Coated glass articles

Patent metadata

Field	Value
Publication number	US-2024182356-A1
Application number	US-202318527526-A
Country	US
Kind code	A1
Filing date	Dec 4, 2023
Priority date	Dec 5, 2022
Publication date	Jun 6, 2024
Grant date	—

Abstract

A coated glass article is described herein that includes a glass substrate including a first major surface and a second major surface. The first major surface and the second major surface may be opposing sides of the glass substrate. The coated glass article includes an optical coating disposed on the first major surface of the glass substrate. The coated glass article may have a retained strength after impact damage of greater than or equal to 250 MPa. The coated glass article may have a failure height of greater than or equal to 50 cm as measured according to a Drop Test Method on 80 grit sandpaper. In addition, the substrate can comprise 5.0-10.0 mol % Li2O, 1.0-10.0 mol % Na2O, and a lithium to sodium molar ratio (Li2O:Na2O) from 1.2 to 2.0.

First claim

What is claimed is:

1 . A coated glass article comprising:
a glass substrate comprising a first major surface and a second major surface, wherein the first major surface and the second major surface are opposing sides of the glass substrate, wherein the glass substrate has a composition comprising:
SiO 2 in an amount greater than or equal to 50.0 mol % and less than or equal to 70.0 mol %;
Al 2 O 3 in an amount greater than or equal to 10.0 mol % and less than or equal to 20.0 mol %;
P 2 O 5 in an amount greater than or equal to 0.0 mol % and less than or equal to 2.0 mol %;
B 2 O 3 in an amount greater than or equal to 1.0 mol % and less than or equal to 6.0 mol %;
Li 2 O in an amount greater than or equal to 5.0 mol % and less than or equal to 10.0 mol %;
Na 2 O in an amount greater than or equal to 1.0 mol % and less than or equal to 10.0 mol %; and
K 2 O in an amount greater than or equal to 0.01 mol % and less than or equal to 1.0 mol %; and
an optical coating disposed on the first major surface of the glass substrate, the optical coating forming an anti-reflective surface, wherein the optical coating comprises a scratch-resistant layer and an anti-reflective coating comprising a plurality of alternating high refractive index and low refractive index layers disposed between the scratch-resistant layer and the glass substrate; and wherein, the optical coating has a physical thickness of from about 50 nm to about 10 microns; wherein the coated glass article exhibits a maximum hardness of from about 10 GPa to about 30 GPa measured at an indentation depth of about 600 nm from the anti-reflective surface of the optical coating, the maximum hardness measured by a Berkovich Indenter Hardness Test; and wherein the coated glass article exhibits a retained strength of greater than or equal to 250 MPa.

2 . The coated glass article of claim 1 , wherein the coated glass article exhibits a retained strength of from about 250 MPa to about 400 MPa.

3 . The coated glass article of claim 1 , wherein the coated glass article has a failure height of greater than or equal to 50 cm as measured according to a Drop Test Method on 80 grit sandpaper.

4 . The coated glass article of claim 1 , wherein the coated glass article has a failure height of from about 50 cm to about 220 cm as measured according to a Drop Test Method on 80 grit sandpaper.

5 . The coated glass article of claim 1 , wherein the glass substrate has a compressive stress of greater than or equal to 500 MPa.

6 . The coated glass article of claim 1 , wherein the glass substrate has a maximum central tension of greater than or equal to 20 MPa.

7 . The coated glass article of claim 1 , wherein the glass substrate has a maximum central tension of less than or equal to 160 MPa.

8 . The coated glass article of of claim 1 , wherein the glass substrate has a depth of layer of greater than or equal to 3.0 microns.

9 . The coated glass article of claim 1 , wherein the glass substrate has a depth of layer of less than or equal to 12 microns.

10 . The coated glass article of claim 1 , wherein the plurality of alternating high refractive index and low refractive index layers comprises at least 3 layers.

11 . The coated glass article of claim 1 , wherein each low refractive index layer comprises a silicon-containing oxide, and each high refractive index layer comprises a silicon-containing nitride or a silicon-containing oxynitride.

12 . The coated glass article of claim 1 , wherein the scratch-resistant layer is a high refractive index layer.

13 . The coated glass article of claim 1 , wherein the thickness of the scratch-resistant layer is from about 200 nm to about 5000 nm.

14 . The coated glass article of claim 1 , wherein:
each low refractive index layer comprises at least one of SiO 2 , Al 2 O 3 , GeO 2 , SiO, AlO x N y , SiO x N y , Si u Al v O x N y , MgO, MgAl 2 O 4 , MgF 2 , BaF 2 , CaF 2 , DyF 3 , YbF 3 , YF 3 , and CeF 3 , and each high refractive index layer comprises at least one of Si u Al v O x N y , Ta 2 O 5 , Nb 2 O 5 , AlN, Si 3 N 4 , AlO x N y , SiO x N y , SiN x , SiN x H y HfO 2 , TiO 2 , ZrO 2 , Y 2 O 3 , Al 2 O 3 , and MoO 3 .

15 . The coated glass article of claim 1 , wherein the coated glass article exhibits a two-sided average light transmittance measured at the anti-reflective surface of greater than or equal to about 92% over an optical wavelength regime in the range of from about 400 nm to about 800 nm.

16 . The coated glass article of claim 1 , wherein the coated glass article exhibits an average single side reflectance of less than or equal to 3% over an optical wavelength range of from about 410 nm to about 1050 nm.

17 . The coated glass article of claim 1 , wherein the coated glass article exhibits either one or both of:
article transmittance color coordinates in the (L*, a*, b*) colorimetry system at normal incidence under an International Commission on Illumination illuminant exhibiting a reference point color shift of less than about 2 from a reference point as measured at the anti-reflective surface, the reference point comprising at least one of the color coordinates (a*=0, b*=0) and the transmittance color coordinates of the substrate, and article reflectance color coordinates in the (L*, a*, b*) colorimetry system at normal incidence under an International Commission on Illumination illuminant exhibiting a reference point color shift of less than about 5 from a reference point as measured at the anti-reflective surface, the reference point comprising at least one of the color coordinates (a*=0, b*=0), the color coordinates (a*=−2, b*=−2), and the reflectance color coordinates of the substrate,
wherein, when the reference point is the color coordinates (a*=0, b*=0), the color shift is defined by √((a* article ) 2 +(b* article ) 2 ),
wherein, when the reference point is the color coordinates (a*=−2, b*=−2), the color shift is defined by √((a* article +2) 2 +(b* article +2) 2 ), and
wherein, when the reference point is the color coordinates of the substrate, the color shift is defined by √((a* article −a* substrate ) 2 +(b* article −b* substrate ) 2 ).

18 . The coated glass article of claim 1 , wherein the coated glass article exhibits:
A single side average photopic light reflectance measured at the anti-reflective surface at near normal incidence of about 10% or less over an optical wavelength regime in the range from about 400 nm to about 700 nm; and article reflectance color coordinates in the (L*, a*, b*) colorimetry system for at least one incidence angle from 0 degrees to 90 degrees under an International Commission on Illumination illuminant exhibiting a reference point color shift of more than about 18 from a reference point as measured at the anti-reflective surface, the reference point comprising at least one of the color coordinates (a*=0, b*=0), and the reflectance color coordinates of the substrate, wherein, when the reference point is the color coordinates (a*=0, b*=0), the color shift is defined by √((a*article)2+(b*article)2); and wherein, when the reference point is the color coordinates of the substrate, the color shift is defined by √((a*article−a*substrate)2+(b*article−b*substrate)2).

19 . The coated glass article of claim 1 , wherein the coated glass article exhibits either one or both of:
a single side photopic average light reflectance of about 12% or more; and a single side maximum reflectance of about 12% or more, measured at the anti-reflective surface for at least one near

Assignees

• Corning Inc

Inventors

• Egboiyi Benedict Osobomen
• Mayolet Alexandre Michel
• Subramanian Ananthanarayanan

Classifications

• C03C2217/78

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

• C03C2217/734

  comprising an alternation of high and low refractive indexes · CPC title

• G02B1/115

  Multilayers · CPC title

• C03C21/002

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

• C03C3/091

  containing aluminium · CPC title