US 11,691,913 B2
Glass-based articles including a metal oxide concentration gradient
Matthew John Dejneka, Corning, NY (US); Sinue Gomez, Corning, NY (US); Guangli Hu, Berkeley Heights, NJ (US); Charlene Marie Smith, Corning, NY (US); Zhongzhi Tang, Shenzhen (CN); and Steven Alvin Tietje, Lindley, NY (US)
Assigned to Corning Incorporated, Corning, NY (US)
Filed by CORNING INCORPORATED, Corning, NY (US)
Filed on Mar. 16, 2022, as Appl. No. 17/695,948.
Application 17/695,948 is a division of application No. 16/797,638, filed on Feb. 21, 2020, granted, now 11,279,652.
Application 16/797,638 is a division of application No. 16/027,741, filed on Jul. 5, 2018, granted, now 10,570,059, issued on Feb. 25, 2020.
Application 16/027,741 is a division of application No. 15/482,213, filed on Apr. 7, 2017, granted, now 10,017,417, issued on Jul. 10, 2018.
Claims priority of provisional application 62/366,338, filed on Jul. 25, 2016.
Claims priority of provisional application 62/320,077, filed on Apr. 8, 2016.
Prior Publication US 2022/0212985 A1, Jul. 7, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. B32B 3/00 (2006.01); C03C 21/00 (2006.01); C03C 3/091 (2006.01); C03C 3/093 (2006.01); C03C 3/097 (2006.01); C03C 10/00 (2006.01); H05K 5/00 (2006.01); H05K 5/03 (2006.01)
CPC C03C 21/002 (2013.01) [C03C 3/091 (2013.01); C03C 3/093 (2013.01); C03C 3/097 (2013.01); C03C 10/0027 (2013.01); H05K 5/0017 (2013.01); H05K 5/03 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A glass-based article comprising:
a first surface and a second surface opposing the first surface defining a thickness (t); and
a concentration of a metal oxide that is both non-zero and varies along a thickness range from 0·t to 0.3·t;
a stress profile comprising a compressive stress (CS) region and a central tension (CT) region, the CS region extending from the first surface to a depth of compression (DOC); and
a surface compressive stress of 500 MPa or greater; wherein the DOC is greater than or equal to 0.16·t; and
the CT region has a maximum CT in the range from 71.5√(t) to 100/√(t), wherein the CT region is approximated by the equation Stress(x)=maximum CT−(((CTn·(n+1))/0.5n)·|(x/t)−0.5|n), wherein maximum CT is a maximum tension value, CTn is less than or equal to maximum CT and is a positive value in units of MPa, x is position along the thickness (t) in micrometers, and n is between 1.5 and 3.