Thermally strengthened consumer electronic glass and related systems and methods

Patent metadata

Field	Value
Publication number	US-12338159-B2
Application number	US-202418403845-A
Country	US
Kind code	B2
Filing date	Jan 4, 2024
Priority date	Jul 30, 2015
Publication date	Jun 24, 2025
Grant date	Jun 24, 2025

Abstract

A strengthened cover glass or glass-ceramic sheet or article as well as processes and systems for making the strengthened glass or glass-ceramic sheet or article is provided for use in consumer electronic devices. The process comprises cooling the cover glass sheet by non-contact thermal conduction for sufficiently long to fix a surface compression and central tension of the sheet. The process results in thermally strengthened cover glass sheets for use in or on consumer electronic products.

First claim

What is claimed is:

1. A glass sheet for use in or on consumer electronic products, the glass sheet comprising:
glass comprising soda-lime glass, alkali aluminosilicate glass, alkali-containing borosilicate glass, alkali aluminophosphosilicate glass, or alkali aluminoborosilicate glass;
a first major surface opposite a second major surface with an interior region located therebetween;
wherein surface fictive temperature measured on the first major surface is at least 50° C. above a glass transition temperature of the glass of the glass sheet;
wherein an average thickness between the first and second major surfaces is less than 2 mm;
wherein an ion content and chemical constituency of at least a portion of both the first major surface and the second major surface is the same as an ion content and chemical constituency of at least a portion of the interior region;
wherein the first and second major surfaces are under compressive stress greater than 150 MPa and at least a portion of the interior region is under tensile stress.

2. The glass sheet of claim 1 , wherein the first and second major surfaces are flat to at least 50 μm total indicator run-out along a 50 mm profile of the first and second major surfaces.

3. The glass sheet of claim 1 , wherein the areas of the first and second major surfaces are at least 2500 mm 2 .

4. The glass sheet of claim 1 , wherein the glass of the glass sheet has a coefficient of thermal expansion greater than 40×10 −7 /° C.

5. The glass sheet of claim 1 , wherein thickness of the glass sheet is about 0.1 mm to about 1.5 mm.

6. The glass sheet of claim 5 , wherein the glass sheet further comprises a depth of compression that is greater than 17% of the thickness.

7. The glass sheet of claim 5 , wherein the glass sheet at the thickness thereof exhibits an average light transmission over a wavelength range from 400 nm to 780 nm of 85% or greater.

8. A glass sheet for use in or on consumer electronic products, the glass sheet comprising:
glass comprising soda-lime glass, alkali aluminosilicate glass, alkali-containing borosilicate glass, alkali aluminophosphosilicate glass, or alkali aluminoborosilicate glass;
a first major surface opposite a second major surface with an interior region located therebetween;
wherein surface fictive temperature measured on the first major surface is at least 50° C. above a glass transition temperature of the glass of the glass sheet;
wherein an average thickness between the first and second major surfaces is less than 2 mm;
wherein an ion content and chemical constituency of at least a portion of both the first major surface and the second major surface is the same as an ion content and chemical constituency of at least a portion of the interior region;
wherein the first and second major surfaces are under compressive stress greater than 150 MPa and at least a portion of the interior region is under tensile stress;
wherein stress within the glass sheet varies as a function of position relative to the first and second major surfaces, wherein the stress has a change of at least 200 MPa over a distance of less than 500 μm of thickness of the glass sheet.

9. The glass sheet of claim 8 , wherein the first and second major surfaces are flat to at least 50 μm total indicator run-out along a 50 mm profile of the first and second major surfaces.

10. The glass sheet of claim 8 , wherein the areas of the first and second major surfaces are at least 2500 mm 2 .

11. The glass sheet of claim 8 , wherein the glass of the glass sheet has a coefficient of thermal expansion greater than 40×10 −7 /° C.

12. The glass sheet of claim 10 , wherein thickness of the glass sheet is about 0.1 mm to about 1.5 mm.

13. The glass sheet of claim 12 , wherein the glass sheet at the thickness thereof exhibits an average light transmission over a wavelength range from 400 nm to 780 nm of 85% or greater.

14. The glass sheet of claim 12 , wherein the glass sheet further comprises a depth of compression that is greater than 17% of the thickness.

15. A glass sheet for use in or on consumer electronic products, the glass sheet comprising:
glass comprising soda-lime glass, alkali aluminosilicate glass, alkali-containing borosilicate glass, alkali aluminophosphosilicate glass, or alkali aluminoborosilicate glass;
a first major surface opposite a second major surface with an interior region located therebetween;
wherein surface fictive temperature measured on the first major surface is at least 50° C. above a glass transition temperature of the glass of the glass sheet;
wherein an average thickness between the first and second major surfaces is less than 2 mm;
wherein an ion content and chemical constituency of at least a portion of both the first major surface and the second major surface is the same as an ion content and chemical constituency of at least a portion of the interior region;
wherein the first and second major surfaces are under compressive stress greater than 150 MPa and at least a portion of the interior region is under tensile stress;
wherein the areas of the first and second major surfaces are at least 2500 mm 2 ; and
wherein the glass sheet further comprises a depth of compression that is greater than 17% of the thickness.

16. The glass sheet of claim 15 , wherein stress within the glass sheet varies as a function of position relative to the first and second major surfaces, wherein the stress has a change of at least 200 MPa over a distance of less than 500 μm of thickness of the glass sheet.

17. The glass sheet of claim 15 , wherein a surface roughness of the second major surface is between 0.2 and 1.5 nm Ra roughness.

18. The glass sheet of claim 15 , wherein the first and second major surfaces are flat to at least 50 μm total indicator run-out along a 50 mm profile of the first and second major surfaces.

Assignees

• Corning Inc

Inventors

• Lezzi Peter Joseph
• Maschmeyer Richard Orr
• Thomas John Christopher
• Wasson Kevin Lee

Classifications

• C03C21/002

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

• C03C3/11

  containing halogen or nitrogen · CPC title

• C03B35/24

  on a gas support bed · CPC title

• C03B29/16

  Glass sheets · CPC title

• C03B29/12

  being in a horizontal position on a fluid support, e.g. a gas or molten metal · CPC title