Methods for treating glass articles
AssigneeCorning Incorporated
InventorsKeith Raymond Gaylo, Lewis Kirk Klingensmith, Robert Anthony Schaut, Steven Alvin Tietje
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Abstract
Methods for increasing the hydrolytic resistance of a glass article are disclosed. According to one embodiment, the method includes providing a glass article with a pre-treatment hydrolytic titration value. Thereafter, the glass article is thermally treated at a treatment temperature greater than a temperature 200 C less than a strain temperature of the glass article for a treatment time greater than or equal to about 0.25 hours such that, after thermally treating the glass article, the glass article has a post-treatment hydrolytic titration value that is less than the pre-treatment hydrolytic titration value.
Claims17
A method for increasing the hydrolytic resistance of a glass article, the method comprising:
- providing a glass article with a pre-treatment hydrolytic titration value and comprising a glass surface layer having inorganic deposits;
- and
- thermally treating the glass article at a treatment temperature at least 20° C. greater than the annealing temperature of the glass article and less than a softening point of the glass article for a treatment time greater than or equal to about 0.25 hours such that species forming the inorganic deposits of the glass surface layer diffuse into the glass and, after thermally treating the glass article, the glass article has a post-treatment hydrolytic titration value that is less than the pre-treatment hydrolytic titration value.
A method for increasing the hydrolytic resistance of a glass article, the method comprising:
- providing a glass article with at least one surface having a glass surface layer with a composition that is different than a composition at a midpoint of a thickness of the glass article, the at least one surface having a pre-treatment hydrolytic titration value;
- and
- diffusing species from the glass surface layer into the thickness of the glass article to homogenize the surface glass layer relative to the midpoint of the thickness of the glass article such that, after diffusing, the at least one surface of the glass article has a post-treatment hydrolytic titration value which is less than the pre-treatment hydrolytic titration value, wherein diffusing species within the surface glass layer comprises thermally treating the glass article at a temperature at least 20° C. greater than an annealing temperature of the glass article and less than a softening point of the glass article.
The method of 14, wherein after diffusing the species an extrema in the layer concentration of each constituent component in the glass surface layer is greater than or equal to 92% or less than or equal to about 108% of a concentration of the same constituent component at the midpoint.
Dependencies are inferred from the claim text.