Black lithium silicate glass ceramics

1. A glass ceramic, comprising:

at least one lithium silicate crystal phase as a primary crystal phase; and

at least one of petalite, β-quartz, β-spodumene, cristobalite, and lithium phosphate as a secondary crystal phase,

wherein the glass ceramic is characterized by the following color coordinates:

L*: 20.0 to 40.0;

a*: −1.0 to 1.0; and

b*: −5.0 to 2.0.

2. The glass ceramic of claim 1 , wherein the primary crystal phase is a lithium metasilicate.

3. The glass ceramic of claim 1 , wherein the primary crystal phase is lithium disilicate.

4. The glass ceramic of claim 1 , wherein the glass ceramic has a transmittance of less than 1% in the visible light range.

5. The glass ceramic of claim 1 , wherein the glass ceramic has a ring-on-ring strength of at least 290 MPa.

6. The glass ceramic of claim 1 , wherein the glass ceramic has a fracture toughness of greater than or equal to 0.9 MPa·m 0.5 to less than or equal to 2.0 MPa·m 0.5 .

7. The glass ceramic of claim 1 , wherein the glass ceramic has a fracture toughness of greater than or equal to 1.0 MPa·m 0.5 to less than or equal to 1.5 MPa·m 0.5 .

8. The glass ceramic of claim 1 , further comprising:

55.0 wt % to 75.0 wt % SiO 2 ;

2.0 wt % to 20.0 wt % Al 2 O 3 ;

0 wt % to 5.0 wt % B 2 O 3 ;

5.0 wt % to 15.0 wt % Li 2 O;

0 wt % to 5.0 wt % Na 2 O;

0 wt % to 4.0 wt % K 2 O;

0 wt % to 8.0 wt % MgO;

0 wt % to 10.0 wt % ZnO;

0.5 wt % to 5.0 wt % TiO 2 ;

1.0 wt % to 6.0 wt % P 2 O 5;

2.0 wt % to 10.0 wt % ZrO 2 ;

0 wt % to 0.4 wt % CeO 2 ;

0.05 wt % to 0.5 wt % SnO+SnO 2 ;

0.1 wt % to 5.0 wt % FeO+Fe 2 O 3 ;

0.1 wt % to 5.0 wt % NiO;

0.1 wt % to 5.0 wt % Co 3 O 4 ;

0 wt % to 4.0 wt % MnO+MnO 2 +Mn 2 O 3 ;

0 wt % to 2.0 wt % Cr 2 O 3 ;

0 wt % to 2.0 wt % CuO; and

0 wt % to 2.0 wt % V 2 O 5 .

9. The glass ceramic of claim 1 , further comprising:

65.0 wt % to 75.0 wt % SiO 2 ;

7.0 wt % to 11.0 wt % Al 2 O 3 ;

6.0 wt % to 11.0 wt % Li 2 O;

2.0 wt % to 4.0 wt % TiO 2 ;

1.5 wt % to 2.5 wt % P 2 O 5 ;

2.0 wt % to 4.0 wt % ZrO 2 ;

1.0 wt % to 4.0 wt % FeO+Fe 2 O 3 ;

0.5 wt % to 1.5 wt % NiO; and

0.1 wt % to 0.4 wt % Co 3 O 4 .

10. The glass ceramic of claim 1 , wherein the glass ceramic has a crystallinity of greater than 50 wt %.

11. The glass ceramic of claim 1 , wherein the glass ceramic is ion exchanged and comprises a compressive stress layer extending from a surface of the glass ceramic to a depth of compression.

12. The glass ceramic of claim 11 , wherein the glass ceramic has a compressive stress at the surface of at least 250 MPa.

13. The glass ceramic of claim 11 , wherein the glass ceramic has a compressive stress at the surface of greater than or equal to 250 MPa to less than or equal to 650 MPa.

14. The glass ceramic of claim 11 , wherein the depth of compression is at least 0.05t, where t is a thickness of glass ceramic.

15. The glass ceramic of claim 11 , wherein the glass ceramic has a ring-on-ring strength of at least 900 MPa.

16. 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 glass disposed over the display,

wherein at least a portion of the housing comprises the glass ceramic of claim 1 .

17. 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 glass disposed over the display,

wherein at least a portion of the housing comprises the glass ceramic of claim 11 .

18. A method, comprising:

ceramming a precursor glass-based article to form a glass ceramic,

wherein the glass ceramic comprises:

at least one lithium silicate crystal phase as a primary crystal phase; and

at least one of petalite, β-quartz, β-spodumene, cristobalite, and lithium phosphate as a minor crystal phase, and

the glass ceramic is characterized by the following color coordinates:

L*: 20.0 to 40.0;

a*: −1.0 to 1.0; and

b*: −5.0 to 2.0.

19. The method of claim 18 , wherein the ceramming occurs at a temperature of greater than or equal to 500° C. to less than or equal to 900° C.

20. The method of claim 18 , wherein the ceramming occurs for a period of greater than or equal to 6 hours to less than or equal to 16 hours.

21. The method of claim 18 , further comprising ion exchanging the glass ceramic.

22. The method of claim 18 , wherein the precursor glass-based article comprises:

55.0 wt % to 75.0 wt % SiO 2 ;

2.0 wt % to 20.0 wt % Al 2 O 3 ;

0 wt % to 5.0 wt % B 2 O 3 ;

5.0 wt % to 15.0 wt % Li 2 O;

0 wt % to 5.0 wt % Na 2 O;

0 wt % to 4.0 wt % K 2 O;

0 wt % to 8.0 wt % MgO;

0 wt % to 10.0 wt % ZnO;

0.5 wt % to 5.0 wt % TiO 2 ;

1.0 wt % to 6.0 wt % P 2 O 5 ;

2.0 wt % to 10.0 wt % ZrO 2 ;

0 wt % to 0.4 wt % CeO 2 ;

0.05 wt % to 0.5 wt % SnO+SnO 2 ;

0.1 wt % to 5.0 wt % FeO+Fe 2 O 3 ;

0.1 wt % to 5.0 wt % NiO;

0.1 wt % to 5.0 wt % Co 3 O 4 ;

0 wt % to 4.0 wt % MnO+MnO 2 +Mn 2 O 3 ;

0 wt % to 2.0 wt % Cr 2 O 3 ;

0 wt % to 2.0 wt % CuO; and

0 wt % to 2.0 wt % V 2 O 5 .

23. The method of claim 18 , wherein the precursor glass-based article comprises:

65.0 wt % to 75.0 wt % SiO 2 ;

7.0 wt % to 11.0 wt % Al 2 O 3 ;

6.0 wt % to 11.0 wt % Li 2 O;

2.0 wt % to 4.0 wt % TiO 2 ;

1.5 wt % to 2.5 wt % P 2 O 5 ;

2.0 wt % to 4.0 wt % ZrO 2 ;

1.0 wt % to 4.0 wt % FeO+Fe 2 O 3 ;

0.5 wt % to 1.5 wt % NiO; and

0.1 wt % to 0.4 wt % Co 3 O 4 .