Corning Incorporated
Y2O3-CONTAINING GLASS COMPOSITIONS, SUBSTRATES, AND ARTICLES

Abstract:

A glass substrate formed from a glass composition is disclosed. In embodiments, the composition comprises: from 60 mol. % to 75 mol. % SiO.sub.2; from 2 mol. % to 15 mol. % Li.sub.2O; from 1.9 mol. % to 15 mol. % Y.sub.2O.sub.3; and at least one of B.sub.2O.sub.3 and Na.sub.2O. B.sub.2O.sub.3+Na.sub.2O is from 2 mol. % to 13 mol. %. Y.sub.2O.sub.3+Al.sub.2O.sub.3 is from 10 mol. % to 24 mol. %. A ratio R.sub.2O/Al.sub.2O.sub.3 is from 0.5 to 4, where R.sub.2O is a total concentration of Li.sub.2O, Na.sub.2O, K.sub.2O, Rb.sub.2O, and Cs.sub.2O. (R.sub.2O+RO)/Al.sub.2O.sub.3 is from 0.5 to 4.5, where RO is a total concentration of BeO, MgO, CaO, SrO, and BaO. The glass substrate has a Young's modulus from 75 gigapascals (GPa) to 110 GPa. The glass substrate is ion exchangeable to form a strengthened glass article.