Corning Incorporated
SCRATCH RESISTANT GLASS AND METHOD OF MAKING

Abstract:

Glass-based articles comprise stress profiles providing improved scratch resistance. A glass-based article comprises a lithium aluminosilicate composition and a molar ratio of potassium dioxide (K.sub.2O) to sodium dioxide (Na.sub.2O) averaged over a distance from the surface to a depth of 0.4 micrometers that is greater than or equal to 0 and less than or equal to 1.8. The 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 and a spike depth of layer that is greater than or equal to 4 micrometers and less than or equal to 8 micrometers. The article may comprise an average compressive stress of greater than or equal to 150 MPa over a depth from 15 micrometers to 40 micrometers.