System and method for applying a metallic coating

Patent metadata

Field	Value
Publication number	US-11143042-B2
Application number	US-201515117626-A
Country	US
Kind code	B2
Filing date	Feb 11, 2015
Priority date	Feb 11, 2014
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

The present disclosure relates generally to a system and method for applying a metallic coating. A first metallic coating may be applied to a portion of a total surface of a part and a second metallic coating may be applied to substantially the total surface. The metallic coating may be applied to a vane cluster for use in a turbomachine.

First claim

What is claimed:

1. A method for application of a metallic coating to a vane cluster including at least two cluster vanes, the method comprising:
applying a first layer of metallic coating within a portion of a total surface of the at least two cluster vanes; and
applying a second layer of metallic coating to substantially the total surface of the at least two cluster vanes.

2. The method of claim 1 , wherein the first and second layers of metallic coating comprise a metallic bond coat.

3. The method of claim 1 , wherein the portion comprises a non-line of sight area of the total surface.

4. The method of claim 1 , wherein the applying a first layer step comprises applying the first layer of metallic coating within the portion of the total surface of the at least two cluster vanes using a contact metal deposition process.

5. The method of claim 4 , wherein the contact metal deposition process comprises an electro-spark deposition process.

6. The method of claim 5 , wherein the electro-spark deposition process utilizes an electrode and comprises:
applying a first voltage to the electrode;
applying a second voltage to at least one of the at least two cluster vanes, wherein the first voltage is greater than the second voltage; and

touching the electrode to the portion of the total surface of the at least two cluster vanes.

7. The method of claim 6 , wherein the second voltage comprises ground.

8. The method of claim 6 , further comprising rotating the electrode while touching the electrode to the portion of the total surface of the at least two cluster vanes.

9. The method of claim 6 , further comprising supplying a shielding gas to an area where the electrode touches portion of the total surface of the at least two cluster vanes.

10. The method of claim 6 , wherein the step of touching the electrode to the portion of the total surface of the at least two cluster vanes is performed until a predetermined thickness of the first layer of metallic coating is deposited.

11. A vane cluster including at least two cluster vanes and comprising a metallic coating formed according to the method of claim 5 .

12. The method of claim 1 , wherein the step of applying the second layer of metallic coating is performed using a process selected from the group consisting of: low pressure plasma spray, electron beam physical vapor deposition, air spray, and electron beam directed vapor deposition.

13. A vane cluster including at least two cluster vanes and comprising a metallic coating formed according to the method of claim 12 .

14. The method of claim 1 , wherein the first layer is disposed beneath the second layer.

15. A vane cluster including at least two cluster vanes and comprising a metallic coating formed according to the method of claim 14 .

16. A vane cluster including at least two cluster vanes and comprising a metallic coating formed according to the method of claim 1 .

17. A vane cluster comprising:
a cluster platform;
a cluster shroud;
at least two cluster vanes extending between the cluster platform and the cluster shroud and defining a total surface;
a first layer of metallic coating disposed within a portion of the total surface of the at least two cluster vanes; and
a second layer of metallic coating disposed on substantially the total surface of the at least two cluster vanes.

18. The vane cluster of claim 17 , wherein the metallic coating comprises a metallic bond coat.

19. The vane cluster of claim 17 , wherein the first layer of metallic coating is applied within the portion of the total surface of the at least two cluster vanes using an electro-spark deposition process.

20. The vane cluster of claim 17 , wherein the first layer is disposed beneath the second layer.

Assignees

• United Technologies Corp
• Raytheon Tech Corp

Inventors

• Whitman Giovanni
• Thayer Henry H
• Larson Gary J
• Lin Wangen
• Blankenship Donn

Classifications

• F01D5/288 Primary

  Protective coatings for blades · CPC title

• F05D2220/32

  in gas turbines · CPC title

• C23C4/134

  Plasma spraying · CPC title

• Y02T50/60

  Efficient propulsion technologies, e.g. for aircraft · CPC title

• C23C14/221

  Ion beam deposition (C23C14/46, C23C14/48 take precedence) · CPC title