Chemically strengthened glass and method for manufacturing chemically strengthened glass

16:

• The chemically strengthened glass according to claim 15, satisfying a number of fragments generated within a size of 25 mm×25 mm being 20 or less in a fracture test according to an indenter indentation test under a condition of holding a load ranging from 5 kgf to 10 kgf for 15 seconds with a pyramidal diamond indenter having an indenter angle of a facing angle of 60°.

17:

• The chemically strengthened glass according to claim 15, wherein the ΔCSDOL-20 (unit:
• MPa/μm) is 0.4 or more.

18:

• The chemically strengthened glass according to claim 15, wherein the ΔCSDOL-20 (unit:
• MPa/μm) is 1.6 or less.

19:

• The chemically strengthened glass according to claim 15, having a fracture stress value σa (bending strength, unit:
• MPa) being 150 MPa or more obtained by performing a four-point bending test under conditions of an under spun of 30 mm, an upper spun of 10 mm, and a crosshead speed of 0.5 mm/minute after the glass surface is flawed by pressing a diamond indenter (indenter angle of facing angle:
• 110°) thereto for 15 seconds at a load of 0.5 kgf.

20:

• The chemically strengthened glass according to claim 15, having a fracture stress value σc (bending strength, unit:
• MPa) being 150 MPa or more obtained by performing a four-point bending test under conditions of an under spun of 30 mm, an upper spun of 10 mm, and a crosshead speed of 0.5 mm/minute after the glass surface is flawed by pressing a diamond indenter (indenter angle of facing angle:
• 110°) thereto for 15 seconds at a load of 2 kgf.

21:

• The chemically strengthened glass according to claim 15, wherein the CS40 is 200 MPa or less.

22:

• The chemically strengthened glass according to claim 15, having a compressive stress value (CS90) at a portion of 90 μm deep from the glass surface being 40 MPa or more.

23:

• The chemically strengthened glass according to claim 22, wherein the CS90 is 75 MPa or less.

25:

• The chemically strengthened glass according to claim 24, wherein the ΔCS100-90 (unit:
• MPa/μm) is 4.0 or less.

26:

• The chemically strengthened glass according to claim 25, wherein the ΔCS100-90 (unit:
• MPa/μm) is 1.6 or less.

27:

• The chemically strengthened glass according to claim 15, wherein the surface compressive stress value is 1500 MPa or less.

28:

• The chemically strengthened glass according to claim 15, having a depth of a compressive stress layer (DOL) being 120 μm or more and 180 μm or less.

29:

• The chemically strengthened glass according to claim 15, wherein the matric composition comprises, in terms of molar percentage on the basis of oxides, from 60 to 72% of SiO2, from 7 to 18% of Al2O3, from 0 to 3% of B2O3, from 0 to 3% of P2O5, from 6 to 13% of Li2O, from 3 to 10% of Na2O, from 0 to 2% of K2O, from 0 to 10% of MgO, from 0 to 0.2% of CaO, from 0 to 3% of SrO, from 0 to 3% of BaO, from 0 to 2% of ZnO, and from 0 to 2% of ZrO2.

30:

• The chemically strengthened glass according to claim 29, wherein MgO is contained.

31:

• The chemically strengthened glass according to claim 29, wherein the matrix composition comprises 0.5% or more of K2O.

32:

• The chemically strengthened glass according to claim 29, wherein the content of Li2O is 10% or less.

33:

• The chemically strengthened glass according to claim 29, wherein P2O5 is contained.

34:

• The chemically strengthened glass according to claim 29, wherein the matrix composition comprises 0.5% or more of ZrO2.