Alkali-doped and alkali-free boroaluminosilicate glass

Patent metadata

Field	Value
Publication number	US-10000409-B2
Application number	US-201715478571-A
Country	US
Kind code	B2
Filing date	Apr 4, 2017
Priority date	Aug 15, 2013
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

Alkali-doped boroaluminosilicate glasses are provided. The glasses include the network formers SiO 2 , B 2 O 3 , and Al 2 O 3 . The glass may, in some embodiments, have a Young's modulus of less than about 65 GPa and/or a coefficient of thermal expansion of less than about 40×10 −7 /° C. The glass may be used as a cover glass for electronic devices, a color filter substrate, a thin film transistor substrate, or an outer clad layer for a glass laminate.

First claim

The invention claimed is:

1. A glass, the glass comprising:
about 50 mol % to about 70 mol % SiO 2 ;
about 6 mol % to about 10 mol % Al 2 O 3 ;
about 18 mol % to about 30 mol % B 2 O 3 ;
up to about 5 mol % MgO;
up to about 10 mol % CaO;
up to about 5 mol % SrO; and
0.01 mol % to about 0.5 mol % Fe 2 O 3 ,
wherein MgO+CaO+SrO≤Al 2 O 3 , and a sum of alkali metal oxide modifiers is less than or equal to about 1 mol %.

2. The glass of claim 1 , wherein 4 mol %≤MgO+CaO+SrO≤Al 2 O 3 .

3. The glass of claim 1 , wherein the glass has a Young's modulus of less than about 65 GPa.

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

5. The glass of claim 1 , wherein the glass has a coefficient of thermal expansion of less than about 40×10 −7 /° C.

6. The glass of claim 5 , wherein the coefficient of thermal expansion is less than about 35×10 −7 /° C.

7. The glass of claim 1 , wherein the glass further comprises at least one of SnO 2 , CeO 2 , As 2 O 3 , Sb 2 O 5 , Cl − , and F − .

8. The glass of claim 1 , wherein the glass comprises at least one of:
up to about 0.7 mol % SnO 2 ;
up to about 0.7 mol % CeO 2 ;
up to about 0.5 mol % As 2 O 3 ; and
up to about 0.5 mol % Sb 2 O 3 .

9. The glass of claim 1 , wherein the glass comprises:
about 55 mol % to about 70 mol % SiO 2 ;
greater than 6 mol % to about 10 mol % Al 2 O 3 ;
about 18 mol % to about 30 mol % B 2 O 3 ;
up to about 3 mol % MgO;
up to about 10 mol % CaO; and
up to about 3 mol % SrO.

10. The glass of claim 9 , wherein the glass comprises up to about 0.2 mol % SnO 2 .

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

12. The glass of claim 11 , wherein the clad layer is under a compressive stress of at least about 40 MPa.

13. The glass of claim 1 , wherein the glass has a liquidus viscosity of at least 100 kpoise.

14. The glass of claim 1 , wherein the glass is down-drawable.

15. The glass of claim 1 , wherein the glass comprises up to about 0.1 mol % ZrO 2 .

16. The glass of claim 1 , wherein the glass is free of alkali metal oxide modifiers.

17. The glass of claim 1 , wherein the glass has a Knoop scratch threshold of at least 15 N.

18. The glass of claim 17 , wherein the glass has a Knoop scratch threshold of at least 20 N.

19. The glass of claim 1 , wherein the glass forms at least a portion of a color filter substrate, a thin film transistor substrate, a cover glass, or a touch interface.

20. The glass of claim 1 , wherein the glass comprises 0 mol % BaO.

Assignees

• Corning Inc

Inventors

• Ellison Adam James
• Frackenpohl Jason Sanger
• Mauro John Christopher
• Noni Jr Douglas Miles
• Venkataraman Natesan

Classifications

• C03C3/118 Primary

  containing aluminium · CPC title

• B32B17/06 Primary

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

• C03B17/064

  by the overflow downdraw fusion process; Isopipes therefor · CPC title

• C03C13/046 Primary

  Multicomponent glass compositions · CPC title