Chemically tempered glass and manufacturing method of chemically tempered glass

摘要

To provide a chemically reinforced glass excellent in sharp angle article scratching strength, high in safety at breaking and high in ion exchange rate.SOLUTION: There is provided a chemically reinforced glass having thickness t of 2 mm or less, a compression stress value at a part with depth of 40 μm from a surface (CS) of 60 MPa or more, a surface compression stress value (CS) of 450 MPa or more, ΔCS(unit:MPa/μm) calculated by the following formula using a compression stress value at depth of 20 μm surface side from DOL of 4.0 or less, and having a base composition containing, by mol%, SiOof 58 to 72%, AlOof 7 to 20%, LiO of 3 to 15%, NaO of 0 to 10%, KO of 0 to 8%, MgO of 0 to 10%, CaO of 0 to 3%, SrO of 0 to 3%, BaO of 0 to 3%, ZnO of 0 to 10%, ZrOof 0 to 4%. ΔCS=CS/20.SELECTED DRAWING: None