Coated glass-based articles with engineered stress profiles

Patent metadata

Field	Value
Publication number	US-11028014-B2
Application number	US-201816482035-A
Country	US
Kind code	B2
Filing date	Jan 31, 2018
Priority date	Jan 31, 2017
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

A glass-based substrate having a Young's modulus, a first surface, and a second surface. A coating, on at least one of the first and second surfaces, having a Young's modulus equal to or greater than the substrate Young's modulus. A compressive region having a compressive stress CS of from 750 MPa to 1200 MPa at a surface and extending to a depth of compression (DOC). The compressive region having a first portion and a second portion, the first portion extending from the first surface up to a first depth, the second portion extending from the first depth to the DOC, points in the first portion comprise a tangent having a slope that is less than −15 MPa/micrometers and greater than −60 MPa/micrometers, and points in the second portion comprise a tangent having a slope that is less than or equal to −1 MPa/micrometers and greater than −12 MPa/micrometers.

First claim

What is claimed is:

1. A coated glass-based article comprising:
a glass-based substrate comprising a substrate Young's modulus value and a first surface and a second surface opposing the first surface defining a substrate thickness (t) in a range of 0.1 millimeters to 3 millimeters;
a coating on at least one of the first surface or the second surface of the glass-based substrate, the coating comprising a coating Young's modulus value equal to or greater than the substrate Young's modulus value and comprising a coating thickness (t c ) from 80 nanometers to 10 micrometers; and
the glass-based substrate comprising a compressive region, the compressive region comprising a compressive stress (CS) of from 750 MPa to 1200 MPa at a surface of the glass-based article, the CS decreasing to zero at a depth of compression (DOC), the compressive region comprising a stress profile comprising a first portion and a second portion, the first portion extending from the first surface to a first depth, the second portion extending from the first depth to the DOC, points in the first portion comprise a tangent with a slope that is less than −15 MPa/micrometers and greater than −45 MPa/micrometers, and points in the second portion comprise a tangent with a slope that is less than or equal to −1 MPa/micrometers and greater than −12 MPa/micrometers, and the first depth is from about 20 microns to about 30 microns.

2. The coated glass-based article of claim 1 , wherein points in the second portion comprise a tangent with a slope that is less than or equal to −3 MPa/micrometers and greater than −8 MPa/micrometers.

3. The coated glass-based article of claim 1 , wherein the substrate Young's modulus value is from 60 GPa to 80 GPa and the coating Young's modulus value is from 70 GPa to 400 GPa.

4. The coated glass-based article of claim 1 , wherein the coating comprises a scratch resistant coating selected from Al 2 O 3 , AlN, AlO x N y , Si 3 N 4 , SiO x N y , Si u Al v O x N y , diamond, diamond-like carbon, Si x C y , Si x O y C z , ZrO 2 , TiO x N y and combinations thereof.

5. The coated glass-based article of claim 1 , wherein the glass-based substrate comprises a strengthened glass substrate selected from the group consisting of a laminated glass substrate, chemically strengthened glass substrate, a thermally strengthened glass substrate and a combination thereof.

6. The coated glass-based article of claim 1 , wherein the glass-based substrate comprises an ion exchangeable alkali aluminosilicate glass composition.

7. The coated glass-based article of claim 1 , wherein the alkali aluminosilicate glass further comprises up to 10 mol % Li 2 O.

8. The coated glass-based article of claim 1 , wherein the glass-based article is selected from the group consisting of an architectural glass substrate, a vehicle glazing, a vehicle interior glass substrate, an appliance glass substrate, a handheld device glass substrate, and a wearable device glass substrate.

9. The coated glass-based article of claim 1 , wherein the substrate thickness is in a range from 0.3 millimeters to 1 millimeter.

10. The coated glass-based article of claim 1 , wherein the coating thickness is in a range from 1 micrometer to 10 micrometers.

11. The coated glass-based article of claim 1 , wherein the coating is disposed on both the first surface and the second surface of the glass-based substrate.

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

13. A coated glass-based article comprising:
a glass-based substrate comprising a substrate Young's modulus value and a first surface and a second surface opposing the first surface defining a substrate thickness (t) in a range of 0.1 millimeters to 3 millimeters;
a coating on at least one of the first surface or the second surface of the glass-based substrate, the coating comprising a coating Young's modulus value equal to or greater than the substrate Young's modulus value and comprising a coating thickness (t c ) in a range of 80 nanometers and 10 microns, and the coating comprises a scratch resistant coating comprising ZrO 2 ; and
the glass-based substrate comprising a compressive region comprising a compressive stress CS of 750 MPa or more at a first surface of the glass-based substrate, the compressive region comprising a stress profile comprising a first portion and a second portion, the first portion extending from the first surface to a first depth, the second portion extending from the first depth to the DOC such that the CS at a depth of 10 micrometers from the first surface is 30% to 50% of the CS at the first surface, and points of the stress profile of the first portion comprise a first portion tangent and points of the stress profile of the second portion comprise a second portion tangent, wherein a ratio of the slope of the first portion tangent to the slope of the second portion tangent is from 1.25 to 60, and when the thickness (t) is less than 300 microns, the first depth is from 0.08·t to 0.1·t, and when the thickness (t) is 300 microns or more, the first depth is from about 16 microns to about 30 microns.

14. The coated glass-based article of claim 13 , wherein the compressive region comprises a compressive stress CS at the first surface of from 800 MPa to 1150 MPa.

15. The coated glass-based article of claim 13 , wherein the substrate Young's modulus value is from 60 GPa to 80 GPa and the coating Young's modulus value is from 70 GPa to 400 GPa.

16. The coated glass-based article of claim 13 , wherein the coating thickness is in a range from 1 micrometer to 10 micrometers.

17. The coated glass-based article of claim 13 , wherein the substrate thickness is in a range from 0.3 millimeters to 1 millimeter.

18. A consumer electronic product, comprising:
a housing comprising a front surface, a back surface and side surfaces;
electrical components provided at least partially within the housing, the electrical components comprising at least a controller, a memory, and a display, the display being provided at or adjacent the front surface of the housing; and
a cover glass disposed over the display,
wherein at least one of a portion of the housing or the cover glass comprises the coated glass-based article of claim 13 .

Assignees

• Corning Inc

Inventors

• Harris Jason Thomas
• Hu Guangli

Classifications

• C03C2217/78

  Coatings specially designed to be durable, e.g. scratch-resistant · CPC title

• C03C2217/228

  Other specific oxides · CPC title

• C03C2217/282

  Carbides, silicides · CPC title

• C03C2217/22

  ZrO2 · CPC title

• C03C2217/214

  Al2O3 · CPC title