Glass ceramic articles having improved properties and methods for making the same

Patent metadata

Field	Value
Publication number	US-11014848-B2
Application number	US-201916510850-A
Country	US
Kind code	B2
Filing date	Jul 12, 2019
Priority date	Jul 16, 2018
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

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.

First claim

What is claimed is:

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.

Assignees

• Corning Inc

Inventors

• Click Carol Ann
• Edmonston James Howard
• Fu Qiang
• Hall Jill Marie
• Hubert Mathieu Gerard Jacques
• Joshi Dhananjay
• Kittleson Andrew Peter
• Kroemer Katherine Weber
• Moore Galan Gregory
• Rai Rohit
• Ridge John Richard
• Saltzer Jr John Robert
• Smith Charlene Marie
• Stapleton Erika Lynn
• Trosa Matthew Daniel
• Ukrainczyk Ljerka
• Wilson Shelby Kerin
• Yang Bin
• Zheng Zheming

Classifications

• C03C10/0027 Primary

  containing SiO2, Al2O3, Li2O as main constituents · CPC title

• C03C3/097 Primary

  containing phosphorus, niobium or tantalum · CPC title

• C03C21/002

  to perform ion-exchange between alkali ions (C03C21/005 takes precedence) · CPC title

• C03C10/0054

  containing PbO, SnO2, B2O3 · CPC title

• C03C10/0018

  containing SiO2, Al2O3 and monovalent metal oxide as main constituents · CPC title