Corning Incorporated
GLASS-BASED ARTICLES HAVING HIGH STRESS MAGNITUDE AT DEPTH

Abstract:

Glass-based articles have a first surface and a second surface opposing the first surface defining a thickness (t) and a center between the first surface and the second surface, the glass-based article containing Li.sub.2O, ion-exchanged potassium and ion-exchanged sodium. The glass-based article has a stress profile including a hump stress region extending from the first surface (or a point below the first surface) to an apex in a range of 0.001t and 0.1t. Compressive stress at the apex is from 25 to 750 MPa. The hump region comprises an area of increasing stress and an area of decreasing stress. Depth of compression is from 0.1t to 0.25t. A tensile stress region extends from the depth of compression to a maximum tensile stress.