HUANG  Mingchu ,SUN  Yu, GONG  Xi

(Key Laboratory of Non-ferrous Materials Science and Engineering of Ministry of Education, Central South University,

Changsha Hunan 410083, China)

Abstract:Li₂O-ZnO -SiO₂ glass -ceramics containing nucleating agent TiO₂ were prepared by conventional melt quenching technique. The crystallization kinetics of the glass was studied using Johnson-Mehl-Avrami equation and the influences of heating treatment condition on crystallization behavior and microstructure were discussed by XRD and SEM. The results show the crystallization process includes two stages. The initial crystalline phase is γⅡ-LZS in spherical shape. When the heating temperature is higher than 760℃, cristobalite phase appears. The activation energies of γⅡ-LZS and cristobalite by Kissinger equation are 315.2KJ/mol and 343.7KJ/mol respectively.

Keywords:Li₂O-ZnO-SiO₂ glass, glass-ceramics, TiO₂, crystallization kinetic