细晶铈、镁复合稳定PSZ陶瓷的制备及性能研究

摘要

Powders were prepared by mechanical milling-mixing process, inwhich industrial zirconia was used as the main starting material and CeO2，MgO as co-stabiliz ing agents and α-Al2O3 as particle additions. Fine-grained PSZ ceramics si ntered 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·m1/2, respectively. The critica l temperature of thermal-shock resistance was about 750℃, which attribute to mi crocrack toughening mechanism. After hydrothermal treatment (180℃，1MPa, in di s tilled water) up to 20h, (Ce,Mg)-PSZ/MgAl2O4 ceramics exhibited much better hydrothermal stability.%以工业ZrO2为主要原料，CeO2，MgO及α-Al2O3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(≤1550℃)下，经1100℃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655MPa，断裂韧性在15MPa·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CeO2作为复合稳定剂的PSZ陶瓷材料具有较好的抗水化性能。