Alkali-free phosphoborosilicate glass

Patent metadata

Field	Value
Publication number	US-9527767-B2
Application number	US-201414267086-A
Country	US
Kind code	B2
Filing date	May 1, 2014
Priority date	May 9, 2013
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

Alkali-free phosphoboroaluminosilicate glasses are provided. The glasses include the network formers SiO 2 , B 2 O 3 , and at least one of Al 2 O 3 and P 2 O 5 . The glass may, in some embodiments, have a Young's modulus of less than about 78 GPa and/or a coefficient of thermal expansion, averaged over a temperature range from about 20° C. to about 300° C., of less than about 38×10 −7 /° C. The glass may be used as a cover glass for electronic devices or as an outer clad layer for a glass laminate.

First claim

The invention claimed is:

1. A glass, the glass comprising: from 50 mol % to 75 mol % SiO 2 ; from greater than 0 mol % to 20 mol % Al 2 O 3 ; from greater than 0 mol % to 35 mol % B 2 O 3 ; from 3 mol % to 20 mol % P 2 O 5 ; up to about 5 mol % MgO; up to 10 mol % CaO; up to 5 mol % SrO; up to 0.5 mol % Fe 2 O 3 ; and up to 0.1 mol % ZrO 2 wherein:
the glass comprises at least one fining agent, the at least one fining agent comprising at least one of SnO 2 ,CeO 2 ,Sb 2 O 3 , and Cl − ; and
the glass is substantially free of alkali metal modifiers.

2. The glass of claim 1 , wherein the glass has a Young's modulus of less than 78 GPa.

3. The glass of claim 2 , wherein the Young's modulus is less than 60 GPa.

4. The glass of claim 1 , wherein the glass has a coefficient of thermal expansion of less than 38×10 −7 /° C. averaged over a temperature range from 20° C. to 300° C.

5. The glass of claim 4 , wherein the coefficient of thermal expansion is less than 20×10 −7 /° C. averaged over a temperature range from 20° C. to 300° C.

6. The glass of Claim 1 , wherein the at least one fining agent comprises at least one of up to 0.7 mol % SnO 2 and up to 0.5 mol % Sb 2 O 3 .

7. The glass of claim 1 , wherein the total amount of MgO, CaO, and SrO in the glass is less than or equal to 0.2 mol %.

8. The glass of claim 1 , wherein the glass is substantially free of alkaline earth modifiers.

9. The glass of claim 1 , wherein the glass comprises: from 55 mol % to 72 mol % SiO 2 ; from greater than 0 mol % to 16 mol % Al 2 O 3 ; from 8 mol % to 35 mol % B 2 O 3 ; from 3 mol % to 20 mol % P 2 O 5 ; up to 5 mol % MgO; up to 0.2 mol % CaO; up to 0.2 mol % SrO; up to 0.2 mol % SnO 2 ; and up to 0.1 mol % ZrO 2 .

10. The glass of claim 1 , wherein the glass forms a clad layer in a glass laminate comprising a core glass, wherein the core glass has a coefficient of thermal expansion that is greater than a coefficient of thermal expansion of the clad layer.

11. The glass of claim 10 , wherein the core glass has a coefficient of thermal expansion that is greater than a coefficient of thermal expansion of the clad layer, and the clad layer is under a compressive stress of at least 100 MPa.

12. The glass of claim 1 , wherein the glass forms at least a portion of a color filter, a transistor substrate, a cover glass, a touch interface, or combinations thereof.

13. The glass of claim 1 , wherein the glass has a strain point of less than 800° C.

14. The glass of claim 1 , wherein the glass has a liquidus viscosity of at least 150 kpoise.

15. The glass of claim 14 , wherein the glass is down-drawable.

16. A glass comprising SiO 2 , B 2 O 3 , Al 2 O 3 , and from 3 mol % to 20 mol % P 2 O 5 , wherein the glass is substantially free of alkali metal modifiers, and wherein:
the glass comprises at least one fining agent, the at least one fining agent comprising at least one of SnO 2 , CeO 2 , Sb 2 O 3 , and Cl − ;
the glass is substantially free of alkaline earth modifiers; and
the glass has at least one of a Young's modulus of less than 78 GPa and a coefficient of thermal expansion of less than 38×10 −7 /° C. averaged over a temperature range from 20° C. to 300° C.

17. The glass of claim 16 , wherein the Young's modulus is less than 60 GPa.

18. The glass of claim 16 , wherein the coefficient of thermal expansion is less than 20×10 −7 /° C. averaged over a temperature range from 20° C. to 300° C.

19. The glass of claim 16 , wherein the glass comprises: from 50 mol % to 75 mol % SiO 2 ; from greater than 0 mol % to 20 mol % Al 2 O 3 ; from greater than 0 mol % to 35 mol % B 2 O 3 ; from 3 mol % to 20 mol % P 2 O 5 ; up to 0.5 mol % Fe 2 O 3 ; and up to 0.1 mol % ZrO 2 .

20. The glass of claim 19 , wherein the glass comprises: from 55 mol % to 72 mol % SiO 2 ; from greater than 0 mol % to 16 mol % Al 2 O 3 ; from 8 mol % to 35 mol % B 2 O 3 ; from 3 mol % to 20 mol % P 2 O 5 ; up to 0.2 mol % SnO 2 ; and up to 0.1 mol % ZrO 2 .

21. The glass of claim 20 , wherein the at least one fining agent comprises 0.2 mol % SnO 2 .

22. The glass of claim 16 , wherein the at least one fining agent comprises at least one of up to 0.7 mol % SnO 2 and up to 0.5 mol % Sb 2 O 3 .

23. The glass of claim 16 , wherein the glass forms a clad layer in a glass laminate comprising a core glass, wherein the core glass has a coefficient of thermal expansion that is greater than a coefficient of thermal expansion of the clad layer.

24. The glass of claim 23 , wherein the clad layer is under a compressive stress of at least 100 MPa.

25. The glass of claim 16 , wherein the glass forms at least a portion of a color filter transistor substrate, a cover glass, or a touch interface.

26. The glass of claim 16 , wherein the glass has a liquidus viscosity of at least 150 kpoise.

27. The glass of claim 26 , wherein the glass is down-drawable.

28. The glass of claim 16 , wherein the glass has a strain point of less than 800° C.

29. The glass of claim 16 , wherein the glass has at least one of a Young's modulus of less than 78 GPa and a coefficient of thermal expansion of less than 20×10 −7 /° C. averaged over a temperature range from 20° C. to 300° C.

30. A glass laminate, the glass laminate comprising a core glass and a clad glass laminated onto an outer surface of the core glass, the clad glass layer comprising from 50 mol % to 75 mol % SiO 2 , from greater than 0 mol % to 35 mol % B 2 O 3 , from greater than 0 mol % to 20 mol % Al 2 O 3 , and from 3 mol % to 20 mol % P 2 O 5 , wherein:
the clad glass is substantially free of alkali metal modifiers;
the glass comprises at least one fining agent, the at least one fining agent comprising at least one of SnO 2 , CeO 2 , Sb 2 O 3 , and Cl − ; and
wherein the clad glass has a first coefficient of thermal expansion of less than 38×10 −7 /° C. averaged over a temperature range from 20° C. to 300° C. and the core glass has a second coefficient of thermal expansion that is greater than the first coefficient of thermal expansion.

31. The glass laminate of claim 30 , wherein the first coefficient of thermal expansion is less than 20×10 −7 /° C. averaged over a temperature range from 20° C. to 300° C.

32. The glass laminate of claim 30 , wherein the clad glass further comprises: up to 0.5 mol % Fe 2 O 3 ; and up to 0.1 mol % ZrO 2 .

33. The glass laminate of claim 32 , wherein the at least one fining agent comprises at least one of up to 0.7 mol % SnO 2 , and up to 0.5 mol % Sb 2 O 3 .

34. The glass laminate of claim 32 , wherein the total amount of MgO, CaO, and SrO in the glass is less than or equal to 0.2 mol %.

35. The glass laminate of claim 32 , wherein the glass comprises: from 55 mol % to 72 mol % SiO 2 ; from greater than 0 mol % to 16 mol % Al 2 O 3 ; from 8 mol % to 35 mol % B 2 O 3 ; from 3 mol % to 20 mol % P 2 O 5 ; up to 5 mol % MgO; up to 0.2 mol % CaO; up to 0.2 mol % SrO; up to 0.2 mol % SnO 2 ; and up to 0.1 mol % ZrO 2 .

36. The glass laminate of claim 30 , wherein the clad glass is substantially free of alkaline earth modifiers.

37. The glass laminate of claim 30 , wherein the clad glass is under a compressive stress of at least 100 MPa.

38. The glass laminate of cl

Assignees

• Corning Inc

Inventors

• Ellison Adam James
• Mauro John Christopher
• Venkataraman Natesan

Classifications

• C03C3/097 Primary

  containing phosphorus, niobium or tantalum · CPC title

• C03B17/02

  Forming {molten} glass coated with coloured layers; {Forming molten glass of different compositions or layers; Forming molten glass comprising reinforcements or inserts} · CPC title

• B32B17/06

  comprising glass as the main or only constituent of a layer, next to another layer of a specific {material} · CPC title

• Y10T428/24942

  including components having same physical characteristic in differing degree · CPC title

• B32B2457/208

  Touch screens · CPC title