Effect of Forming Pressure and Sintering Temperature on Thermal Expansion Property of Li_2O-Al_2O_3-P_2O_5-SiO_2 Glass-Ceramics

摘要

Li_2O--Al_2O_3-P_2O_5-SiO_2 xerogel powders were synthesized by sol-gel route and glass-ceramics were prepared under different forming pressure and sintering temperature. The effects of sintering temperature and forming pressure on coefficient of thermal expansion of prepared glass-ceramics were investigated by means of DTA-TG, TEC and XRD. The results indicate that xerogel powders crystallization begins at 785°C, and the main crystallite phases in the researched specimens are virgilite and cristobalite. The TEC decreases linearly with the forming pressure. When the sintering temperature is 950°C and forming pressure is 40MPa, a low TEC of 0.65 x 10~(-6) °C~(-1) can be obtained.