In this research work,samples were prepared by doping different concentration of HfO2 ranging from 0.5 to 10 mol%as stabilizer in Y-TZP material,to investigate its influence on the microstructure,mechanical properties and low temperature aging performance of zirconia materials.Solid solution method was introduced to dope the HfO2 atoms into the zirconia crystal structure.Results show that doping 0.5 mol%of HfO2 can decrease the grain size of zirconia,while improve the mechanical properties and restrain the low temperature degradation.For the case when 0.5 mol%HfO2 was doped,the grain size decreases from 0.41 ± 0.11 μm to 0.28 ± 0.09 μm.The flexure strength has been noted to increase from 867.4 ± 57.7 MPa to 1167.1±90.7 MPa,also improve its low temperature aging resistance.After aging 72 h,the fraction of M-phase has been found lower and the flexure strength higher.
Y-TZP HfO2 low temperature degradation grain size flexure strength
Rong Binbin Zhang Liu Yin Haiqing Khan Dil Faraz Zheng Qingjun Qu Xuanhui
Lab of Particulates and Powder Metallurgy,University of Science and Technology Beijing,Beijing 10008 Materials Design Group in Collaborative Innovation Center of Steel Technology,University of Science Materials Design Group in Collaborative Innovation Center of Steel Technology,University of Science Department of Physics,University of Science and Technology Bannu,Bannu 28100,Pakistan Kennametal Inc.1600 Technology Way Latrobe,PA,15650,USA Lab of Particulates and Powder Metallurgy,University of Science and Technology Beijing,Beijing 10008