Effects of TiO2 on Crystallization of ZnO-Al2O3-SiO2 Glass
Takashi WAKASUGI, Yoshiyuki OZASA, Kohei KADONO and Rikuo OTA
Abstract:The effects of TiO2 on the crystallization behaviors of ZnO-Al2O3-SiO2 glasses were investigated for the preparation of transparent glass ceramics containing ZnAl2O4 nano-crystal. Nucleation in 20ZnO・20Al2O3・60SiO2 glass proceeded vigorously at the temperature range between 660°C and 780°C, which decreased with the increase of TiO2 content. The nucleated samples with TiO2 more than 4mol% were transparent after crystallization. Acceleration of the nucleation by the addition of TiO2 was confirmed by the fact that the addition of TiO2 made the crystal size smaller. Key Words: Crystallization, Nucleation, Glass ceramics, DTA, ZnAl2O4, TiO2, Transparency