Abstract
The crystallization process of the rapidly quenched glasses in the system Li2O-K2O-Al2O3-SiO2-F has been investigated. Batches of the lepidolite composition were melted at 1773K for 10 minutes and quenched with a twin roller aparatus. Lepidolite and β-eucryptite were precipitated at 773K and 873K, respectively. However, it was requisited to keep the glass at 773K for more than 1 hour for the precipitation of lepidolite. The thermal conductivity of the glass-ceramics heated at 773K for 1hour and then at 973K for 2hours was larger than fluorphrogopite glass-ceramics, and its thermal expansion coefficient and dielectric properties were similar to those of fluorphrogopite glass-ceramics.
