Low Li2O content study in Li2O-Al2O3-SiO2 glass-ceramics.

The price of lithium-containing minerals and other chemical materials continues to increase, resulting in an increase in the production cost of Li 2 O-Al 2 O 3 -SiO 2 (LAS) system glass-ceramics. In the LAS glass-ceramics component, the reduction in the amount of Li 2 O used can reduce the cost of the product. It is worthwhile to study whether it is possible to prepare glass-ceramics with low expansion properties under low Li 2 O content. The effect of Li 2 O content on the glass-ceramics of LAS system was studied. In this paper, spodumene was used as the main raw material, and TiO 2 and ZrO 2 were added as crystal nucleating agents to prepare transparent glass-ceramics with low expansion coefficient. The effects of the change of Li 2 O content on the crystal phase and microstructure of glass-ceramics were investigated by XRD, DSC, FTIR and SEM. The results show that the main crystalline phase of the low expansion transparent glass-ceramics is β-quartz solid solution. When Li 2 O content is in the range of 2.99 wt% to 4.13 wt%, low expansion glass ceramics can be prepared by an appropriate method. With the increase of Li 2 O content, the average coefficient of thermal expansion (CTE) in the temperature range of 30 °C–300 °C shows a decreasing trend. When Li 2 O content is in the range of 3.51 wt% to 4.13 wt%, the thermal expansion coefficient of the glass ceramics is extremely small, and even a negative expansion coefficient occurs. [ABSTRACT FROM AUTHOR]