US 11,787,728 B2
Scratch resistant glass and method of making
Yuhui Jin, Painted Post, NY (US); Joshua James McCaslin, Beaver Dams, NY (US); Vitor Marino Schneider, Painted Post, NY (US); Wei Sun, Painted Post, NY (US); and Taylor Marie Wilkinson, Painted Post, NY (US)
Assigned to CORNING INCORPORATED, Corning, NY (US)
Filed by CORNING INCORPORATED, Corning, NY (US)
Filed on Aug. 28, 2020, as Appl. No. 17/5,769.
Claims priority of provisional application 62/937,955, filed on Nov. 20, 2019.
Claims priority of provisional application 62/894,288, filed on Aug. 30, 2019.
Prior Publication US 2021/0061705 A1, Mar. 4, 2021
Int. Cl. B32B 15/04 (2006.01); B32B 17/06 (2006.01); C03C 3/093 (2006.01); C03C 21/00 (2006.01); C03C 4/18 (2006.01); C03C 3/091 (2006.01)
CPC C03C 3/093 (2013.01) [C03C 3/091 (2013.01); C03C 4/18 (2013.01); C03C 21/002 (2013.01); C03C 2204/00 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A glass-based article comprising:
a lithium aluminosilicate composition;
a molar ratio of sodium oxide (Na2O) to lithium oxide (Li2O) that is less than or equal to 0.9 at the center of the glass-based article;
a thickness t; and
a stress profile comprising:
a spike region extending from the first surface to a knee at a spike depth of layer (DOLspike); and
a tail region extending from the knee to a center of the glass-based article, wherein within the tail region there is a post-spike near region;
wherein a molar ratio of sodium dioxide (Na2O) to lithium dioxide (Li2O) in the post-spike near region is greater than or equal to 0.9.