Abstract: The rheological properties of slurry formed by nano-sized Y-TZP were studied. With the adding of dispersant NaPAA or NH₄PAA, the optimum pH range for the stable slurry is between 8 to 12. The relationship of the solid loading and the amount of dispersant was obtained. The slurry dispersed with NH₄PAA has lower viscosity comparing to tkat of NaPAA. The variation of viscosity with the specific surface area (SSA) of powders was discussed. The viscosity does not change greatly witk SSA if the solid coltent is less than 50wt%. When the solid content is 65wt%, the viscosity increases with SSA exponentially, the finer particles need more dispersant to adsorb to be flowable.

Key words: nano-sized, Y-TZP, stable slurry, rheological property