Glass compositions with low dielectric losses

摘要

Alkali-free glasses with low dielectric losses, thermal expansion coefficients of 3.15 to 4.97x10-6/ DEG C. in the temperature range from 20 DEG to 300 DEG C., adequate acid resistance, dielectric loss factors tan delta of 3.94 to 24.9x10-4 and processing temperatures (VA) of 1132 DEG to 1280 DEG C., have the following composition (in weight percent): 52.50-60.20 SiO2, 2.80-3.80 B2O3, 8-14 Al2O3, 6.0-20.20 PbO, 2.0-13.5 CaO, 0-3.5 MgO, 0-8 ZnO, 0-4.7 BaO, SIGMA PbO, CaO, MgO, ZnO, BaO 21.10-34.0, 0-1.0 F, 0.20-0.50 Sb2O3.