Abstract:

     We addressed the effects of different ZnO content on the crystallization behavior and property of the Li₂O-ZnO-SiO₂ glass system with differential scanning calorimeters (DSC), x-ray diffraction (XRD) and scanning electronic microscope (SEM). Experimental results show that its precipitated phases are cristobalite, tridymite, Li₂SiZnO₄and SiO₂. The relative cristobalite content initially increases and then decreases with the increase of ZnO content. The cristobalite phase influenced thermal expansion coefficient α also initially increases and then decreases. The relative cristobalite content reaches the highest value when the ZnO content arrives at 21.1%.Its thermal expansion coefficient α reaches the maximum value of 19.13×10-6/℃ when the ZnO content arrives at 26.7%.

Key words: glass-ceramic, nucleating agent, ZnO, Li₂O-ZnO-SiO₂ glass system