Alkali-doped and alkali-free boroaluminosilicate glass

• US 10,000,409 B2
• Filed: 04/04/2017
• Issued: 06/19/2018
• Est. Priority Date: 08/15/2013
• Status: Expired

• Current Assignee: Corning Incorporated
• Original Assignee: Corning Incorporated
• Inventors: Ellison, Adam James, Frackenpohl, Jason Sanger, Mauro, John Christopher, Noni, Jr., Douglas Miles, Venkataraman, Natesan
• Primary Examiner(s): GROUP, KARL E
• Application Number:
  US15/478,571
• Publication Number:
  US 20170291845A1
• Time in Patent Office: 441 Days
• CPC Class Codes: B32B 17/06 comprising glass as the main or only constituent of a layer, next to another layer of a specific material
• CPC Class Codes: C03B 17/02 Forming molten glass coated with coloured layers; Forming molten glass of different compositions or layers; Forming molten glass comprising reinforcements or inserts
• CPC Class Codes: C03B 17/064 by the overflow downdraw fusion process; Isopipes therefor
• CPC Class Codes: C03C 13/046 Multicomponent glass compositions
• CPC Class Codes: C03C 3/091 containing aluminium
• CPC Class Codes: C03C 3/093 containing zinc or zirconium
• CPC Class Codes: C03C 3/095 containing rare earths
• CPC Class Codes: C03C 3/11 containing halogen or nitrogen
• CPC Class Codes: C03C 3/118 containing aluminium
• CPC Class Codes: H01Q 1/2283 mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 15/0013 said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40

Abstract

Alkali-doped boroaluminosilicate glasses are provided. The glasses include the network formers SiO₂, B₂O₃, and Al₂O₃. 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.

Claims

1. A glass, the glass comprising:

about 50 mol % to about 70 mol % SiO₂;

about 6 mol % to about 10 mol % Al₂O₃;

about 18 mol % to about 30 mol % B₂O₃;

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 % Fe₂O₃,

wherein MgO+CaO+SrO≤

Al₂O₃, 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≤

Al₂O₃.

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<sup>−

7</sup>/°

C.

6. The glass of claim 5, wherein the coefficient of thermal expansion is less than about 35×

10<sup>−

7</sup>/°

C.

7. The glass of claim 1, wherein the glass further comprises at least one of SnO₂, CeO₂, As₂O₃, Sb₂O₅, Cl⁻

, and F⁻

.

8. The glass of claim 1, wherein the glass comprises at least one of:

up to about 0.7 mol % SnO₂;

up to about 0.7 mol % CeO₂;

up to about 0.5 mol % As₂O₃; and

up to about 0.5 mol % Sb₂O₃.

9. The glass of claim 1, wherein the glass comprises:

about 55 mol % to about 70 mol % SiO₂;

greater than 6 mol % to about 10 mol % Al₂O₃;

about 18 mol % to about 30 mol % B₂O₃;

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 % SnO₂.

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 % ZrO₂.

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.