Patent ID: 11912615
Assignee: CORNING INCORPORATED
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC B  C

Claim 13:
14. A method of increasing probability of survival after multiple drops of a glass-based article onto one or more hard surfaces comprising:
exposing to an ion exchange treatment a glass-based substrate comprising opposing first and second surfaces defining a substrate thickness (t) to form a glass-based article with a stress profile comprising a knee, the glass-based article comprising:
a central composition at the at the center of the glass-based article comprising a K2O content of greater than or equal to 0.3 mol % K2O to less than or equal to 4 mol % K2O, and a Li2O/Na2O molar ratio of greater than or equal to 0.65 and less than or equal to 1.2;
an alkali metal oxide comprising a non-zero concentration that varies from the first surface to a depth of layer (DOL) with respect to the alkali metal oxide; and
a fracture toughness corresponding to the central composition in the range of greater than or equal to 0.7 MPa*sqrt(m) to less than or equal to 1.3 MPa*sqrt(m).