Microstructure and Mechanical Properties of Microwave Sintered ZrO2Bioceramics with TiO2Addition
The microwave sintered zirconia ceramics with 0, 1, 3, and 5 wt% TiO2addition at a low sintering temperature of 1300°C and a short holding time of 1 hour were investigated. Effect of contents of TiO2addition on microstructure and mechanical properties of microwave sintered zirconia bioceramics was reported. In the sintered samples, the main phase is monoclinic zirconia (m-ZrO2) phase and minor phase is tetragonal zirconia (t-ZrO2) phase. The grain sizes increased with increasing the TiO2contents under the sintering temperature of 1300°C. Although the TiO2phase was not detected in the XRD pattern, Ti and O elements were detected in the EDS analysis. The presence of TiO2effectively improved grain growth of the ZrO2ceramics. The Vickers hardness was in the range of 125 to 300 Hv and increased with the increase of TiO2contents. Sintering temperature dependence on the Vickers hardness was also investigated from 1150°C to 1300°C, showing the increase of Vickers hardness with the increase of the sintering temperature as well as TiO2addition.