The glass substrate and the glass substrate null for PDP

摘要

PROBLEM TO BE SOLVED: To ensure a high glass transition temp. and light in weight and to improve scuffing resistance, and heat resistance by incorporating SiO₂, Al₂O₃, MgO, CaO, SrO, BaO, Na₂O and K₂O. ;SOLUTION: A mixture is prepd. by mixing, by weight, 56-72% SiO₂ with 1-14% Al₂O₃, 0-9% MgO, 0.5-11% CaO, 0-4% SrO, 0-3% BaO (6%≤MgO+CaO+ SrO+BaO≤14%), 0-9% Na₂O and 6-20$% K₂O (6%≤Na₂O+K₂O≤20%). This mixture is melted by heating to 1,500-1,600°C, vitrified and molded to obtain the objective glass compsn. for a substrate having ≤7,400m^-1/2 brittleness index, a specific gravity of ≤2.6, ≥600°C glass transition temp., 75×10^-7-90×10^-7/°C average coefft. of thermal expansion in the range of 50-350°C and ≥85% spectral transmissivity at 425-475nm, 510-560nm and 600-659nm.;COPYRIGHT: (C)1997,JPO