目的 探讨添加微量稀土氧化物对牙色四方多晶氧化锆(Y-TZP)陶瓷的机械性能的影响.方法 以稀土氧化物(Pr6011、CeO2、Er2O3)和过渡元素氧化物(Mn02)为着色剂,采用粉体掺杂方法在Y-TZP粉体中添加不同质量分数的着色剂,制备出6组牙色Y-TZP,测试其机械性能(包括弯曲强度、维氏硬度、断裂韧性),并通过扫描电子显微镜观察各组陶瓷烧结体断裂面的显微结构,分析其断裂模式.结果 6组牙色Y -TZP的弯曲强度为(792±20)～(960±17) MPa,断裂韧性为(4.72±0.31) ～ (5.64±0.38) MPam1/2,维氏硬度为(1332±19)～(1380±17) MPa;显微结构显示6组陶瓷均呈致密的多晶结构,断裂模式为混合型断裂.结论 以稀土氧化物作为着色剂制备的Y-TZP具有较好的断裂韧性和维氏硬度,可满足口腔临床的应用要求.%Objective To evaluate the influence of mechanical property of tooth-like yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) by adding rare earth oxide as colorants. Methods Six kinds of tooth-like Y-TZP were made by introducing internal coloration technology. The colorants included rare earth oxide (Pr6O11, CeO2, Er2O3) and transition element oxide (MnO2). Mechanical properties (flexural strength, vickers hardness and fracture toughness) were tested. Microstructure was examined by scanning electron microscope (SEM), and the fracture model was analyzed. Results The range of flexural strength of the six kinds of tooth-like Y-TZP were (792±20)- (960+17) Mpa, the fracture toughness were (4.72±0.31)-(5.64±0.38) MPam1/2, and the vickers hardness were (1 332±19)-(1 380±17) Mpa. SEM observation on the cross section of the six kinds of sintered composites showed a relatively dense polycrystal structure, and the fracture models was mixed type. Conclusion Tooth-like Y-TZP is acquired with better mechanical properties (fracture toughness and vickers hardness) by adding rare earth oxide as colorants. It is available for clinical application.
展开▼
