Microstructure and Mechanical Properties of Yb-Y-TZP

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.