Glass-based articles including a metal oxide concentration gradient
AssigneeCorning Incorporated
InventorsRostislav Vatchev Roussev, Charlene Marie Smith
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Abstract
Methods of forming a chemically strengthened glass-based article include ion exchanging a plurality of alkali ions into a glass-based substrate to form a glass-based article with a non-zero alkali metal oxide concentration that varies along at least a substantial portion of a thickness of the glass-based substrate. The ion-exchanging includes immersing the glass-based substrate in a molten salt bath for from 50% to 130% of an ion exchange time that produces a peak central tension (CT) with the same molten salt bath composition and temperature. The molten salt bath includes at least 90% by weight of a potassium salt and 10% or less by weight of a sodium salt.
Claims20
A method of forming a chemically strengthened glass-based article, the method comprising:
- ion exchanging a plurality of alkali ions into a glass-based substrate to form a glass-based article with a non-zero alkali metal oxide concentration that varies along at least a substantial portion of a thickness (t) of the glass-based substrate,
- wherein the ion exchanging comprises immersing the glass-based substrate in a molten salt bath for from 50% to 130% of an ion exchange time that produces a peak central tension (CT) with the same molten salt bath composition and temperature, wherein the molten salt bath comprises:
- at least 90% by weight of a potassium salt;
- and
- 10% or less by weight of a sodium salt,
- wherein the glass-based substrate comprises a first surface and a second surface opposing the first surface defining the thickness (t).
Dependencies are inferred from the claim text.