Glass-based articles having crack resistant stress profiles
Glass-based articles are disclosed having a thickness in a range of from about 0.2 mm to about 4.0 mm, a first compressive stress layer extending from a first surface of the glass-based article to a first depth of compression that is in a range of from about 5% to about 20% of the thickness, a second compressive stress layer extending from a second surface of the glass-based article to a second depth of compression that is in a range of from about 5% to about 20% of the thickness, wherein the second surface is opposite the first surface, and a central region extending from the first depth of compression to the second depth of compression and having a maximum tensile stress in a range of from about 0.5 MPa to about 20 MPa. Electronic devices comprising the glass-based articles and methods of making glass-based articles are also disclosed.
1. A glass-based article, comprising:
a thickness in a range of from greater than 500 microns to less than or equal to 2.0 mm;
a compressive stress layer extending from a surface of the glass-based article to a depth of compression (DOC) in range of from greater than or equal to 13% to less than or equal to 20% of the thickness;
a spike extending from the surface of the glass-based article to a spike depth (DOLsp) that is less than the DOC; and
a central region having a maximum tensile stress in a range of greater than or equal to 0.5 MPa to less than or equal to 20 MPa,
wherein there is a compressive stress at the surface of the glass-based article of greater than or equal to 300 MPa, and
wherein the glass-based article is formed of a glass composition comprising from greater than 0 mol % to less than or equal to 20 mol % R 2 O, R 2 O being the total amount of alkali metal oxides in the composition.
2. The glass-based article of claim 1 , wherein the glass-based article is chemically strengthened.
3. The glass-based article of claim 1 , wherein the compressive stress is in a range from greater than or equal to 300 MPa to less than or equal to 800 MPa.
4. The glass-based article of claim 1 , wherein the depth of compression (DOC) is in a range of from greater than or equal to 15% to less than or equal to 20% of the thickness.
5. The glass-based article of claim 1 , wherein the glass composition is an alkali aluminosilicate glass.
6. The glass-based article of claim 1 , wherein the glass composition is a lithium aluminosilicate glass.
7. The glass-based article of claim 6 , wherein the lithium aluminosilicate glass comprises Li 2 O in a range from greater than 0 mol % to less than or equal to 20 mol %.
8. The glass-based article of claim 6 , wherein the lithium aluminosilicate glass comprises Li 2 O in a range from greater than 0 mol % to less than or equal to 15 mol %.
9. The glass-based article of claim 6 , wherein the lithium aluminosilicate glass is formed from a composition wherein R 2 O (mol %)/Al 2 O 3 (mol %)<2, where R 2 O═Li 2 O+Na 2 O.
10. The glass-based article of claim 1 , wherein the glass composition comprises:
from greater than or equal to 40 mol % to less than or equal to 80 mol % SiO 2 ;
from greater than or equal to 10 mol % to less than or equal to 30 mol % Al 2 O 3 ;
from greater than 0 mol % to less than or equal to 10 mol % B 2 O 3 ; and
from greater than 0 mol % to less than or equal to 15 mol % RO,
wherein RO is the total amount of alkaline earth metal oxides in the composition.
11. The glass-based article of claim 10 , wherein the glass composition comprises from greater than or equal to 14 mol % to less than or equal to 18 mol % R 2 O.
12. The glass-based article of claim 10 , wherein the glass composition comprises from greater than 0 mol % to less than or equal to 6 mol % RO.
13. The glass-based article of claim 10 , wherein the glass composition comprises:
from greater than or equal to 50 mol % to less than or equal to 65 mol % SiO 2 ;
from greater than or equal to 15 mol % to less than or equal to 30 mol % Al 2 O 3 ;
from greater than or equal to 2 mol % to less than or equal to 8 mol % B 2 O 3 ;
from greater than or equal to 14 mol % to less than or equal to 18 mol % R 2 O; and
from greater than 0 mol % to less than or equal to 6 mol % RO.
14. The glass-based article of claim 13 , wherein the glass composition comprises from greater than 0 mol % to less than or equal to 15 mol % Li 2 O.
15. The glass-based article of claim 1 , wherein the glass-based article comprises a 2.5 D shape.
16. The glass-based article of claim 1 , wherein the glass-based article comprises a 3D shape.
17. The glass-based article of claim 1 , wherein the thickness in a range of from greater than 500 microns to less than or equal to 800 microns.
18. The glass-based article of claim 1 , wherein:
the surface is a first surface of the glass-based article,
the compressive stress layer is a first compressive stress layer extending from the first surface,
the depth of compression (DOC) is a first depth of compression (DOC1);
the spike is a first spike extending from the first surface of the glass-based article,
the spike depth (DOLsp) a first spike depth (DOL1sp), and
the glass-based article further comprises:
a second compressive stress layer extending from a second surface of the glass-based article to a second depth of compression (DOC2), wherein the second surface is opposite the first surface; and
a second spike extending from the second surface of the glass-based article to a second spike depth (DOL2sp) that is less than DOC2.
19. A consumer electronic device, comprising:
a housing;
electrical components provided at least partially internal to the housing, the electrical components including at least a controller, a memory, and a display, the display being provided at or adjacent to a front surface of the housing; and
a cover article disposed at or over the front surface of the housing and over the display,
wherein at least a portion of one of the cover article and/or the housing comprises the glass-based article of claim 1 .
20. A method of making a glass-based article, the method comprising:
chemically strengthening a glass-based substrate having a thickness in a range of from greater than 500 microns to less than or equal to 2.0 mm to provide the glass-based article comprising:
a compressive stress layer extending from a surface of the glass-based article to a depth of compression (DOC) in range of from greater than or equal to 13% to less than or equal to 20% of the thickness,
a spike extending from the surface of the glass-based article to a spike depth (DOLsp) that is less than the DOC; and
continuing the strengthening until a central region of the glass-based article comprises a tensile stress in a range of from greater than or equal to 0.5 MPa to less than or equal to 20 MPa,
wherein there is a compressive stress at the surface of greater than or equal to 300 MPa, and
wherein the glass-based article is formed of a glass composition comprising from greater than 0 mol % to less than or equal to 20 mol % R 2 O, R 2 O being the total amount of alkali metal oxides in the composition.