细晶铈、镁复合稳定PSZ陶瓷的制备及性能研究

Preparation and Properties of Fine-grained (Ce,Mg)-PSZ/MgAl_2O_4 Ceramics

以工业 Zr O2 为主要原料 ,Ce O2 ,Mg O及 α- Al2 O3作为复合稳定剂及颗粒添加剂 ,采用机械球磨混合法制备粉料 ,进而在较低的固溶烧结温度 (≤ 15 5 0℃ )下 ,经 110 0℃适当时间热处理 ,制备出具有较好力学性能的细晶 PSZ陶瓷材料 ,其室温强度约 6 5 5 MPa,断裂韧性在 15 MPa· m1 / 2 左右 ;所制备细晶 PSZ材料的临界热震温差△ Tc在750℃左右 ,其中微裂纹增韧机制的存在对材料的抗热震性有积极作用 ;在 ( 180℃ ,1MPa)水热条件下 ,采用 Ce O2 作为复合稳定剂的

Powders were prepared by mechanical milling mixing process, in which industrial zirconia was used as the main starting material and CeO 2,MgO as co stabilizing agents and α Al 2O 3 as particle additions Fine grained PSZ ceramics sintered at low solid solution temperature (≤1550℃)and annealed at 1100℃ had good mechanical properties :the flexural strength and fracture toughness at room temperature were about 655MPa and 15MPa·m 1/2 , respectively The critical temperature of thermal shock resistance was about 750℃, which attribute to microcrack toughening mechanism After hydrothermal treatment (180℃,1MPa, in distilled water) up to 20h, (Ce,Mg) PSZ/MgAl 2O 4 ceramics exhibited much better hydrothermal stability