Combustion apparatus

• US 20100011775A1
• Filed: 06/10/2009
• Published: 01/21/2010
• Est. Priority Date: 07/17/2008
• Status: Active Grant

• Current Assignee: Rolls-Royce PLC (Rolls-Royce Holdings Plc)
• Original Assignee: Rolls-Royce PLC (Rolls-Royce Holdings Plc)
• Inventors: Garry, Ian M., Wybrow, Michael N.
• Granted Patent: US 8,661,826 B2
• Time in Patent Office: Days
• US Class Current: 60/752
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing
• CPC Class Codes: C23C 4/01 Selective coating, e.g. pattern coating, without pre-treatment of the material to be coated
• CPC Class Codes: C23C 4/02 Pretreatment of the material to be coated, e.g. for coating on selected surface areas
• CPC Class Codes: F23M 2900/05004 Special materials for walls or lining
• CPC Class Codes: F23R 2900/03042 Film cooled combustion chamber walls or domes
• CPC Class Codes: F23R 3/002 Wall structures F23R3/02 and F23R3/007 take precedence

Abstract

A coated turbine engine article having a first wall and a second wall, wherein the first wall has a shielding feature integral with the article and which inhibits entry of a coating material into an open passage extending between the first wall and the second wall when the coating material is directed towards the article using a line of sight process.

Claims

1. A method of coating a turbine engine article having a passage, the method comprising the steps of providing the article with an open passage and a shielding feature that does not completely block the passage, directing coating material towards the article using a line of sight process such that the shielding feature inhibits entry of the coating material into the open passage.

2. A method according to claim 1, wherein the line of sight process is plasma spraying.

3. A method according to claim 1, wherein the article has a first surface and a second surface, wherein the passage extends between the first surface and the second surface and the first surface has the shielding feature integral with the article.

4. A method according to claim 3, wherein the shielding feature is a projection having a face that extends away from the first wall, wherein the passage opens onto the face.

5. A method according to claim 4, wherein the opening of the passage is at a height along the face of the projection that is greater than the thickness of the coating deposited onto the article.

6. A method according to claim 5, wherein the face is at an angle of 90°

or less to the first wall.

7. A method according to claim 1, wherein the coating is deposited to a thickness in excess of 0.3 mm.

8. A method according to claim 1, wherein the coating is a thermal barrier coating.

14. A coated article according to claim 1, wherein the coating has a thickness in excess of 0.3 mm.

16. A coated article according to claim 3, wherein the article is a combustor tile.

9. A coated turbine engine article having a first surface and a second surface, wherein the first surface has a shielding feature integral with the article and which does not completely block an open passage and which inhibits entry of a coating material into the open passage extending between the first surface and the second surface when the coating material is directed towards the article using a line of sight process.

10. A coated article according to claim 9, wherein the shielding feature is a projection.

11. A coated article according to claim 10, wherein the projection has a face that extends away from the first surface and the passage opens onto the face.

12. A coated article according to claim 11, wherein the opening of the passage is at a height along the face of the projection that is greater than the thickness of the coating on the article.

13. A coated article according to claim 11, wherein the face is at an angle of 90°

or less to the first wall.

15. A coated article according to claim 9, wherein the coating is a thermal barrier coating.

17. A coated turbine engine article having a first wall and a second wall, wherein the first wall has a shielding feature integral with the article and which inhibits entry of a coating material into an open passage extending between the first wall and the second wall when the coating material is directed towards the article using a line of sight process wherein the shielding feature is a projection of pyramidical or conical form.

18. A coated article according to claim 17, wherein the tip of the pyramid or cone is attached to the article.

19. A coated article according to claim 17, wherein the projection has a base spaced apart from the article, wherein the base presents an equal or greater area than the area of the open passage where it opens onto the first face when viewed in the intended direction of the coating material.

20. A coated article according to claim 17, wherein the coating has a thickness in excess of 0.3 μ

m.

21. A coated article according to claim 17, wherein the coating is a thermal barrier coating.

22. A coated article according to claim 17, wherein the article is a combustor tile.