Substrates coated with a stack of thin layers having reflection properties in the infrared and/or with respect to solar radiation

• US 5,837,361 A
• Filed: 11/12/1996
• Issued: 11/17/1998
• Est. Priority Date: 11/10/1995
• Status: Expired due to Fees

• Current Assignee: Saint-Gobain Vitrage
• Original Assignee: Saint-Gobain Vitrage
• Inventors: Heinz, heiress, Ursula, Heinz, deceased, Bernhard, Glaser, Hans, Heinz, heir, Peter
• Primary Examiner(s): TURNER, ARCHENE A
• Application Number:
  US08/746,489
• Time in Patent Office: 735 Days
• Field of Search: 428/216, 428/336, 428/701, 428/702, 428/428, 428/432, 428/469, 428/472, 428/212, 359/580, 359/585, 359/588, 359/9, 427/162, 427/164
• US Class Current: 428/216
• CPC Class Codes: B32B 17/06 comprising glass as the main or only constituent of a layer, next to another layer of a specific material
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3618 Coatings of type glass/inorganic compound/other inorganic layers, at least one layer being metallic
• 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 17/3652 the coating stack containing at least one sacrificial layer to protect the metal from oxidation
• CPC Class Codes: C03C 17/366 Low-emissivity or solar control coatings
• CPC Class Codes: C03C 17/3681 the multilayer coating being used in glazing, e.g. windows or windscreens
• CPC Class Codes: C03C 2217/73 Anti-reflective coatings with specific characteristics
• CPC Class Codes: C03C 2217/78 Coatings specially designed to be durable, e.g. scratch-resistant
• CPC Class Codes: G02B 5/208 for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/24975 No layer or component greater than 5 mils thick
• CPC Class Codes: Y10T 428/265 1 mil or less

Abstract

A coated substrate comprises a transparent substrate, a lower coating on the transparent substrate, a functional layer on the lower coating, and an upper coating on the functional layer. The lower coating has a first layer comprising silicon or a metal, and nitrogen or oxygen, and a second layer comprising zinc oxide and having a thickness of at least 16 nm. The second layer is in contact with the functional layer.

Claims

1. A coated substrate, comprising:

(I) a transparent substrate;

(II) a lower coating on said transparent substrate, comprising;

(a) a first layer comprising (i) silicon or a metal and (ii) nitrogen or oxygen, and

(b) a second layer comprising zinc oxide and having a thickness of at least 16 nm;

(III) a functional layer on said lower coating; and

(IV) an upper coating comprising a dielectric material, on said functional layer;

wherein (b) said second layer is in contact with (III) said functional layer, and (III) said functional layer has been formed onto (b) said second layer.

2. The coated substrate of claim 1, wherein said functional layer has a thickness of 7 to 25 nm and comprises silver.

3. The coated substrate of claim 1, wherein said second layer has a thickness of 16 to 35 nm.

4. The coated substrate of claim 1, wherein said first layer has a thickness of 5 to 35 nm and comprises a member selected from the group consisting of bismuth oxide, tin oxide and silicon nitride.

5. The coated substrate of claim 1, further comprising (V) a sacrificial layer, on said functional layer comprising at least one member selected from the group consisting of niobium, titanium, tin, tantalum, a nickel-chromium alloy, a tantalum-chromium alloy and a niobium-chromium alloy.

6. The coated substrate of claim 5, wherein (V) said sacrificial layer has a thickness of 0.5 to 6 nm.

7. The coated substrate of claim 1, wherein said upper coating comprises at least one layer comprising at least one dielectric selected from the group consisting tin oxide, zinc oxide, niobium oxide, titanium oxide, tantalum oxide, bismuth oxide and silicon nitride.

8. The coated substrate of claim 1, wherein said upper coating comprises:

(c) a third layer having a thickness of 2 to 35 nm and comprising tin oxide; and

(d) a fourth layer having a thickness of 5 to 35 nm and comprising bismuth oxide, either on or under said third layer.

9. The coated substrate of claim 8, wherein:

(c) said third layer has a thickness of 5 to 25 nm; and

(d) said fourth layer has a thickness of 5 to 15 nm.

10. The coating substrate of claim 8, wherein said third layer is between said fourth layer and said functional layer.

11. The coating substrate of claim 8, wherein said fourth layer is between said third layer and said functional layer.

12. The coated substrate of claim 1, further comprising (VI) a protective layer, on said upper coating, having a thickness of 3 to 10 nm and comprising titanium oxide.

13. The coated substrate of claim 1, further comprising (VII) a second functional layer, on said upper coating.

14. The coated substrate of claim 1, further comprising (V) a sacrificial layer, on said functional layer, having a thickness of 0.5 to 6 nm and comprising at least one member selected from the group consisting of niobium, titanium, tin, tantalum, a nickel-chromium alloy, a tantalum-chromium alloy and a niobium-chromium alloy, and wherein:

said functional layer has a thickness of 7 to 25 nm and comprises silver;

said second layer has a thickness of 16 to 35 nm;

said first layer has a thickness of 5 to 35 nm and comprises a member selected from the group consisting of bismuth oxide, tin oxide and silicon nitride; and

said upper coating comprises at least one layer comprising at least one dielectric selected from the group consisting tin oxide, zinc oxide, niobium oxide, titanium oxide, tantalum oxide, bismuth oxide and silicon nitride.

15. A panel, comprising at least one coated substrate of claim 1.

16. The panel of claim 15, wherein said panel has an emissivity of at most 0.05 and a light transmission T_L of at least 75%.

17. The panel of claim 15, wherein said panel has a K factor according to DIN 52612 of approximately 1.1 W/m² K or a G factor according to DIN 67507 of 58 to 60%.

18. A panel, comprising at least one coated substrate of claim 8.

19. The panel of claim 18, wherein said panel has an emissivity of at most 0.05 and a light transmission T_L of at least 75%.

20. A method of making a coated substrate, comprising:

applying a lower coating on a transparent substrate, said lower coating comprising;

(a) a first layer comprising

(i) silicon or a metal, and (ii) nitrogen or oxygen, and

(b) a second layer comprising zinc oxide and having a thickness of at least 16 nm;

applying a functional layer on said lower coating; and

applying an upper coating comprising a dielectric material, on said functional layer;

wherein

said second layer is in contact with said functional layer; and

said functional layer has a thickness of 7 to 25 nm and comprises silver.

21. A coated substrate, comprising:

(I) a transparent substrate;

(II) a lower coating on said transparent substrate, comprising;

(a) a first layer comprising bismuth oxide; and

(b) a second layer comprising zinc oxide and having a thickness of at least 16 nm;

(III) a functional layer on said lower coating; and

(IV) an upper coating comprising a dielectric material, on said functional layer;

wherein (b) said second layer is in contact with (III) said functional layer.