Abstract
The influence of ZrO2 on the crystallization behavior, microstructure, and machinability of SiO2-Al2O3-MgO-K2O-B2O3-F glasses was investigated. The crystallization of the glass-ceramic was markedly affected by addition of ZrO2. These glasses crystallize more rapidly. The number of mica crystals increases, whereas the size of the mica crystals decreases drastically. Machining of these glass-ceramics was found to be good, as confirmed by a drilling test using conventional steel tools. Such mechanical properties are attributable to the microstructure of these glass-ceramics. Very fine crystals are homogeneously distributed in glass matrix.