Yb_2O_3对Y—TZP陶瓷材料的显微结构和力学性能的影响

Microstructure and Mechanical Properties of Yb-Y-TZP

采用Yb_2O_3、Y_2O_3复合稳定剂，制得了高强度、高韧性的四方相氧化锆陶瓷材料（Yb－YTZP）．用XRD研究了材料的相组成及断裂相变量；用SEM观察了材料的显微结构．分析了力学性能与断裂相变量及显微结构的关系，发现在YTZP材料中掺入0～3mol％Yb_2O_3，可使材料在保持原有抗弯强度的同时，一定程度地改善断裂韧性．实验结果表明，如果用Yb_2O_3来提高Y-TZP的时效性能及耐热冲击性，不会影响Y-TZP原有的优良力学性能．

Yb-Y-TZP with high flexural strength and excellent fracture toughness was acquired with the complex stablizers containing Yb2O3 and Y2O3. XRD was used to investigate the phase composition and increment of monoclinic phase content before and after fracture. The microstructure of Yb-Y-TZP was observcd and grain size was deterimmed by SEM. The relationship between the mechanical properties, microstructure and the increment of monoclime phase content was studied.It was found that the fracture toughness was improved with the original flexural strength by doping O～3 mol% Yb2O3 in Y-TZP. The experimental results showed that the excellent mechanical properties were not decreased if Yb2O3 was added in Y-TZP to inhibit the low temperature aging and to improve the thermal shock resistance.