Corning Incorporated
Zircon compatible, ion exchangeable glass with high damage resistance

Abstract:

Glasses having a high degree of resistance to damage cause by abrasion, scratching, indentation, and the like are disclosed. In embodiments, the glasses may include at least 50 mol % SiO.sub.2; 9 mol % to 22 mol % Al.sub.2O.sub.3; Na.sub.2O; Li.sub.2O; at least 10 mol % R.sub.2O, wherein R.sub.2O is the sum of alkali metal oxides in the glass; 2.7 mol % to 4.5 mol % B.sub.2O.sub.3; and greater than 0.1 mol % of MgO+ZnO, wherein (B.sub.2O.sub.3--(R.sub.2O--Al.sub.2O.sub.3)) is greater than or equal to 3.