Chemically strengthened glass
A chemically strengthened glass obtained by chemically strengthening a lithium-containing aluminosilicate glass, when representing a sheet thickness of the chemically strengthened glass by t (μm) and an internal stress at a depth x (μm) from a surface of the chemically strengthened glass by σ(x) (MPa), has a value of a ratio C=rE/rE limit being greater than or equal to 0.7 and less than 1.0 where rE (kJ/m 2 ) is calculated from Expression (3) described above and rE limit =16×t/1000+3.
1. A chemically strengthened glass obtained by chemically strengthening a lithium-containing aluminosilicate glass, wherein representing a sheet thickness of the chemically strengthened glass by t (μm) and an internal stress at a depth x (μm) from a surface of the chemically strengthened glass by σ(x) (MPa), the chemically strengthened glass has a value of a ratio C=rE/rE limit being greater than or equal to 0.7 and less than 1.0 where rE (kJ/m 2 ) is calculated from a following Expression (3) and rE limit =16×t/1000+3, wherein rE limit is expressed in kJ/m 2
rE
=
2
×
∫
DOL
t
/
2
|
σ
(
x
)
|
dx
×
(
t
-
2
×
DOL
)
1000
×
t
(
3
)
where DOL represents a depth (μm) of a compressive stress layer of the chemically strengthened glass, wherein DOL representing the depth of the compressive stress layer is greater than or equal to 85 μm, wherein a position at which a half value (HW) of a surface compressive stress CS is less than 8 μm.
2. The chemically strengthened glass as claimed in claim 1 , wherein the surface compressive stress CS is greater than or equal to 600 MPa.
3. The chemically strengthened glass as claimed in claim 1 , wherein DOL representing the depth of the compressive stress layer is greater than or equal to 90 μm.
4. The chemically strengthened glass as claimed in claim 1 , wherein DOL representing the depth of the compressive stress layer is greater than or equal to 95 μm.
5. The chemically strengthened glass as claimed in claim 1 , wherein the sheet thickness t is less than or equal to 1500 μm.
6. The chemically strengthened glass as claimed in claim 2 , wherein the sheet thickness t is less than or equal to 1500 μm.
7. The chemically strengthened glass as claimed in claim 3 , wherein the sheet thickness t is less than or equal to 1500 μm.
8. The chemically strengthened glass as claimed in claim 4 , wherein the sheet thickness t is less than or equal to 1500 μm.
9. The chemically strengthened glass as claimed in claim 1 , wherein DOL representing the depth of the compressive stress layer is greater than or equal to 100 μm.
10. The chemically strengthened glass as claimed in claim 1 , wherein the chemically strengthened glass has a value of a ratio C=rE/rE limit being greater than or equal to 0.84 and less than 1.0.
11. The chemically strengthened glass as claimed in claim 1 , wherein the chemically strengthened glass has a value of a ratio C=rE/rE limit being greater than or equal to 0.87 and less than 1.0.
12. The chemically strengthened glass as claimed in claim 1 , wherein the chemically strengthened glass has a value of a ratio C=rE/rE limit being greater than or equal to 0.90 and less than 1.0.
13. The chemically strengthened glass as claimed in claim 1 , wherein a position at which a half value (HW) of a surface compressive stress CS is less than or equal to 6 μm.
14. The chemically strengthened glass as claimed in claim 1 , wherein a position at which a half value (HW) of a surface compressive stress CS is less than or equal to 5 μm.
15. A chemically strengthened glass obtained by chemically strengthening a lithium-containing aluminosilicate glass, wherein representing a sheet thickness of the chemically strengthened glass by t (μm) and an internal stress at a depth x (μm) from a surface of the chemically strengthened glass by σ(x) (MPa), the chemically strengthened glass has a value of a ratio C=rE/rE limit being greater than or equal to 0.7 and less than 1.0 where rE (kJ/m 2 ) is calculated from a following Expression (3) and rE limit =16×t/1000+3, wherein rE limit is expressed in kJ/m 2 , and a stress value at a half depth of a DOL value of the glass is 10% or less, with respect to a surface stress value,
r
E
=
2
×
∫
DOL
t
/
2
σ
(
x
)
dx
×
(
t
-
2
×
DOL
)
1000
×
t
(
3
)
where DOL represents a depth (μm) of a compressive stress layer of the chemically strengthened glass, wherein DOL representing the depth of the compressive stress layer is greater than or equal to 85 μm, wherein a position at which a half value (HW) of a surface compressive stress CS is less than 8 μm.
16. The chemically strengthened glass as claimed in claim 15 , wherein the surface compressive stress CS is greater than or equal to 600 MPa.
17. The chemically strengthened glass as claimed in claim 15 , wherein DOL representing the depth of the compressive stress layer is greater than or equal to 90 μm.
18. The chemically strengthened glass as claimed in claim 15 , wherein DOL representing the depth of the compressive stress layer is greater than or equal to 95 μm.
19. The chemically strengthened glass as claimed in claim 15 , wherein the sheet thickness t is less than or equal to 1500 μm.
20. The chemically strengthened glass as claimed in claim 15 , wherein DOL representing the depth of the compressive stress layer is greater than or equal to 100 μm.