Low-E matchable coated articles having absorber film and corresponding methods

Patent metadata

Field	Value
Publication number	US-10759693-B2
Application number	US-201916596632-A
Country	US
Kind code	B2
Filing date	Oct 8, 2019
Priority date	Jul 16, 2018
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

A low-E coating has good color stability (a low ΔE* value) upon heat treatment (HT). Thermal stability may be improved by the provision of an as-deposited crystalline or substantially crystalline layer of or including zinc oxide, doped with at least one dopant (e.g., Sn), immediately under an infrared (IR) reflecting layer of or including silver; and/or by the provision of at least one dielectric layer of or including an oxide of zirconium. These have the effect of significantly improving the coating's thermal stability (i.e., lowering the ΔE* value). An absorber film may be designed to adjust visible transmission and provide desirable coloration, while maintaining durability and/or thermal stability. The dielectric layer (e.g., of or including an oxide of Zr) may be sputter-deposited so as to have a monoclinic phase in order to improve thermal stability.

First claim

What is claimed is:

1. A coated article including a coating on a glass substrate, wherein the coating comprises:
a first crystalline or substantially crystalline layer comprising zinc oxide doped with from about 1-30% Sn (wt. %), provided on the glass substrate;
a first infrared (IR) reflecting layer comprising silver located on the glass substrate and directly over and contacting the first crystalline or substantially crystalline layer comprising zinc oxide doped with from about 1-30% Sn;
wherein no silicon nitride based layer is located directly under and contacting the first crystalline or substantially crystalline layer comprising zinc oxide doped with from about 1-30% Sn;
at least one dielectric layer having monoclinic phase and comprising an oxide of zirconium;
wherein the at least one dielectric layer having monoclinic phase and comprising the oxide of zirconium is located: (1) between at least the glass substrate and the first crystalline or substantially crystalline layer comprising zinc oxide doped with from about 1-30% Sn (wt. %), and/or (2) between at least the first IR reflecting layer comprising silver and a second IR reflecting layer comprising silver of the coating;
an absorber film including a layer comprising silver, wherein a ratio of a physical thickness of the first IR reflecting layer comprising silver to a physical thickness of the layer comprising silver of the absorber film is at least 5:1, and wherein the layer comprising silver of the absorber film does not directly contact the first IR reflecting layer; and
wherein the coated article is configured to have, measured monolithically, at least two of: (i) a transmissive ΔE* value of no greater than 3.0 upon a reference heat treatment for 12 minutes at a temperature of about 650 degrees C., (ii) a glass side reflective ΔE* value of no greater than 3.0 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C., and (iii) a film side reflective ΔE* value of no greater than 3.5 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C.

2. The coated article of claim 1 , wherein the absorber film further comprises a layer comprising an oxide of Ni and/or Cr located over and directly contacting the layer comprising silver of the absorber film.

3. The coated article of claim 1 , wherein the absorber film is located over the first IR reflecting layer, so that the first IR reflecting layer is located between at least the absorber film and the glass substrate.

4. The coated article of claim 1 , wherein the ratio of the physical thickness of the first IR reflecting layer comprising silver to the physical thickness of the layer comprising silver of the absorber film is at least 8:1.

5. The coated article of claim 1 , wherein the ratio of the physical thickness of the first IR reflecting layer comprising silver to the physical thickness of the layer comprising silver of the absorber film is at least 10:1.

6. The coated article of claim 1 , wherein the ratio of the physical thickness of the first IR reflecting layer comprising silver to the physical thickness of the layer comprising silver of the absorber film is at least 15:1.

7. The coated article of claim 1 , wherein the layer comprising silver of the absorber film is less than 60 Å thick.

8. The coated article of claim 1 , wherein the layer comprising silver of the absorber film is less than 30 Å thick.

9. The coated article of claim 1 , wherein the layer comprising silver of the absorber film is less than 15 Å thick.

10. The coated article of claim 1 , wherein the coated article is configured to have, measured monolithically, all three of: (i) a transmissive ΔE* value of no greater than 3.0 upon a reference heat treatment for 12 minutes at a temperature of about 650 degrees C., (ii) a glass side reflective ΔE* value of no greater than 3.0 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C., and (iii) a film side reflective ΔE* value of no greater than 3.5 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C.

11. The coated article of claim 1 , wherein the at least one dielectric layer comprising monoclinic phase is located at least between at least the glass substrate and the first crystalline or substantially crystalline layer comprising zinc oxide doped with from about 1-30% Sn (wt. %).

12. The coated article of claim 1 , wherein the at least one dielectric layer comprising monoclinic phase is located at least between at least the first IR reflecting layer comprising silver and the second IR reflecting layer comprising silver of the coating.

13. The coated article of claim 1 , wherein the first crystalline or substantially crystalline layer comprising zinc oxide is doped with from about 1-20% Sn (wt. %).

14. The coated article of claim 1 , wherein the first crystalline or substantially crystalline layer comprising zinc oxide is doped with from about 5-15% Sn (wt. %).

15. The coated article of claim 1 , wherein the first crystalline or substantially crystalline layer comprising zinc oxide doped with Sn is crystalline or substantially crystalline as sputter-deposited.

16. The coated article of claim 1 , wherein the coated article is configured to have, measured monolithically, all of: (i) a transmissive ΔE* value of no greater than 2.5 upon a reference heat treatment for 12 minutes at a temperature of about 650 degrees C., (ii) a glass side reflective ΔE* value of no greater than 2.5 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C., and (iii) a film side reflective ΔE* value of no greater than 3.0 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C.

17. The coated article of claim 1 , wherein the coated article is configured to have, measured monolithically, at least two of: (i) a transmissive ΔE* value of no greater than 2.3 upon a reference heat treatment for 16 minutes at a temperature of about 650 degrees C., (ii) a glass side reflective ΔE* value of no greater than 2.0 upon the reference heat treatment for 16 minutes at a temperature of about 650 degrees C., and (iii) a film side reflective ΔE* value of no greater than 3.0 upon the reference heat treatment for 16 minutes at a temperature of about 650 degrees C.

18. The coated article of claim 1 , wherein said coating has a sheet resistance (R s ) of no greater than 10 ohms/square.

19. The coated article of claim 1 , wherein said coated article, measured monolithically, has a visible transmission of at least 40%.

20. The coated article of claim 1 , wherein the coating as deposited further comprises a first amorphous or substantially amorphous layer comprising zinc stannate located on the glass substrate over at least the first IR reflecting layer comprising silver.

21. The coated article of claim 20 , wherein the first amorphous or substantially amorphous layer comprising zinc stannate has a metal content of from about 40-60% Zn and from about 40-60% Sn (wt. %).

22. The coated article of claim 1 , wherein the at least one dielectric layer comprising monoclinic phase may be configured to have a monoclinic peak thereof reduce upon said reference heat treatment.

23. The coated article of claim 1 , wherein the coating further comprises:
a second IR reflecting layer comprising silver located on the glass substrate over at least the first IR reflecting layer comprising silver,
a second cryst

Assignees

• Guardian Glass Llc

Inventors

• Xu Yongli
• Boyce Brent
• Boussaad Salah
• Lingle Philip J
• Lao Jingyu
• Vernhes Richard

Classifications

• C03C2218/156

  by magnetron sputtering · CPC title

• C03C2217/23

  Mixtures · CPC title

• C03C2217/22

  ZrO2 · CPC title

• C03C17/3681

  the multilayer coating being used in glazing, e.g. windows or windscreens · CPC title

• C03C17/3642

  the multilayer coating containing a metal layer · CPC title