Coated article with IR reflecting layer and method of making same

Patent metadata

Field	Value
Publication number	US-9816316-B2
Application number	US-201615213476-A
Country	US
Kind code	B2
Filing date	Jul 19, 2016
Priority date	Apr 21, 2008
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A low-E coating supported by a glass substrate, the coating from the glass substrate outwardly including at least the following layers: a dielectric layer of or including silicon nitride; a high index layer having a refractive index of at least 2.1; another dielectric layer of or including silicon nitride; a layer comprising zinc oxide; an infrared (IR) reflecting layer, wherein the coating includes only one IR reflecting layer; and an overcoat including (i) a layer comprising tin oxide and (ii) a layer comprising silicon nitride located over and contacting the layer comprising tin oxide. An IG unit including the coating may have a visible transmission of at least 70%.

First claim

The invention claimed is:

1. An IG window unit including a coating supported by a glass substrate, the coating from the glass substrate outwardly comprising at least the following:
a dielectric layer of Si 3 N 4 ;
a high index layer having a refractive index of at least 2.1;
another dielectric layer comprising silicon nitride;
a layer comprising zinc oxide;
an infrared (IR) reflecting layer comprising silver on the glass substrate, located over and directly contacting the layer comprising zinc oxide, wherein the coating includes only one IR reflecting layer;
an overcoat comprising (i) a layer comprising tin oxide and (ii) a layer comprising silicon nitride located over and contacting the layer comprising tin oxide;
wherein the IG unit has an SHGC value of at least 0.65, a visible transmission of at least 70%, and an Energy Rating of at least 25;
wherein the coating does not contain any titanium oxide based layer located over the IR reflecting layer; and
wherein said glass substrate is an interior glass substrate, the IG unit further comprising an exterior glass substrate to be located adjacent an exterior of a building in which the IG unit is provided, wherein the coating is provided on a surface of the interior glass substrate facing a gap between the interior and exterior glass substrates, and wherein the IG is configured to have, as viewed from an exterior of the building, a reflective a* value of from about −4 to 0 and a reflective b* value of from about −1 to +2.5.

2. The IG unit of claim 1 , wherein the IG unit has an SHGC value of at least 0.68, a visible transmission of at least 74.5%, and an Energy Rating of at least 29.

3. The IG unit of claim 1 , wherein the coating further comprising a layer comprising Ni and Cr located over and directly contacting the IR reflecting layer comprising silver.

4. The IG unit of claim 1 , wherein the high index layer has a refractive index of at least 2.3.

5. The IG unit of claim 1 , wherein the high index layer has a refractive index of from 2.3 to 2.6.

6. The IG unit of claim 1 , wherein the high index layer is located between and directly contacting said dielectric layer of Si 3 N 4 and said another dielectric layer comprising silicon nitride.

7. The IG unit of claim 6 , wherein said dielectric layer of Si 3 N 4 is in direct contact with the glass substrate.

8. The IG unit of claim 6 , wherein said layer comprising zinc oxide is in direct contact with said another dielectric layer comprising silicon nitride.

9. An IG window unit including a coating supported by a glass substrate, the coating from the glass substrate outwardly comprising at least the following:
a dielectric layer of Si 3 N 4 ;
a high index layer having a refractive index of at least 2.1;
another dielectric layer comprising silicon nitride;
a layer comprising zinc oxide;
an infrared (IR) reflecting layer comprising silver on the glass substrate, located over and directly contacting the layer comprising zinc oxide, wherein the coating includes only one IR reflecting layer;
an overcoat comprising (i) a layer comprising tin oxide and (ii) a layer comprising silicon nitride located over and contacting the layer comprising tin oxide;
wherein the IG unit has an SHGC value of at least 0.65, a visible transmission of at least 70%, and an Energy Rating of at least 25;
wherein the coating does not contain any titanium oxide based layer located over the IR reflecting layer; and
wherein the IG unit is configured to have, as viewed from an exterior of a building, a reflective a* value of from about −4 to 0 and a reflective b* value of from about −1 to +2.5.

10. The IG unit of claim 9 , wherein the IG unit is configured to have an SHGC value of at least 0.68, a visible transmission of at least 74.5%, and an Energy Rating of at least 29.

11. The IG unit of claim 9 , wherein the glass substrate is an interior glass substrate of the IG unit.

12. The IG unit of claim 9 , wherein the coating further comprising a layer comprising Ni and Cr located over and directly contacting the IR reflecting layer comprising silver.

13. The IG unit of claim 9 , wherein the high index layer has a refractive index of at least 2.3.

14. The IG unit of claim 9 , wherein the high index layer has a refractive index of from 2.3 to 2.6.

15. The IG unit of claim 9 , wherein the high index layer is located between and directly contacting said dielectric layer of Si 3 N 4 and said another dielectric layer comprising silicon nitride.

16. The IG unit of claim 9 , wherein said dielectric layer comprising silicon nitride is in direct contact with the glass substrate.

17. The IG unit of claim 9 , wherein said layer comprising zinc oxide is in direct contact with said another dielectric layer comprising silicon nitride.

18. An IG window unit including a coating supported by a glass substrate, the coating from the glass substrate outwardly comprising at least the following:
a dielectric layer of Si 3 N 4 ;
a high index layer having a refractive index of at least 2.1;
another dielectric layer comprising silicon nitride;
a layer comprising zinc oxide;
an infrared (IR) reflecting layer comprising silver on the glass substrate, located over and directly contacting the layer comprising zinc oxide, wherein the coating includes only one IR reflecting layer;
an overcoat comprising (i) a layer comprising tin oxide and (ii) a layer comprising silicon nitride located over and contacting the layer comprising tin oxide;
wherein the IG unit has a visible transmission of at least 70%;
wherein the coating does not contain any titanium oxide based layer located over the IR reflecting layer; and
wherein the IG unit is configured to have, as viewed from an exterior of a building, a reflective a* value of from about −4 to 0 and a reflective b* value of from about −1 to +2.5.

Assignees

• Guardian Industries
• Guardian Glass Llc
• Centre Luxembourgeois De Rech Pour Le Verre Et La Ceramique S A (C R V C )

Inventors

• Lao Jingyu
• Lingle Philip J
• Boyce Brent
• Disteldorf Bernd
• Blacker Richard

Classifications

• B32B2255/28

  Multiple coating on one surface · CPC title

• C03C17/2453

  Coating containing SnO2 · CPC title

• C03C17/3652

  the coating stack containing at least one sacrificial layer to protect the metal from oxidation · CPC title

• C03C17/3634

  one layer at least containing carbon, a carbide or oxycarbide · CPC title

• C03C2217/256

  Ag · CPC title