Glass ceramic articles having improved properties and methods for making the same
A glass ceramic article including a lithium disilicate crystalline phase, a petalite crystalline phased, and a residual glass phase. The glass ceramic article has a warp (μm)<(3.65×10 −9 /μm×diagonal 2 ) where diagonal is a diagonal measurement of the glass ceramic article in μm, a stress of less than 30 nm of retardation per mm of glass ceramic article thickness, a haze (%)<0.0994t +0.12 where t is the thickness of the glass ceramic article in mm, and an optical transmission (%)>0.91×10 (2-0.03t) of electromagnetic radiation wavelengths from 450 nm to 800 nm, where t is the thickness of the glass ceramic article in mm.
1. A glass ceramic article comprising:
a lithium disilicate crystalline phase;
a petalite crystalline phased; and
a residual glass phase, wherein
the glass ceramic article comprises:
a warp (μm)<(3.65×10 −9 /μm×diagonal 2 ) where diagonal is a diagonal measurement of the glass ceramic article in μm;
a stress of less than 30 nm of retardation per mm of glass ceramic article thickness;
a haze (%)<0.0994t+0.12 where t is the thickness of the glass ceramic article in mm; and
an optical transmission (%)>0.91×10 (2-0.03t) of electromagnetic radiation wavelengths from 450 nm to 800 nm, where t is the thickness of the glass ceramic article in mm.
2. The glass ceramic article of claim 1 , wherein the glass ceramic article has a fracture toughness in a range from 1.0 MPa√m to 2.0 MPa√m.
3. The glass ceramic article of claim 1 , wherein the glass ceramic article has a hardness measured by a Vickers indenter at a 200 gram load of greater than 680 kgf.
4. The glass ceramic article of claim 1 , wherein the glass ceramic article is strengthened and has compressive stress greater than 175 MPa.
5. The glass ceramic article of claim 4 , wherein the glass ceramic article has a central tension greater than or equal to 80 MPa.
6. The glass ceramic article of claim 4 , wherein the glass ceramic article has a depth of compression of 0*t to 0.3*t, where t is thickness of the glass ceramic article.
7. The glass ceramic article of claim 1 , wherein the glass ceramic article comprises greater than 20 wt % of the lithium disilicate crystalline phase.
8. The glass ceramic article of claim 1 , wherein the glass ceramic article comprises greater than 20 wt % of the petalite crystalline phase.
9. The glass ceramic article of claim 1 , wherein the glass ceramic article comprises from 5 wt % to 30 wt % of the residual glass phase.
10. The glass ceramic article of claim 1 , wherein the glass ceramic article comprises a warp measured on 156 mm×76 mm glass articles of less than 100 μm.
11. The glass ceramic article of claim 1 , wherein the glass ceramic article comprises a stress of less than 25 nm of retardation per mm of glass ceramic article thickness.
12. The glass ceramic article of claim 1 , wherein the glass ceramic article comprises a haze measured at 0.8 mm thickness of less than 0.20.
13. The glass ceramic article of claim 1 , wherein the glass ceramic article comprises an optical transmission of electromagnetic radiation wavelengths from 450 nm to 800 nm measured at 0.8 mm thickness of greater than 85%.
14. The glass ceramic article of claim 1 , wherein the glass ceramic article has a thickness from 0.3 mm and 1.0 mm.
15. The glass ceramic article of claim 1 , wherein the glass ceramic article comprises a lithium phosphate crystalline phase.
16. An electronic device comprising a transparent surface, the transparent surface comprising a glass ceramic article having a thickness of from 0.3 mm to 1.0 mm, the glass ceramic article comprises:
a lithium disilicate crystalline phase;
a petalite crystalline phased; and
a residual glass phase, wherein
the glass ceramic article comprises:
a warp (μm)<(3.65×10 −9 /μm×diagonal 2 ) where diagonal is a diagonal measurement of the glass ceramic article in μm;
a stress of less than 30 nm of retardation per mm of glass ceramic article thickness;
a haze (%)<0.0994t+0.12 where t is the thickness of the glass ceramic article in mm; and
an optical transmission (%)>0.91×10 (2-0.03t) of electromagnetic radiation wavelengths from 450 nm to 800 nm, where t is the thickness of the glass ceramic article in mm.
17. The glass ceramic article of claim 16 , wherein the glass ceramic article has a fracture toughness in a range from 1.0 MPa√m to 2.0 MPa√m.
18. The glass ceramic article of claim 16 , wherein the glass ceramic article has a hardness measured by a Vickers indenter at a 200 gram load of greater than 680 kgf.
19. The glass ceramic article of claim 16 , wherein the glass ceramic article is strengthened and has compressive stress greater than 175 MPa.
20. The glass ceramic article of claim 19 , wherein the glass ceramic article has a central tension greater than or equal to 80 MPa.
21. The glass ceramic article of claim 19 , wherein the glass ceramic article has a depth of compression of 0*t to 0.3*t, where t is thickness of the glass ceramic article.
22. The glass ceramic article of claim 16 , wherein the glass ceramic article comprises greater than 20 wt % of the lithium disilicate crystalline phase.
23. The glass ceramic article of claim 16 , wherein the glass ceramic article comprises greater than 20 wt % of the petalite crystalline phase.
24. The glass ceramic article of claim 16 , wherein the glass ceramic article comprises from 5 wt % to 30 wt % of the residual glass phase.
25. The glass ceramic article of claim 16 , wherein the glass ceramic article comprises a warp measured on 156 mm×76 mm sheets of less than 100 μm.
26. The glass ceramic article of claim 16 , wherein the glass ceramic article comprises a stress of less than 25 nm of retardation per mm of sheet thickness.
27. The glass ceramic article of claim 16 , wherein the glass ceramic article comprises a haze measured at 0.8 mm thickness of less than 0.20.
28. The glass ceramic article of claim 16 , wherein the glass ceramic article comprises an optical transmission of electromagnetic radiation wavelengths from 450 nm to 800 nm measured at 0.8 mm thickness of greater than 85%.
29. The glass ceramic article of claim 16 , wherein the glass ceramic article has a thickness from 0.3 mm and 1.0 mm.