LOW CTE, ION-EXCHANGEABLE GLASS COMPOSITIONS AND GLASS ARTICLES COMPRISING THE SAME

摘要

Glass compositions and glass articles comprising the glass compositions are disclosed. In one embodiment, a glass composition includes from about 65 mol. % to about 70 mol. % SiO2; from about 9 mol. % to about 14 mol. % Al2O3; and from about 0 mol. % to about 11 mol. % B2O3 as glass network formers. The glass composition also includes from about 5 mol. % to less than 10 mol. % alkali oxide R2O, wherein R is at least one of Li, Na, and K. The glass composition also includes from about 3 mol. % to about 11 mol. % of divalent oxide MO, wherein M is at least one of Mg, Ca, Ba, SrO and Zn. The glass composition has a coefficient of thermal expansion which is less than or equal to 55×10-7/° C. and is amenable to strengthening by ion-exchange. The glass composition is well suited for use as the glass cladding layers of a laminated glass article.

主权项

1. A glass composition comprising:
from about 65 mol. % to about 70 mol. % SiO2; from about 9 mol. % to about 14 mol. % Al2O3; from about 0 mol. % to about 11 mol. % B2O3; from about 5 mol. % to less than 10 mol. % alkali oxide R2O, wherein R is at least one of Li, Na, and K; and from about 3 mol. % to about 11 mol. % of divalent oxide MO, wherein M is at least one of Mg, Ca, Ba, SrO and Zn, wherein an average coefficient of thermal expansion of a glass formed from the glass composition is less than or equal to 55×10−7/° C., a compressive stress in the glass composition is greater than or equal to 400 MPa following ion-exchange in a 100% KNO3 salt bath at 410° C. for 8 hours, and a liquidus viscosity greater than or equal to 35 kPoise.