Outboard durable transparent conductive coating on aircraft canopy

• US 9,309,589 B2
• Filed: 06/21/2011
• Issued: 04/12/2016
• Est. Priority Date: 06/21/2011
• Status: Active Grant

• Current Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: Uprety, Krishna, Bimanand, Alexander, Lakdawala, Khushroo H.
• Primary Examiner(s): Khatri, Prashant J
• Application Number:
  US13/165,680
• Publication Number:
  US 20120328859A1
• Time in Patent Office: 1,757 Days
• US Class Current: 1/1
• CPC Class Codes: B32B 7/02 Physical, chemical or physicochemical properties
• CPC Class Codes: B64C 1/1476 Canopies; Windscreens or similar transparent elements
• CPC Class Codes: C03C 17/42 at least one coating of an organic material and at least one non-metal coating
• CPC Class Codes: C23C 14/081 of aluminium, magnesium or beryllium
• CPC Class Codes: C23C 14/086 of zinc, germanium, cadmium, indium, tin, thallium or bismuth
• CPC Class Codes: C23C 14/205 by cathodic sputtering
• CPC Class Codes: C23C 14/35 by application of a magnetic field, e.g. magnetron sputtering C23C14/3457 takes precedence
• CPC Class Codes: H01B 1/023 Alloys based on aluminium
• CPC Class Codes: H01B 1/08 oxides
• 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
• CPC Class Codes: Y10T 428/31515 As intermediate layer
• CPC Class Codes: Y10T 428/31609 Particulate metal or metal compound-containing
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

A coated transparency including an electrically conductive multilayer stack is disclosed. The electrically conductive multilayer stack includes a first metal oxide layer including aluminum doped zinc (AZO), a metal layer including gold, and a second metal oxide layer including AZO. The electrically conductive multilayer stack has a low sheet resistance to provide radar attenuation and anti-static or static-dissipative properties, and has greater flexibility and resistance to corrosion than conventional multilayer stacks used to coat aircraft canopies and other substrates.

Claims

1. A coated transparency comprising:

a transparency; and

an electrically conductive multilayer stack comprising;

a first metal oxide layer comprising aluminum doped zinc oxide (AZO);

a metal layer consisting of gold, the metal layer being substantially free of silver; and

a second metal oxide layer comprising AZO,

wherein the first metal oxide layer is positioned over the transparency, the metal layer is positioned over the first metal oxide layer, and the second metal oxide layer is positioned over the metal layer, and

wherein the transparency is an aircraft canopy.

2. The coated transparency of claim 1, wherein the first metal oxide layer has a thickness in a range of about 10 to about 200 nm.

3. The coated transparency of claim 2, wherein the first metal oxide layer has a thickness in a range of greater than 20 to about 200 nm.

4. The coated transparency of claim 1, wherein the metal layer has a thickness in a range of about 5 to about 20 nm.

5. The coated transparency of claim 1, wherein the second metal oxide layer has a thickness in a range of about 10 to about 200 nm.

6. The coated transparency of claim 5, wherein the second metal oxide layer has a thickness in a range of greater than 20 to about 200 nm.

7. The coated transparency of claim 1, wherein the electrically conductive multilayer stack is transparent.

8. The coated transparency of claim 1, wherein the electrically conductive multilayer stack has a visible light transmittance of at least about 65%.

9. The coated transparency of claim 1, further comprising a base layer positioned over the transparency, wherein the base layer is between the transparency and the electrically conductive multilayer stack.

10. The coated transparency of claim 9, wherein the base layer comprises a material selected from the group consisting of polyepoxides, polyacrylates, polyurethanes, polysiloxanes, and combinations thereof.

11. The coated transparency of claim 9, further comprising a tie layer positioned over the transparency, wherein the tie layer is between the transparency and the base layer.

12. The coated transparency of claim 1, further comprising a topcoat positioned over the electrically conductive multilayer stack.

13. The coated transparency of claim 12, wherein the topcoat comprises polyurethane.

14. The coated transparency of claim 12, wherein the topcoat is in direct physical contact with the second metal oxide layer.

15. The coated transparency of claim 12 further comprising a topcoat tie layer between the topcoat and the electrically conductive multilayer stack.

16. The coated transparency of claim 15, wherein the topcoat tie layer is electrically conductive.

17. A coated transparency comprising:

a transparency comprising an aircraft canopy;

an electrically conductive multilayer stack comprising;

a first metal oxide layer comprising aluminum doped zinc oxide (AZO);

a metal layer, the metal layer being substantially free of silver; and

a second metal oxide layer comprising AZO,

wherein the first metal oxide layer is positioned over the transparency, the metal layer is positioned over the first metal oxide layer, and the second metal oxide layer is positioned over the metal layer; and

a conductive layer in direct physical contact with the second metal oxide layer.

18. An aircraft canopy comprising:

a transparency; and

an electrically conductive multilayer stack comprising;

a first metal oxide layer comprising aluminum doped zinc oxide (AZO);

a metal layer, the metal layer being substantially free of silver; and

a second metal oxide layer comprising AZO,

wherein the first metal oxide layer is positioned over the transparency, the metal layer is positioned over the first metal oxide layer, and the second metal oxide layer is positioned over the metal layer.