The effect of washing on the stability, electrophoretic deposition (EPD), and density of consolidated body for aqueous and nonaqueous suspensions of as-received zirconia (TZ3Y), Tosoh Corp.) and alumina fine particles are presented. An increase in the zeta potential and a decrease in the particle size of the zirconia-ethanol system were observed due to washing. As a result, the EPD rate increased dramatically from the as-received condition. There were no significant beneficial effects of washing on the aqueous system, indicating a much greater sensitivity to ionic contaminants in an ethanol suspension, especially for zirconia. Green densities prepared by EPD suing aqueous suspensions were higher than those prepared by EPD using ethanol suspensions and similar to those obtained by slip casting using aqueous suspensions.
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