Process for producing a high-temperature protective coating

Patent metadata

Field	Value
Publication number	US-9932661-B2
Application number	US-201414259331-A
Country	US
Kind code	B2
Filing date	Apr 23, 2014
Priority date	Apr 24, 2013
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

Disclosed is a process for producing a high-temperature protective coating for metallic components, in particular components of turbomachines which are subjected to thermal loading. The process comprises producing a slip from MCrAlY powder, in which M is at least one metal, and from a Cr powder, applying the slip to the component to be coated and subsequently alitizing the component provided with the slip.

First claim

What is claimed is:

1. A process for producing a high-temperature protective coating for metallic components, wherein the process comprises:
producing a slip comprising (i) a powder of Cr metal and (ii) a powder of MCrAlY alloy, in which M represents at least one metal;
applying the slip to the component to be coated; and
alitizing the component provided with the slip.

2. The process of claim 1 , wherein a weight ratio of (i) and (ii) is not higher than 10.

3. The process of claim 2 , wherein the weight ratio of (i) and (ii) is not higher than 3.

4. The process of claim 2 , wherein the weight ratio of (i) and (ii) is from 0.001 to 10.

5. The process of claim 2 , wherein (i) has a maximum grain size and/or a mean grain size of less than or equal to 10 μm, (ii) has a maximum grain size and/or a mean grain size of less than or equal to 10 μm, M represents one or more of Fe, Co and Ni, the slip comprises water and/or at least one liquid organic compound, and at least two layers of slip are applied in succession.

6. The process of claim 1 , wherein (i) has a maximum grain size of not more than 20 μm.

7. The process of claim 6 , wherein (ii) has a maximum grain size of not more than 20 μm.

8. The process of claim 1 , wherein (i) has a mean grain size of not more than 20 μm.

9. The process of claim 8 , wherein (ii) has a mean grain size of not more than 20 μm.

10. The process of claim 1 , wherein M represents one or more of Fe, Co and Ni.

11. The process of claim 1 , wherein the slip comprises water and/or at least one liquid organic compound.

12. The process of claim 11 , wherein the liquid organic compound comprises an oil.

13. The process of claim 1 , wherein at least two layers of slip are applied in succession.

14. The process of claim 13 , wherein drying in vacuo and/or in ambient atmosphere and/or diffusion annealing is carried out after each application of a layer of slip.

15. The process of claim 1 , wherein at least two layers of slip of differing composition are applied.

16. The process of claim 15 , wherein the at least two layers comprise different proportions of (i).

Assignees

• MTU Aero Engines AG

Inventors

• Walter Heinrich

Classifications

• Y10T428/12063

  Nonparticulate metal component · CPC title

• C23C24/087

  Coating with metal alloys or metal elements only · CPC title

• C23C10/48

  Aluminising · CPC title

• C23C10/30

  using a layer of powder or paste on the surface (using liquid suspensions of solids C23C10/18) · CPC title

• C23C10/52

  more than one element being diffused in one step · CPC title