In order to improve the mechanical properties of 8YSZ ceramic, the 8YSZ bimodal particle sizes powders were dry pressed and pressureless sintered. The molding process parameters including the molding pressure, pressure holding time and dosage of binder were optimized. The sintering scheme based on orthogonal test was designed. The influence of the sintering process parameters including sintering temperature, heating rate, holding time, sintering method on the sintering properties and mechanical properties of 8YSZ was discussed and their optimization value were obtained. The results show that the green ceramic with the relative density of 54.9% can be obtained by adopting the optimized molding process parameters with the dosage of PVA of 10%(mass fraction), the forming pressure of 10MPa, the pressure holding time of 30s. The 8YSZ ceramic with the relative density of 98.3% and the bending strength of 100.3MPa can be prepared by adopting the optimized sintering process parameters with the sintering temperature of 1500℃, holding time of 4h, heating rate of 5℃/min, sintering methods of naked burning.
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