Rheology of Concentrated Y TZP Aqueous Suspensions

Concentrated Y TZP aqueous suspensions(～50vol%) were prepared by employing poly acrylate(NaPAA and NH 4PAA) as dispersant Zeta potential of the suspensions was displaced to pH 2 2 by the adsorption of RCOO - group released by PAA salts in aqueous solution The viscosity was at its lowest point when NaPAA content was 1 8 wt% Solids loading and particle size significantly influenced the rheology of Y TZP suspensions Concentrated suspensions(35vol%)were typical Bingham fluid, second newtonian plateau was observed at high shear rate Plastic viscosity and yield value demonstrated sharp ascension in 50 vol% suspension under a shear rate of 20s -1 The appropriate particle size for preparing high solids loading Y TZP suspensions was about 350 nm