APPLIANCE TRANSPARENCY

• US 20090142602A1
• Filed: 06/06/2008
• Published: 06/04/2009
• Est. Priority Date: 06/13/2007
• Status: Active Grant

• Current Assignee: Vitro Flat Glass LLC (Compagnie De Saint-Gobain)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: Medwick, Paul A., Thiel, James P., Wagner, Andrew V.
• Granted Patent: US 8,728,634 B2
• Time in Patent Office: Days
• US Class Current: 428/428
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3613 Coatings of type glass/inorganic compound/metal/inorganic compound/metal/other
• CPC Class Codes: C03C 17/3639 Multilayers containing at least two functional metal layers
• CPC Class Codes: C03C 17/3642 the multilayer coating containing a metal layer
• CPC Class Codes: C03C 17/3644 the metal being silver
• CPC Class Codes: C03C 17/3649 made of metals other than silver
• CPC Class Codes: C03C 17/3657 the multilayer coating having optical properties
• CPC Class Codes: C03C 17/3686 the multilayer coating being used for ovens
• CPC Class Codes: C03C 17/3694 one layer having a composition gradient through its thickness
• CPC Class Codes: C03C 2218/365 Coating different sides of a glass substrate

Abstract

A transparency includes a substrate having a first major surface and a second major surface. A first coating is provided over at least a portion of the first major surface, the first coating including one or more metal oxide layers. A second coating is provided over at least a portion of the second major surface, the second coating including one or more metallic layers.

Claims

1. A transparency, comprising:

a substrate having a first major surface and a second major surface;

a first coating provided over at least a portion of the first major surface, the first coating comprising one or more metal oxide layers;

a second coating provided over at least a portion of the second major surface, the second coating comprising at least one dielectric layer and at least one metallic layer; and

a protective coating provided over the second coating.

2. The transparency of claim 1, wherein the first coating comprises a first coating layer and a second coating layer.

3. The transparency of claim 2, wherein the first coating layer comprises one or more oxides of one or more of Zn, P, Fe, Mn, Al, Ce, Sn, Sb, Hf, Zr, Ni, Zn, Bi, Ti, Co, Cr, Si or In or an alloy of any thereof.

4. The transparency of claim 2, wherein the first coating layer comprises a gradient layer.

5. The transparency of claim 4, wherein the first coating layer comprises a gradient layer comprising silica and tin oxide.

6. The transparency of claim 2, wherein the second coating layer comprises at least one doped metal oxide layer.

7. The transparency of claim 6, wherein the second coating layer comprises fluorine doped tin oxide.

8. The transparency of claim 1, wherein the second coating comprises one or more metallic layers selected from the group consisting of gold, copper, silver, aluminum, or mixtures, alloys, or combinations thereof.

9. The transparency of claim 1, wherein the at least one dielectric layer of the second coating includes at least one material selected from metal oxides, oxides of metal alloys, doped metal oxides, nitrides, oxynitrides, and mixtures thereof.

10. The transparency of claim 1, wherein the second coating comprises:

a first dielectric layer;

a first metallic layer deposited over the first dielectric layer;

a second dielectric layer deposited over the first metallic layer; and

a second metallic layer deposited over the second dielectric layer.

11. The transparency of claim 10, wherein the first dielectric layer comprises a zinc oxide film and a zinc stannate film.

12. The transparency of claim 10, wherein the second dielectric layer comprises a first zinc oxide film, a zinc stannate film deposited over the first zinc oxide film, and a second zinc oxide film deposited over the zinc stannate film.

13. The transparency of claim 10, including a third dielectric layer over the second metallic layer, the third dielectric layer comprising a first zinc oxide film, a zinc stannate film deposited over the first zinc oxide film, and a second zinc oxide film deposited over the zinc stannate film, and the second coating further includes a third metallic layer deposited over the third dielectric layer.

14. The transparency of claim 13, including a fourth dielectric layer deposited over the third metallic layer, wherein the fourth dielectric layer comprises at least one of a zinc stannate film and a zinc oxide film.

15. The transparency of claim 10, wherein the protective coating is deposited over the second metallic layer.

16. The transparency of claim 14, wherein the protective coating is deposited over the fourth dielectric layer.

17. The transparency of claim 1, wherein the protective coating comprises at least one metal oxide selected from titanium oxide, aluminum oxide, silicon oxide, and mixtures thereof.

18. The transparency of claim 1, wherein the protective coating comprises 15 wt. % to 70 wt. % alumina and 85 wt. % to 30 wt. % silica.

19. The transparency of claim 1, wherein the protective coating comprises a first layer and a second layer formed over the first layer, wherein the first layer comprises 50 wt. % to 100 wt. % alumina and 50 wt. % to 0 wt. % silica, and the second layer comprises a mixture of silica and alumina.

20. The transparency of claim 19, wherein the second layer comprises 70 wt. % to 100 wt. % silica and 30 wt. % to 0 wt. % alumina.

21. An oven transparency, comprising:

a glass substrate having a first major surface and a second major surface;

a first coating provided over at least a portion of the first major surface, the first coating comprising;

a first coating layer comprising a gradient layer comprising silica and tin oxide; and

a second coating layer comprising fluorine doped tin oxide; and

a second coating provided over at least a portion of the second major surface, the second coating comprising;

a first dielectric layer comprising a zinc stannate layer and a zinc oxide layer;

a first metallic layer over the first dielectric layer;

a second dielectric layer over the first metallic layer and comprising a zinc oxide layer, a zinc stannate layer, and another zinc oxide layer;

a second metallic layer over the second dielectric layer; and

a topcoat over the second metallic layer and comprising at least one of a zinc oxide layer or a zinc oxide layer and a zinc stannate layer; and

a protective coating over the topcoat.

22. The oven transparency of claim 21, wherein the protective coating comprises 15 wt. % to 70 wt. % alumina and 85 wt. % to 30 wt. % silica.

23. The oven transparency of claim 21, wherein the protective coating comprises a first layer and a second layer formed over the first layer, wherein the first layer comprises 50 wt. % to 100 wt. % alumina and 50 wt. % to 0 wt. % silica, and the second layer comprises a mixture of silica and alumina.