Glass compositions and methods with steam treatment haze resistance

Patent metadata

Field	Value
Publication number	US-11370696-B2
Application number	US-202017611222-A
Country	US
Kind code	B2
Filing date	May 12, 2020
Priority date	May 16, 2019
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

Glass-based articles that include a compressive stress layer extending from a surface of the glass-based article to a depth of compression are formed by exposing glass-based substrates to water vapor containing environments. The glass-based substrates have compositions selected to avoid the formation of haze during the treatment process. The methods of forming the glass-based articles may include elevated pressures and/or multiple exposures to water vapor containing environments selected to avoid the formation of haze during the treatment process.

First claim

What is claimed is:

1. A glass-based article, comprising:
a hydrogen-containing layer extending from the surface of the glass-based article to a depth of layer, wherein a hydrogen concentration of the hydrogen-containing layer decreases from a maximum hydrogen concentration to the depth of layer;
a compressive stress layer extending from the surface of the glass-based article to a depth of compression, wherein the compressive stress layer comprises a compressive stress of greater than or equal to 10 MPa; and
a composition at the center of the glass-based article comprising:
greater than or equal to 55 mol % to less than or equal to 70 mol % SiO 2 ,
greater than or equal to 3 mol % to less than or equal to 17 mol % Al 2 O 3 ,
greater than or equal to 3 mol % to less than or equal to 15 mol % P 2 O 5 ,
greater than or equal to 1 mol % to less than or equal to 7 mol % Li 2 O, and
greater than or equal to 5 mol % to less than or equal to 20 mol % K 2 O.

2. The glass-based article of claim 1 , wherein the composition at the center of the glass-based article further comprises greater than or equal to 0 mol % to less than or equal to 1 mol % Na 2 O.

3. The glass-based article of claim 1 , wherein the composition at the center of the glass-based article further comprises greater than or equal to 0 mol % to less than or equal to 0.5 mol % SnO 2 .

4. The glass-based article of claim 1 , wherein the compressive stress layer comprises a compressive stress of greater than or equal to 50 MPa.

5. The glass-based article of claim 1 , wherein the compressive stress layer comprises a compressive stress of greater than or equal to 300 MPa.

6. The glass-based article of claim 1 , wherein the depth of compression is greater than or equal to 5 μm.

7. The glass-based article of claim 1 , wherein the compressive stress layer comprises a compressive stress of greater than or equal to 300 MPa and the depth of compression is greater than or equal to 40 μm.

8. The glass-based article of claim 1 , wherein the depth of compression is greater than or equal to 100 μm.

9. The glass-based article of claim 1 , wherein a glass having a composition equivalent to the composition at the center of the article has a 200 P temperature of less than or equal to 1715° C.

10. The glass-based article of claim 1 , wherein a glass having a composition equivalent to the composition at the center of the article has a liquidus viscosity of greater than or equal to 10 kP.

11. The glass-based article of claim 1 , wherein a glass having a composition equivalent to the composition at the center of the article has a Young's modulus of greater than or equal to 50 GPa.

12. The glass-based article of claim 1 , wherein the glass-based article has a thickness of less than or equal to 2 mm.

13. The glass-based article of claim 1 , wherein the glass-based article has a substantially haze-free appearance.

14. A consumer electronic product, comprising:
a housing comprising a front surface, a back surface and side surfaces;
electrical components at least partially within the housing, the electrical components comprising at least a controller, a memory, and a display, the display at or adjacent the front surface of the housing; and
a cover substrate disposed over the display,
wherein at least a portion of at least one of the housing and the cover substrate comprises the glass-based article of claim 1 .

Assignees

• Corning Inc

Inventors

• Gross Timothy Michael
• Wu Jingshi

Classifications

• C03C21/007

  in gaseous phase · CPC title

• C03C2204/00

  Glasses, glazes or enamels with special properties · CPC title

• C03C4/18

  for ion-sensitive glass · CPC title

• C03C3/097 Primary

  containing phosphorus, niobium or tantalum · CPC title

• C03B27/04

  using gas · CPC title