Ion-exchangeable mixed alkali aluminosilicate glasses
A glass composition includes from 55.0 mol % to 75.0 mol % SiO 2 ; from 8.0 mol % to 20.0 mol % Al 2 O 3 ; from 3.0 mol % to 15.0 mol % Li 2 O; from 5.0 mol % to 15.0 mol % Na 2 O; and less than or equal to 1.5 mol % K 2 O. The glass composition has the following relationships: Al 2 O 3 +Li 2 O is greater than 22.5 mol %, R 2 O+RO is greater than or equal to 18.0 mol %, R 2 O/Al 2 O 3 is greater than or equal to 1.06, SiO 2 +Al 2 O 3 +B 2 O 3 +P 2 O 5 is greater than or equal to 78.0 mol %, and (SiO 2 +Al 2 O 3 +B 2 O 3 +P 2 O 5 )/Li 2 O is greater than or equal to 8.0. The glass composition may be used in a glass article or a consumer electronic product.
1. A glass composition comprising:
from 55.0 mol % to 73.5 mol % SiO 2 ;
from 8.0 mol % to 20.0 mol % Al 2 O 3 ;
from 0.5 mol % to 8.0 mol % P 2 O 5 ;
from 6.0 mol % to 10.0 mol % Li 2 O;
from 5.0 mol % to 15.0 mol % Na 2 O; and
less than or equal to 1.5 mol % K 2 O,
wherein:
Al 2 O 3 +Li 2 O+Na 2 O is greater than or equal to 27.5 mol %,
R 2 O+RO is from greater than or equal to 18.0 mol % to less than or equal to 22.0 mol %, where R 2 O is alkali oxides present in the glass composition and RO is divalent cation oxides present in the glass composition,
R 2 O/Al 2 O 3 is greater than or equal to 1.06,
SiO 2 +Al 2 O 3 +B 2 O 3 +P 2 O 5 is from greater than or equal to 78.0 mol % to less than or equal to 82.0 mol %, and
(SiO 2 +Al 2 O 3 +B 2 O 3 +P 2 O 5 )/Li 2 O is from greater than or equal to 8.0 to less than or equal to 13.0.
2. The glass composition of claim 1 , wherein P 2 O 5 is from 1.0 mol % to 8.0 mol %.
3. The glass composition of claim 1 , wherein the glass composition comprises:
from greater than or equal to 7.0 mol % to less than or equal to 10.0 mol % Li 2 O; and
from greater than or equal to 5.0 mol % to less than or equal to 9.0 mol % Na 2 O.
4. The glass composition of claim 1 , wherein Al 2 O 3 +Li 2 O+Na 2 O is greater than or equal to 31.75 mol %.
5. The glass composition of claim 1 , wherein Al 2 O 3 +Li 2 O+Na 2 O is greater than or equal to 33.5 mol %.
6. The glass composition of claim 1 , wherein Al 2 O 3 +Li 2 O+Na 2 O is greater than or equal to 34.4 mol %.
7. The glass composition of claim 2 , wherein Al 2 O 3 +Li 2 O is greater than 22.5 mol %.
8. The glass composition of claim 1 , wherein R 2 O+RO is from 18.0 mol % to 21.5 mol %.
9. The glass composition of claim 1 , wherein SiO 2 +Al 2 O 3 +B 2 O 3 +P 2 O 5 is from 78.0 mol % to 81.5 mol %.
10. The glass composition of claim 1 , wherein B 2 O 3 +P 2 O 5 is greater than or equal to 1.5 mol %.
11. The glass composition of claim 1 , wherein R 2 O/Al 2 O 3 is greater than or equal to 1.10.
12. The glass composition of claim 1 , wherein R 2 O/Al 2 O 3 is from 1.06 to 2.10.
13. The glass composition of claim 1 , wherein R 2 O/Al 2 O 3 is from 1.10 to 1.90.
14. A glass article comprising:
a first surface;
a second surface opposite the first surface, wherein a thickness (t) of the glass article is measured as a distance between the first surface and the second surface; and
a compressive stress layer extending from at least one of the first surface and the second surface into the thickness (t) of the glass article,
wherein:
a central tension of the glass article is greater than or equal to 30 MPa,
the compressive stress layer has a depth of compression that is from 0.15 t to 0.25 t, and
the glass article is formed from a glass comprising the glass composition of claim 1 .
15. The glass article of claim 14 , wherein the central tension of the glass article is greater than or equal to 50 MPa.
16. The glass article of claim 14 , wherein a potassium depth of layer of the compressive stress layer into the thickness of the glass article is from greater than 5 μm to 45 μm.
17. The glass article of claim 14 , wherein the glass has a liquidus viscosity from 20 kP to 1000 kP.
18. The glass article of claim 14 , wherein a surface compressive stress of the compressive stress layer is from 450 MPa to 800 MPa.
19. A consumer electronic product, comprising:
a housing comprising a front surface, a back surface and side surfaces;
electrical components at least partially within the housing, the electrical components comprising at least a controller, a memory, and a display, the display at or adjacent the front surface of the housing; and
a cover substrate disposed over the display,
wherein at least a portion of at least one of the housing and the cover substrate comprises the glass article of claim 14 .