Abstract

Two yttria-doped zirconia powders (3Y-ZrO2) with identical bulk chemical composition and some differences in physical properties were characterized. Dispersibility of aqueous slips was evaluated by the measurement of zeta potential, apparent viscosity and particle size of the solid phase in slip. The results were in good agreement to indicate the pH range of stabilization and the state of dispersion. The effect of steric stabilization by an anionic polyelectrolyte on the isoelectric point and zeta potential was investigated. Full dispersion of one powder was accomplished in acidic range of pH whereas for the other one in basic pH. The differences in rheology of these slips which can not be explained by differences in physical properties may be attributed to the surface chemistry of powders.

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