracture surface of green compact were observed using TEM and SEM. The slurries with pH 9 were prepared after milled using ZnO mixed powders and the PA 30 solution of pH 8. As 0.2 wt% PA 30 added, the lowest viscosity and the highest sediment were obtained. ZnO and Al2O3particles had been homogeneous dispersed. The maximum density (66.7 %TD) of green compact was obtained.