US 11,807,573 B2
Strengthened glass articles and methods of forming the same
Yuhui Jin, Painted Post, NY (US); Joshua James McCaslin, Beaver Dams, NY (US); Jong Se Park, San Jose, CA (US); Vitor Marino Schneider, Painted Post, NY (US); and Wei Sun, Painted Post, NY (US)
Assigned to Corning Incorporated, Corning, NY (US)
Filed by CORNING INCORPORATED, Corning, NY (US)
Filed on Aug. 23, 2022, as Appl. No. 17/893,798.
Application 17/893,798 is a continuation of application No. 17/318,547, filed on May 12, 2021, granted, now 11,434,167.
Claims priority of provisional application 63/025,562, filed on May 15, 2020.
Prior Publication US 2022/0402815 A1, Dec. 22, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. B32B 15/04 (2006.01); B32B 17/06 (2006.01); C03C 21/00 (2006.01); C03C 3/083 (2006.01)
CPC C03C 21/002 (2013.01) [C03C 3/083 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A glass article, comprising:
a glass body having first and second opposing primary surfaces and a thickness defined between the primary surfaces, and
wherein the glass body comprises a compressive stress region that comprises:
a surface stress of greater than about 900 MPa (compressive);
a spike region having a first slope; and
a tail region having a second slope,
wherein the spike region and the tail region intersect at a knee region having a stress of greater than about 35 MPa (compressive), and wherein the stress at the knee region is defined as the point where the asymptotic extrapolation of the spike region and the tail region intersect,
wherein the first slope of the spike region is steeper than about −50 MPa/μm,
wherein the glass body comprises a tension at a center of the glass body (CT) according to formula (I):
CT<(E/68 GPa)*75 MPa*1 mm0.5/(Th)0.5  (I),
wherein E is the Young's modulus of the glass body, measured in GPa, and Th is the thickness of the glass body, measured in millimeters, and
wherein the compressive stress region comprises a depth of compression where the stress inside the glass body is 0 of greater than about 0.16*(Th).