Ion-exchangeable mixed alkali aluminosilicate glasses

1. A glass composition comprising:

from greater than or equal to 55.0 mol % to less than or equal to 75.0 mol % SiO 2 ;

from greater than or equal to 12.5 mol % to less than or equal to 20.0 mol % Al 2 O 3 ;

from greater than or equal to 3.0 mol % to less than or equal to 10.0 mol % Li 2 O;

from greater than or equal to 5.0 mol % to less than or equal to 15.0 mol % Na 2 O;

less than or equal to 1.5 mol % K 2 O; and

from greater than 0.0 mol % to less than or equal to 8.0 mol % P 2 O 5 ,

wherein:

Al 2 O 3 +Li 2 O is greater than 22.5 mol %,

Al 2 O 3 +Li 2 O+Na 2 O is greater than or equal to 34.0 mol %,

R 2 O+RO is greater than or equal to 18.0 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 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.

2. The glass composition of claim 1 , wherein Al 2 O 3 +Li 2 O is greater than or equal to 23.0 mol %.

3. The glass composition of claim 1 , wherein Al 2 O 3 +Li 2 O is from greater than or equal to 23.0 mol % to less than or equal to 26.5 mol %.

4. The glass composition of claim 1 , wherein R 2 O+RO is from greater than or equal to 19.0 mol % to less than or equal to 22.0 mol %.

5. The glass composition of claim 1 , wherein R 2 O/Al 2 O 3 is from greater than or equal to 1.06 to less than or equal to 2.10.

6. The glass composition of claim 1 , wherein R 2 O/Al 2 O 3 is from greater than or equal to 1.10 to less than or equal to 1.90.

7. The glass composition of claim 1 , wherein 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 %.

8. The glass composition of claim 1 , wherein SiO 2 +Al 2 O 3 +B 2 O 3 +P 2 O 5 is from greater than or equal to 80.0 mol % to less than or equal to 82.0 mol %.

9. The glass composition of claim 1 , wherein (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 17.0.

10. The glass composition of claim 1 , wherein (SiO 2 +Al 2 O 3 +B 2 O 3 +P 2 O 5 )/Li 2 O is from greater than or equal to 10.0 to less than or equal to 15.0.

11. The glass composition of claim 1 , wherein B 2 O 3 +P 2 O 5 is greater than 0.0 mol %.

12. A glass composition comprising:

from greater than or equal to 55.0 mol % to less than or equal to 70.0 mol % SiO 2 ;

from greater than or equal to 15.0 mol % to less than or equal to 20.0 mol % Al 2 O 3 ;

from greater than or equal to 4.0 mol % to less than or equal to 9.0 mol % Li 2 O;

from greater than or equal to 5.0 mol % to less than or equal to 15.0 mol % Na 2 O;

less than or equal to 1.5 mol % K 2 O; and

from greater than 0.0 mol % to less than or equal to 8.0 mol % P 2 O 5 ,

wherein:

Al 2 O 3 +Li 2 O is greater than or equal to 24.0 mol %,

Al 2 O 3 +Li 2 O+Na 2 O is greater than or equal to 34.0 mol %,

R 2 O+RO is greater than or equal to 18.0 mol %, where R 2 O is alkali oxides present in the glass composition and RO is divalent cation oxides present in the glass composition,

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 9.0.

13. 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 greater than or equal to 0.15t to less than or equal to 0.25t, and

the glass article is formed from a glass according to claim 12 .

14. The glass article of claim 13 , wherein the central tension of the glass article is greater than or equal to 50 MPa.

15. The glass article of claim 13 , wherein the central tension of the glass article is greater than or equal to 80 MPa.

16. The glass article of claim 13 , 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 less than or equal to 45 μm.

17. The glass article of claim 13 , wherein the glass has a liquidus viscosity from greater than or equal to 20 kP to less than 1000 kP.

18. The glass article of claim 13 , wherein a surface compressive stress of the compressive stress layer is greater than or equal to 450 MPa to less than or equal 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 13 .

20. 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 greater than or equal to 0.15t to less than or equal to 0.25t, and

the glass article is formed from a glass comprising:

from greater than or equal to 55.0 mol % to less than or equal to 75.0 mol % SiO 2 ;

from greater than or equal to 12.5 mol % to less than or equal to 20.0 mol % Al 2 O 3 ;

from greater than or equal to 3.0 mol % to less than or equal to 10.0 mol % Li 2 O;

from greater than or equal to 5.0 mol % to less than or equal to 15.0 mol % Na 2 O;

less than or equal to 1.5 mol % K 2 O; and

from greater than 0.0 mol % to less than or equal to 8.0 mol % P 2 O 5 ,

wherein:

Al 2 O 3 +Li 2 O is greater than 22.5 mol %,

Al 2 O 3 +Li 2 O+Na 2 O is greater than or equal to 34.0 mol %,

R 2 O+RO is greater than or equal to 18.0 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 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.

21. The glass article of claim 20 , wherein the central tension of the glass article is greater than or equal to 50 MPa.

22. The glass article of claim 20 , wherein the central tension of the glass article is greater than or equal to 80 MPa.

23. The glass article of claim 20 , 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 less than or equal to 45 μm.

24. The glass article of claim 20 , wherein the glass has a liquidus viscosity from greater than or equal to 20 kP to less than 1000 kP.

25. The glass article of claim 20 , wherein a surface compressive stress of the compressive stress layer is greater than or equal to 450 MPa to less than or equal to 800 MPa.

26. 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 20 .

27. 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 60 MPa,

the compressive stress layer has a depth of compression that is from greater than or equal to 0.15t to less than or equal to 0.25t, and

the glass article has a composition at a center depth of the glass article comprising:

from greater than or equal to 55.0 mol % to less than or equal to 75.0 mol % SiO 2 ;

from greater than or equal to 12.5 mol % to less than or equal to 20.0 mol % Al 2 O 3 ;

from greater than or equal to 3.0 mol % to less than or equal to 10.0 mol % Li 2 O;

from greater than or equal to 5.0 mol % to less than or equal to 15.0 mol % Na 2 O;

less than or equal to 1.5 mol % K 2 O; and

from greater than 0.0 mol % to less than or equal to 8.0 mol % P 2 O 5 ,

wherein:

Al 2 O 3 +Li 2 O is greater than 22.5 mol %,

Al 2 O 3 +Li 2 O+Na 2 O is greater than or equal to 34.0 mol %,

R 2 O+RO is greater than or equal to 18.0 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 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.