Effect of Silicon Carbide Additions on the Crystallization Behavior of a Magnesia-Lithia-Alumina-Silica Glass

Glass in the MgO‐Li2O‐A12O3‐SiO2 system was observed to crystallize readily at temperatures from 700° to 900°C. The primary crystalline phase evolved was Li2Si2O5, and the secondary phase evolved was Li2SiO3. The glass was amorphous after heating in air at 1050°C for 30 min. The addition of 0.5 wt% SiC powder resulted in the crystallization of Li2SiO3 during heating in air at 1050°C for 30 min. It was suggested that the difference in crystallization behavior with Sic addition was due to dissolution of Sic into the oxide glass.