# US 10,480,058 B2 · Coated article with low-E coating having protective doped silver layer for protecting silver based IR reflecting layer(s), and method of making same

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- Number: US 10,480,058 B2
- Document ID: US10480058B2
- Status: Granted
- Kind: B2
- Application number: 16/293,911
- Filed: 2019-03-06
- Published: 2019-07-04
- Granted: 2019-11-19
- Earliest claimed: 2017-03-01
- Assignees: Guardian Glass, LLC
- Applicants: Guardian Glass, LLC
- Inventors: Yiwei Lu; Brent Boyce; Guowen Ding; Scott Jewhurst; Cesar Clavero; Daniel Schweigert; Guizhen Zhang; Daniel Lee
- Web page: https://patentgrep.com/patent/US10480058B2

## CPC

- C23C 14/18: on other inorganic substrates
- C03C 17/34: with at least two coatings having different compositions (C03C17/44 takes precedence)
- C03C 17/36: at least one coating being a metal
- C03C 17/3639: {Multilayers containing at least two functional metal layers}
- C03C 17/3644: {the metal being silver}
- C03C 17/3652: {the coating stack containing at least one sacrificial layer to protect the metal from oxidation}
- C03C 17/366: {Low-emissivity or solar control coatings}
- C23C 14/185: {by cathodic sputtering}
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS

## 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.

## Claims

### Claim 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;
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, ZnSiCu, and combinations thereof; and
wherein the coating has a sheet resistance (Rs) of no greater than 11 ohms/square and a normal emissivity (En) of no greater than 0.2.

### Claim 2 (depends on 1)

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, ZnSiCu, and combinations thereof.

### Claim 3 (depends on 1)

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, ZnSiCu, and combinations thereof.

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 1)

The coated article of claim 1, wherein the coated article has a light-to-solar gain ratio (LSG) of at least 1.10.

### Claim 9 (depends on 1)

The coated article of claim 1, wherein the dopant comprises Zn, and wherein metal content of the protective layer comprising doped silver comprises from 90-99% Ag and from 1 to 10% Zn, atomic %.

### Claim 10 (depends on 1)

The coated article of claim 1, wherein the dopant comprises Zn, and wherein metal content of the protective layer comprising doped silver comprises from 95-99% Ag and from 1 to 5% Zn, atomic %.

### Claim 11 (depends on 1)

The coated article of claim 1, wherein the dopant comprises Ni, and wherein metal content of the protective layer comprising doped silver comprises from 90-99% Ag and from 1 to 10% Ni, atomic %.

### Claim 12 (depends on 1)

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 %.

### Claim 13 (depends on 1)

The coated article of claim 1, wherein the dopant comprises Zn and Si, 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 Si, atomic %.

### Claim 14 (depends on 1)

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

### Claim 15 (depends on 1)

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

### Claim 16 (depends on 1)

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

### Claim 17 (depends on 1)

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

### Claim 18 (depends on 1)

The coated article of claim 1, wherein the coating further comprises another infrared (IR) reflecting layer comprising silver that is spaced apart from and does not contact the protective layer comprising doped silver.

### Claim 19

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 %; and
wherein the coating has a sheet resistance (Rs) of no greater than 11 ohms/square and a normal emissivity (En) of no greater than 0.2.

### Claim 20

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% Ni, atomic %; and
wherein the coating has a sheet resistance (Rs) of no greater than 11 ohms/square and a normal emissivity (En) of no greater than 0.2.