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The dispersion of concentrated 0.53 mm yttria stabilized zirconia (YSZ) aqueous slip to achieve sintered compacts with high and uniform microstructure was investigated. 78 wt.% (37.5 vol%) and 83 wt.% (45.3 vol%) slips were prepared by dispersing the powder in water with ammonium polyacrylate (NH4PA) at pH values in a range of 89.5. The influences of the amount of NH4PA and pH on the rheological properties of microstructure was investigated. 78 wt.% (37.5 vol%) and 83 wt.% (45.3 vol%) slips were prepared by dispersing the powder in water with ammonium polyacrylate (NH4PA) at pH values in a range of 89.5. The influences of the amount of NH4PA and pH on the rheological properties of mm yttria stabilized zirconia (YSZ) aqueous slip to achieve sintered compacts with high and uniform microstructure was investigated. 78 wt.% (37.5 vol%) and 83 wt.% (45.3 vol%) slips were prepared by dispersing the powder in water with ammonium polyacrylate (NH4PA) at pH values in a range of 89.5. The influences of the amount of NH4PA and pH on the rheological properties of4PA) at pH values in a range of 89.5. The influences of the amount of NH4PA and pH on the rheological properties of 78 and 83 wt.% slips were studied. The minimum viscosities of 78 and 83 wt.% slips were obtained with the addition of 0.050.1 wt.% NH4PA at pH 9. Increasing pH from 8 to 9.5 had no effect on the YSZ dispersion with NH4PA. These dispersions yielded green densities of 63% of theoretical density (TD) and sintered to 98% TD at 1400 8C. density (TD) and sintered to 98% TD at 1400 8C. pH 9. Increasing pH from 8 to 9.5 had no effect on the YSZ dispersion with NH4PA. These dispersions yielded green densities of 63% of theoretical density (TD) and sintered to 98% TD at 1400 8C. density (TD) and sintered to 98% TD at 1400 8C. pH 9. Increasing pH from 8 to 9.5 had no effect on the YSZ dispersion with NH4PA. These dispersions yielded green densities of 63% of theoretical density (TD) and sintered to 98% TD at 1400 8C. density (TD) and sintered to 98% TD at 1400 8C. density (TD) and sintered to 98% TD at 1400 8C.