Patent ID: 11912614
Assignee: CORNING INCORPORATED
Field: Audio-visual technology (Electrical engineering)
Classification: CPC C  H | IPC B  C  H

Claim 16:
17. A method of manufacturing a glass-based article comprising:
exposing a glass-based substrate having opposing first and second surfaces defining a substrate thickness (t) to an ion exchange salt bath for a duration of less than or equal to 16 hours at a bath temperature of greater than or equal to 400° C. and less than or equal to 500° C. such that the glass-based article comprises a stress profile comprising:
a maximum compressive stress (CSmax) greater than or equal to 150 MPa;
a depth of compression (DOC) that is greater than or equal to 0.21t;
a peak central tension (CT) that is greater than or equal to 400-110 MPa and less than or equal to 220 MPa; and
the peak central tension (CT) in the tensile region that is greater than:
(E/68 GPa)*75 MPa*1 mm0.5/√(t),
where E is a Young's modulus value of a glass-based substrate having the same composition and structure as a center of the glass-based article,
wherein the stress profile further comprises a negative curvature region, wherein a second derivative of stress as a function of depth is negative.