LITHIUM ALUMINOSILICATE GLASS HAVING A HIGH E-MODULE AND METHOD FOR THE PRODUCTION THEREOF

摘要

The invention relates to lithium aluminosilicate glass and to a method for the production of lithium aluminosilicate glass, the glass having the following composition (in mol%): 60 - 70 SiO2; 10 - 13 Al2O3; 0.0 - 0.9 B2O3;9.6 - 11.6 Li2O; 8.2 - 2O; 0.0 - 0.7 K2O; 0.0 - 0.2 MgO; 0.2 - 2.3 CaO; 0.0 - 0.4 ZnO; 1.3 - 2.6 ZrO2; 0.0 - 0.5 P2O5; 0.003 - 0.100 Fe2O3; 0.0 - 0.3 SnO2; 0.004 - 0.200 CeO2. The following ratios and conditions apply to the glass according to the invention: (Li2O+Al2O3) / (Na2O+K2O) > 2; 0.47 2O/ (Li2O+Na2O+K2O) 2O3+ZnO+P2O5+B2O3+CeO2 < 3, wherein at least four of the six oxides are contained. Such a lithium aluminosilicate glass has an E-module of at least 82 GPa. Moreover, it has a glass transition temperature Tg of less than 540 °C and/or a processing temperature of less than 1150 °C. The glass is suitable for shaping by means of a float process and can be chemically and/or thermally tempered so that it can have a bending strength of at least 550 N/mm2.