US 12,330,980 B2
Glass and glass ceramic composite and method
Indrajit Dutta, Horseheads, NY (US); and Nicholas James Smith, Port Matilda, PA (US)
Assigned to CORNING INCORPORATED, Corning, NY (US)
Appl. No. 17/297,034
Filed by CORNING INCORPORATED, Corning, NY (US)
PCT Filed Nov. 25, 2019, PCT No. PCT/US2019/063015
§ 371(c)(1), (2) Date May 26, 2021,
PCT Pub. No. WO2020/112639, PCT Pub. Date Jun. 4, 2020.
Claims priority of provisional application 62/773,447, filed on Nov. 30, 2018.
Prior Publication US 2021/0395137 A1, Dec. 23, 2021
Int. Cl. C03C 10/00 (2006.01); C03C 3/062 (2006.01); C03C 23/00 (2006.01)
CPC C03C 10/0009 (2013.01) [C03C 3/062 (2013.01); C03C 23/008 (2013.01); C03C 23/009 (2013.01); C03C 2203/52 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A glass glass-ceramic composite comprising:
a substrate comprising: an alkali containing glass bulk, the glass bulk comprising material comprising: Al2O3 and SiO2 and alkali, and
a glass-ceramic surface layer integral to the glass substrate produced from the alkali containing glass bulk material of the substrate, by reducing the concentration of alkali in the surface layer of the substrate,
the surface layer of the substrate comprising an alkali-depleted glass ceramic comprising Al2O3 and SiO2 with at least 5% crystalline phase by volume, wherein the alkali-depleted glass ceramic surface layer comprises a mol % Al2O3 of at least 51%.