抄録
The purpose of this study is to examine the effects of some oxide additives on the grain growth and transformation behaviors of ceria doped tetragonal zirconia (Ce-TZP) to improve its mechanical properties. Monolithic Ce-TZP and some alkaline earth oxide (CaO, SrO and BaO) doped Ce-TZP were fabricated by the pressureless sintering technique at 1500 to 1700°C in air atmosphere. The grain growth of ZrO2 matrix was suppressed by doping alkaline earth oxide. BaO doping induced the transformation of Ce-TZP, whereas CaO doping was effective in stabilizing the tetragonal phase of CeTZP. CaO-doped Ce-TZP exhibited the high strength over 1000MPa. BaO doped Ce-TZP increased the fracture toughness of monolithic Ce-TZP. There was no effect of SrO-doping on transformation behavior and mechanical properties for Ce-TZP. The relationship between the microstructure and mechanical properties of oxide doped Ce-TZP were discussed.
