Study on Mg-PSZ Ceramics Doped with Y_2O_3 and CeO_2

摘要

Mg-PSZ ceramics doped with Y_2O_3 and CeO_2 was prepared using traditional processing method. The fine-grain PSZ ceramics (d_c<=10μ m) sintered at low temperature *<=1550 deg C) was obtained by means of composition design. The effects of co-stabilization of Y_2O_3, CeO_2 and annealing at 1100 deg C on material composition, microstructure and mechanical properties were studied. The results show that Y_2O_3 and CeO_2 during annealing at 1100 deg C can inhibit subeutectiod decomposition reaction effectively, and optimize nucleation and growth of t-ZrO_2 precipitates in c-ZrO_2 matrix phase. The materials show transgranular and intergranular fracture characteristics, and exhibit better mechnaical properties owing to the cooperative effect of stress-induced transformation toughening and microcrack toughening.