US 11,927,722 B2
Glass-ceramic articles having specified elastic modulus and fracture toughness
Jaymin Amin, Corning, NY (US); Jason Thomas Harris, Horseheads, NY (US); Shandon Dee Hart, Elmira, NY (US); Chang-gyu Kim, Suwon-si (KR); Karl William Koch, III, Elmira, NY (US); Carlo Anthony Kosik Williams, Painted Post, NY (US); Lin Lin, Painted Post, NY (US); Dong-gun Moon, Yongin-si (KR); Jeonghong Oh, Cheonan-si (KR); James Joseph Price, Corning, NY (US); Charlene Marie Smith, Corning, NY (US); Ananthanarayanan Subramanian, Corning, NY (US); Ljerka Ukrainczyk, Ithaca, NY (US); and Tingge Xu, Santa Clara, CA (US)
Assigned to Corning Incorporated, Corning, NY (US)
Filed by CORNING INCORPORATED, Corning, NY (US)
Filed on Mar. 13, 2023, as Appl. No. 18/120,488.
Application 18/120,488 is a continuation of application No. 17/708,105, filed on Mar. 30, 2022.
Claims priority of provisional application 63/282,720, filed on Nov. 24, 2021.
Claims priority of provisional application 63/169,376, filed on Apr. 1, 2021.
Prior Publication US 2023/0244004 A1, Aug. 3, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 1/115 (2015.01); G02B 1/14 (2015.01); G02B 5/28 (2006.01)
CPC G02B 1/14 (2015.01) [G02B 1/115 (2013.01); G02B 5/285 (2013.01); C03C 2217/734 (2013.01)] 28 Claims
OG exemplary drawing
 
1. An article, comprising:
a glass-ceramic substrate comprising a first primary surface and a second primary surface, the first primary surface and the second primary surface opposing one another; and
an optical film structure defining an outer surface, the optical film structure disposed on the first primary surface,
wherein the glass-ceramic substrate comprises an elastic modulus of greater than 85 GPa and a fracture toughness of greater than 0.8 MPa·√m,
wherein:
the article exhibits a maximum hardness of greater than 10 GPa, as measured by a Berkovich Hardness Test over an indentation depth range from about 100 nm to about 500 nm from the outer surface of the optical film structure,
the article exhibits an average photopic transmittance of greater than 80%,
the article exhibits a transmitted color √(a*2+b*2) with a D65 illuminant of less than 4 at incident angles from 0 degrees to 10 degrees.