Y_2O_3,CeO_2掺杂的Mg-PSZ陶瓷材料研究

Mg-PSZ Ceramics Doped with Y_2O_3 and CeO_2

采用传统的陶瓷工艺制备少量掺杂Ｙ２Ｏ３ ， ＣｅＯ２ 的ＭｇＰＳＺ 陶瓷， 材料在较低的温度（ ≤１５５０℃） 下烧结致密并实现了微晶化（ 晶粒尺寸～１０ μｍ） 。探讨了Ｙ２Ｏ３ ，ＣｅＯ２ 的复合稳定作用和１１００ ℃热处理过程对材料相组成、显微结构和力学性能的影响。经１１００ ℃适当时间热处理， Ｙ２Ｏ３ ，ＣｅＯ２ 的复合稳定作用有效抑制亚共析分解反应发生， 优化调整ｃＺｒＯ２ 晶粒中的ｔＺｒＯ２ 析出体成核长大过程。断裂特征为穿晶、沿晶兼有， 相变增韧和微裂纹增韧的协同效应使材料具有优良的力学性能。

Mg PSZ ceramics doped with Y 2O 3 and CeO 2 were prepared using traditional processing method. The fine grain PSZ ceramics( d c10 μm) sintered at low temperature(1550 ℃) was obtained by means of composition design. The effect of co stabilization of Y 2O 3, CeO 2 and anneal process at 1100 ℃ was studied on material composition, microstructure and mechanical properties. The results show that Y 2O 3 and CeO 2 during annealing at 1100 ℃ can inhibit sub eutectoid decomposition reaction effectively, and adjust optimum conditions of precipitates of t ZrO 2 in c ZrO 2 grain nucleation and growth. The materials showed transgranular and intergranular fracture characteristics, and exhibit better mechanical properties owing to the coordinated effect of microcrack toughening and stress induced transformation toughening.