GLASS CERAMIC, GLASS CERAMIC SUBSTRATE, OPPOSING SUBSTRATE FOR LIQUID CRYSTAL PANEL AND DUST PROTECTING SUBSTRATE FOR LIQUID CRYSTAL PANEL

摘要

PROBLEM TO BE SOLVED: To provide a glass ceramic and a glass ceramic substrate having characteristic such as low thermal expansion, high transmittance in the visible light area and a low specific gravity. ;SOLUTION: This glass ceramic is obtained by thermal treating of a specified base glass for glass ceramic to deposit a crystalline phase comprising -quarts- based solid solution, wherein the specified base glass comprises, in terms of mol%, 55 to 70 SiO₂, 13 to 23 Al₂O₃, 11 to 21 alkli metal oxides (provided that 10 to 20 Li₂O and total 0.1 to 3 Na₂O+K₂O), 0.1 to 4 TiO₂, and 0.1 to 2 ZrO₂, provided that the total of the above components is 95 mol% or more and further comprises 0 to less than 0.2 mol% of BaO, 0 to less than 0.1 mol% of P₂O₅, 0 to less than 0.3 mol% of B₂O₃, and 0 to less than 0.1 mol% of SnO₂. The glass ceramic substrate consists of the glass ceramic.;COPYRIGHT: (C)2003,JPO