FUSION FORMED AND ION EXCHANGED GLASS-CERAMICS

摘要

The present disclosure relates to fusion formable highly crystalline glass-ceramic articles whose composition lies within the SiO2--R2O3--Li2O/Na2O--TiO2 system and which contain a silicate crystalline phase comprised of lithium aluminosilicate (ß-spodumene and/or ß-quartz solid solution) lithium metasilicate and/or lithium disilicate. Additionally, these silicate-crystal containing glass-ceramics can exhibit varying Na2O to Li2O molar ratio extending from the surface to the bulk of the glass article, particularly a decreasing Li2O concentration and an increasing Na2O concentration from surface to bulk. According to a second embodiment, disclosed herein is a method for forming a silicate crystalline phase-containing glass ceramic.