Preparation of Dental Zirconia Toughened Composite Alumina Ceramic

Objectives: To investigate the effects of capabilities about Zirconia Toughened Glass Infiltrated Nanometer-ceramic Composite in ways of the methods of taking shape, sintering temperature and adding sintering auxiliaries, to find out the best techniques to prepare zirconia toughened composite alumina ceramic. Methods: The sintering auxiliaries (TiO2, MgO, SiO2) were added into Al2O3-ZnO2 nanometer-ceramic composite powder, the powder was taken shape with pressure dryly, and sintered under a low temperature. The densities and Vickers hardness of the infiltrated ceramic were measured, and the microstructures of those sections were examined by scanning electronic microscope, to evaluate the effects of those capabilities. Results: The higher the pressure is, while the powder was taken shape, the higher the density and Vickers hardness of infiltrated ceramic are. The ceramic crystal form develops more completely at 1450ºC than that of at 1200ºC. The grains grew perfectly and roundly, distribute uniformly, there was less sealed porosity, and the gas hole were exit on the surface of grain boundary in the group which contains with 1.05wt% MgO. The sintered body, containing with TiO2, could be sintered completely than other groups at the same temperature. Conclusion: The numerical value of prior density and Vickers hardness of sintering body can be risen while given higher pressure. It helps to sinter at a lower temperature (1450ºC) when adding sintering auxiliaries into Al2O3-ZnO2 Nanometer-ceramic Composite and the suitable content of MgO is 1.05wt%.