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US 11,453,610 B2Granted
Lithium containing glass or glass ceramic article with modified K2O profile near the glass surface
AssigneeCorning Incorporated
InventorsRyan Claude Andrews, Jill Marie Hall, Pascale Oram, Rostislav Vatchev Roussev, Vitor Marino Schneider, Ljerka Ukrainczyk
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Abstract
A method of reworking lithium containing ion exchanged glass articles is provided. The method includes a reverse ion exchange process that returns the glass article to approximately the composition of the glass from which the glass article was produced, before being subjected to ion exchange. The reworked glass articles exhibit a K2O concentration profile comprising a portion wherein a K2O concentration increases to a local K2O concentration maximum.
Claims7
An alkali aluminosilicate glass article comprising:
- Li2O, Na2O, and K2O;
- a compressive stress layer extending from a surface of the alkali aluminosilicate glass to a depth of compression (DOC);
- a tensile region extending from the depth of layer into the glass article and having a maximum tensile stress of at least about 40 MPa;
- a potassium depth of layer (DOL), wherein the potassium DOL is less than the DOC;
- and
- a K2O concentration at a depth of about 15 μm to about 25 μm that is at least about 0.3 mol % higher than a K2O concentration at a center of the alkali aluminosilicate glass article.
3 more elements
Dependencies are inferred from the claim text.