Abstract
This paper reports on the effect of TiO 2 on mullitization, anisotropic grain growth and densification of Al 2O 3 and SiO 2 mixtures, which are activated by a high-energy ball milling process using tungsten as milling media. High-energy activation significantly promotes mullitization in the mixture of Al 2O 3 and SiO 2 powders, and is a pre-requisite for the occurrence of anisotropic grain growth of mullite. There is a subtle interplay and competition between anisotropic grain growth and densification, depending on the amount of TiO 2. Small amount of TiO 2 has a positive effect on the phase formation and anisotropic grain growth of mullite, while high concentration of TiO 2 suppresses anisotropic grain growth, and thus is beneficial to densification. As a result, the microstructure and densification of the mullite ceramics can be manipulated by the doping levels of TiO 2.
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