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The basic glass of Li_2O-Al_2O_3-SiO_2 system using P_2O_5 as nucleator was prepared by means of conventional melt quenching technology, and the heat-treatment process was determined by using differential thermal analysis. The crystalline phases and the microstructure of the glass-ceramics were investigated by using X-ray diffraction and scanning electron microscopy. The results show that the glass based on Li_2O-Al_2O_3-SiO_2 oxides using P_2O_5 as nucleator can be prepared at lower melt temperature of 1 450 ℃ and the glass-ceramics with lower thermal expansion coefficient of 21.6×10~(-7) ℃~(-1) can also be obtained at 750 ℃. The glass-ceramics contain a few crystal phases in which the main crystal phase is β-quartz solid solution and the second crystal phase is β-spodumene solid solution. When the heat treatment temperature is not higher than 650 ℃, the transparent glass-ceramics containing β-quartz solid solution can be prepared. β-quartz solid solution changes into β-spodumene solid solution at about 750 ℃. And the appearance of the glass-ceramics changes from translucent, part opaque to complete opaque with increasing (temperature.)
The basic glass of Li 2 O-Al 2 O 3 -SiO 2 system using P 2 O 5 as nucleator was prepared by means of conventional melt quenching technology, and the heat-treatment process was determined by using differential thermal analysis. The crystalline phases and the microstructure of the glass-ceramics were investigated by using X-ray diffraction and scanning electron microscopy. The results show that the glass based on Li_2O-Al_2O_3-SiO_2 oxides using P_2O_5 as nucleator can be prepared at lower melt temperature of 1 450 ℃ and the glass-ceramics with lower thermal expansion The glass-ceramics contain a few crystal phases in which the main crystal phase is β-quartz solid solution and the second crystal phase β-quartz solid solution changes into β-quartz solid solution. When the heat treatment temperature is not higher than 650 ° C, the transparent glass- And the appearance of the glass-ceramics changes from translucent, part opaque to complete opaque with increasing (temperature.)