Chemically strengthened glass, and method for manufacturing the same
AssigneeAGC Inc.
InventorsKaname SEKIYA, Yusuke FUJIWARA
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Abstract
The present invention relates to a chemically strengthened glass having a thickness of t [mm], and having a profile of a stress value CSx [MPa] at a depth x [μm] from a surface of the glass, the stress value being measured by a scattered-light photoelastic stress meter, in which a second-order differential value CSx″ of the stress value CSx in the profile satisfies the following expression within a range of CSx≥0: 0<CSx″≤0.050.
Claims20
A chemically strengthened glass having a thickness of t [mm], and having a profile of a stress value CSx [MPa] at a depth x [μm] from a surface of the glass, the stress value being measured by a scattered-light photoelastic stress meter,
- wherein a second-order differential value CSx″ of the stress value CSx in the profile satisfies the following expression within a range of CSx≥0:
- 0<CSx″≤0.050.
A method of manufacturing a chemically strengthened glass, the method comprising:
- immersing a lithium-containing glass into a first molten salt composition comprising sodium ions and potassium ions to thereby perform first ion exchange;
- and
- immersing the lithium-containing glass into a second molten salt composition comprising potassium ions to thereby perform second ion exchange,
- wherein in the first molten salt composition, a concentration of potassium nitrate is higher than a concentration of sodium nitrate, and
- in the second molten salt composition, a concentration of potassium nitrate is 85 mass % or higher, and a mass ratio of sodium ions to lithium ions is 0 or higher and 15 or lower.
Dependencies are inferred from the claim text.