Effect of TiO2 and MgO additions on microstructures of Al2O3

By using pressureless sintering technique, the samples of Al2O3 with anisotropic grains through the doping of small amount of TiO2 and MgO were prepared. The effects of quantity of TiO2 and MgO and sintering temperature on the microstructure of Al2O3 were also investigated. The doping of MgO makes the grains of Al2O3 smaller in contrast to the ones in Al2O3 doped with pure TiO2. It is possible to adjust the aspect ratio of Al2O3 grains and gain a homogeneous microstructure in Al2O3 by means of changing the amount of MgO additions in the material.