Coated article with low-E coating having protective doped silver layer for protecting silver based IR reflecting layer(s), and method of making same

Patent metadata

Field	Value
Publication number	US-10731244-B2
Application number	US-201916686223-A
Country	US
Kind code	B2
Filing date	Nov 18, 2019
Priority date	Mar 1, 2017
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

A coated article includes a low emissivity (low-E) coating supported by a glass substrate. The low-E coating includes at least one silver (Ag) based infrared (IR) reflecting layer(s) that is provided adjacent to and contacting at least one protective metallic or substantially metallic doped silver layer in order to improve chemical durability characteristics of the low-E coating. The silver based IR reflecting layer and adjacent protective doped silver layer are part of a low emissivity (low-E) coating, and may be sandwiched between at least transparent dielectric layers. A barrier layer including Ni and/or Cr may be provided over and directly contacting the protective doped silver layer in order to further improve durability of the low-E coating.

First claim

The invention claimed is:

1. A coated article including a coating supported by a glass substrate, the coating comprising:
a first dielectric layer on the glass substrate;
an metallic or substantially metallic infrared (IR) reflecting layer comprising silver on the glass substrate located over at least the first dielectric layer;
a protective layer comprising doped silver on the glass substrate located over and directly contacting the IR reflecting layer comprising silver;
a second dielectric layer on the glass substrate located over at least the first dielectric layer, the IR reflecting layer comprising silver, and the protective layer comprising doped silver; and
wherein metal content of the protective layer comprising doped silver comprises from 80-99.5% Ag and from 0.5 to 20% dopant, atomic %, where the dopant is one or more of: Zn, Ni, ZnAl, ZnSi, Cu, and combinations thereof.

2. The coated article of claim 1 , wherein metal content of the protective layer comprising doped silver comprises from 90-99% Ag and from 1 to 10% dopant, atomic %, where the dopant is one or more of: Zn, Ni, ZnAl, ZnSi, Cu, and combinations thereof.

3. The coated article of claim 1 , wherein metal content of the protective layer comprising doped silver comprises from 95-99% Ag and from 1 to 5% dopant, atomic %, where the dopant is one or more of: Zn, Ni, ZnAl, ZnSi, Cu, and combinations thereof.

4. The coated article of claim 1 , wherein the IR reflecting layer consists essentially of silver.

5. The coated article of claim 1 , wherein the IR reflecting layer is metallic.

6. The coated article of claim 1 , wherein the protective layer comprising doped silver is metallic or substantially metallic.

7. The coated article of claim 1 , wherein the coated article has a visible transmission of at least 50%.

8. The coated article of claim 1 , wherein the dopant comprises Ni, and wherein metal content of the protective layer comprising doped silver comprises from 80-99.5% Ag and from 0.5 to 20% Ni, atomic %.

9. The coated article of claim 1 , wherein the dopant comprises Zn and Cu, and wherein metal content of the protective layer comprising doped silver comprises from 80-99% Ag and from 0.5 to 10% of each of Zn and Cu, atomic %.

10. The coated article of claim 1 , wherein the coated article is thermally tempered.

11. The coated article of claim 1 , wherein the protective layer is at least 75 Å thinner than is the IR reflecting layer comprising silver.

12. The coated article of claim 1 , wherein the protective layer is from about 5-25 Å thick, and the IR reflecting layer comprising silver is from about 60-155 Å thick.

13. The coated article of claim 1 , wherein the first dielectric layer comprises silicon nitride.

14. A coated article including a coating supported by a glass substrate, the coating comprising:
a first dielectric layer on the glass substrate;
an metallic or substantially metallic infrared (IR) reflecting layer comprising silver on the glass substrate located over at least the first dielectric layer;
a protective layer comprising doped silver on the glass substrate located over and directly contacting the IR reflecting layer comprising silver;
a second dielectric layer on the glass substrate located over at least the first dielectric layer, the IR reflecting layer comprising silver, and the protective layer comprising doped silver;
wherein metal content of the protective layer comprising doped silver comprises from 80-99.5% Ag and from 0.5 to 20% Zn atomic %.

15. A coated article including a coating supported by a glass substrate, the coating comprising:
a first dielectric layer on the glass substrate;
an metallic or substantially metallic infrared (IR) reflecting layer comprising silver on the glass substrate located over at least the first dielectric layer;
a protective layer comprising Ag and Ni on the glass substrate located over and directly contacting the IR reflecting layer comprising silver;
a second dielectric layer on the glass substrate located over at least the first dielectric layer, the IR reflecting layer comprising silver, and the protective layer comprising doped silver; and
wherein the coating has a sheet resistance (R s ) of no greater than 11 ohms/square and a normal emissivity (E n ) of no greater than 0.2.

16. The coated article of claim 15 , wherein metal content of the protective layer comprises from 0.5 to 20% Ni.

17. The coated article of claim 15 , wherein the protective layer comprising Ag and Ni is metallic or substantially metallic.

Assignees

• Guardian Glass Llc

Inventors

• Lu Yiwei
• Boyce Brent
• Ding Guowen
• Jewhurst Scott
• Clavero Cesar
• Schweigert Daniel
• Zhang Guizhen
• Lee Daniel

Classifications

• C23C14/185

  by cathodic sputtering · CPC title

• C23C14/18 Primary

  on other inorganic substrates · CPC title

• C03C17/366 Primary

  Low-emissivity or solar control coatings · CPC title

• C03C17/3652

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

• C03C17/3647

  in combination with other metals, silver being more than 50% · CPC title