A Study Of Yb-Ce-TZP Toughening Ceramic Materials

It was studied systematically that the stuff characteristics , sintering properties , microstructures , phase compositions before and after fracture , mechanical properties , aging behaviour , thermal shock resistance of the Yb-Ce-TZP and which how to be influenced by the stabilizer's compositions.Furthermore,It was discussed that the mechanisms Yb₂O₃,Y₂O₃ and CeO₂ keep the stability of ZrO₂ tetragonal phase and the martensitic transformation enhances the fracture toughness of Yb-Ce-TZP.Thermal analyses showed that ZrO₂(Yb₂O₃,CeO₂,Y₂O₃) gels are dehydrated to amorphous ZrO₂ from Zr(OH)₄ at 100 300 ℃, translated to tetragonal phase ZrO₂ nearby 500 ℃,and that ZrO₂ superfine powders is easier to sinter when the gels were calcinated at 700 ℃; ZrO₂(Yb₂O₃,CeO₂,Y₂O₃) superfine powders appear to be a weakly aggregate state by TEM, and the grain size is under 50nm by BET;The sintering experiments showed that a over 98% relative density can be acquired by sintering green bodies at 1530 ℃ for 2h under ambient pressure;SEM approved that compact sintering bodies possess the structure characteristics that there is a even size for all the tetragonal phase grains which is full-grown and aligning trimly.Moreover,grain size investigation displayed that grain size increases continually with sintering temperature increasing and CeO₂ content adding;XRD studies evinced that the stabilizers composed of Yb₂O₃ and CeO₂ improved the transforming ability of tetragnonal ZrO₂,aggrandized the monoclinic phase increment after fracture,therefore evidently enhanced the flexural strength and fracture toughness at ambient temperature.Especially,the flexural strength and fracture toughness of 0.70Yb8.85Ce-TZP is 766MPa and 9.8MPa.m^1/2 respectively,which is...