US 11,884,581 B2
Scratch resistant glass and method of making
Jaymin Amin, Corning, NY (US); Xiaoju Guo, Pittsford, NY (US); Pascale Oram, Hammondsport, NY (US); Rostislav Vatchev Roussev, Painted Post, NY (US); Ljerka Ukrainczyk, Ithaca, 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. 24, 2022, as Appl. No. 17/894,693.
Application 17/894,693 is a division of application No. 16/826,473, filed on Mar. 23, 2020, granted, now 11,472,733.
Claims priority of provisional application 62/826,300, filed on Mar. 29, 2019.
Prior Publication US 2022/0411324 A1, Dec. 29, 2022
Int. Cl. C03C 21/00 (2006.01); C03C 3/093 (2006.01); C03C 3/12 (2006.01); C03C 4/18 (2006.01); H05K 5/00 (2006.01); H05K 5/03 (2006.01)
CPC C03C 21/002 (2013.01) [C03C 3/093 (2013.01); C03C 3/125 (2013.01); C03C 4/18 (2013.01); H05K 5/0017 (2013.01); H05K 5/03 (2013.01); C03C 2204/00 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A method of manufacturing a glass-based article, comprising:
exposing a glass-based substrate having opposing first and second surfaces defining a substrate thickness (t) and having a lithium aluminosilicate composition to an ion exchange treatment comprising a first molten salt bath having a concentration of a sodium salt in a range from 8 mol % to 100 mol % to form the glass-based article,
wherein the glass-based article comprises:
sodium having a non-zero varying concentration extending from a surface of the glass-based article to a depth of the glass-based article;
a compressive layer extending from the surface to a spike depth of layer (DOLspike) from 4 micrometers to 8 micrometers; and
a molar ratio of potassium oxide (K2O) to sodium oxide (Na2O) averaged over a distance from the surface to a depth of the glass-based article of 0.4 micrometers that is from 0 to 1.8; and
wherein at least one of the following is satisfied:
a base composition of the glass-based substrate comprises a molar ratio of sodium oxide (Na2O) to lithium oxide (Li2O) of less than or equal to 0.63; and
at a center of the glass-based article, a molar ratio of sodium oxide (Na2O) to lithium oxide (Li2O) is less than or equal to 0.63.