Method for coating a metallic surface

Patent metadata

Field	Value
Publication number	US-2019360106-A1
Application number	US-201916417743-A
Country	US
Kind code	A1
Filing date	May 21, 2019
Priority date	May 23, 2018
Publication date	Nov 28, 2019
Grant date	—

Abstract

The invention relates to a method for providing a metallic surface with a coating by applying one or more layers of one or more metal-containing slips to the surface. At least one of the slips comprises a coloring and/or color-imparting substance which has no influence on the properties of the completed coating and/or can be decomposed by thermal treatment, and the local thickness of the applied slip layer is determined on the basis of the local color intensity of the layer.

First claim

What is claimed is:

1 . A method for providing a metallic surface with a coating by applying one or more layers of one or more metal-containing slips to the surface, wherein at least one of the one or more slips comprises at least one coloring and/or color-imparting substance which has no influence on the properties of the completed coating and/or can be decomposed by thermal treatment, and the local thickness of an applied slip layer is determined on the basis of a local color intensity of the layer.

2 . The method of claim 1 , wherein the metallic surface is that of a component of a turbomachine.

3 . The method of claim 1 , wherein the metallic surface comprises or consists of a nickel-based, cobalt-based and/or iron-based alloy.

4 . The method of claim 1 , wherein at least one metal-containing slip comprises aluminum and/or an aluminum alloy.

5 . The method of claim 1 , wherein at least one metal-containing slip comprises particles of aluminum and of AlSi and/or AlY.

6 . The method of claim 1 , wherein the at least one coloring and/or color-imparting substance comprises at least one metal-containing pigment.

7 . The method of claim 6 , wherein the at least one coloring and/or color-imparting substance comprises one or more metal oxides.

8 . The method of claim 1 , wherein the at least one coloring and/or color-imparting substance comprises at least one organic dye.

9 . The method of claim 8 , wherein the at least one organic dye can be decomposed thermally with loss of its color.

10 . The method of claim 8 , wherein the at least one organic dye comprises an azo pigment.

11 . The method of claim 1 , wherein the at least one coloring and/or color-imparting substance comprises at least one substance which upon irradiation with UV and/or IR rays results in coloration of the slip.

12 . The method of claim 1 , wherein at least one of the one or more metal-containing slips comprises a flatting agent.

13 . The method of claim 12 , the flatting agent comprises silica gel.

14 . The method of claim 1 , wherein two or more slip layers are applied and before one layer is applied to a layer that has already been applied, the layer that has already been applied is optionally dried.

15 . The method of claim 14 , wherein the first layer is formed with a slip which comprises the at least one coloring and/or color-imparting substance, and atop the first layer a second layer is applied of a slip which comprises no coloring and/or color-imparting substance.

16 . The method of claim 15 , wherein one or more further slip layers are applied to the second layer, with alternation between slips with coloring and/or color-imparting substance and slips without coloring and/or color-imparting substance.

17 . The method of claim 1 , wherein a determination of the local color intensity of the applied slip layer comprises a comparison with calibrated specimen color tables and/or a measurement with one or more photosensors.

18 . The method of claim 1 , wherein one or more slips are applied by manual spraying.

19 . The method of claim 1 , wherein a coated area of the metallic substrate is at least 4 cm 2 in size.

20 . A metal-containing slip for producing a coating by the method of claim 1 , wherein the slip comprises at least one coloring and/or color-imparting substance in a concentration which allows the local thickness of a layer of the slip applied to the metal surface to be determined and/or assessed visually and/or by technical means on the basis of the local color intensity of the layer.

Assignees

• MTU Aero Engines AG

Inventors

• Pillhoefer Horst
• Morant Max
• Lautenbacher Philipp
• Hilser Ludwig

Classifications

• C23C28/021 Primary

  including at least one metal alloy layer · CPC title

• C23C10/20

  only one element being diffused · CPC title

• B05D2202/00

  Metallic substrate · CPC title

• C23C10/18

  using liquids, e.g. salt baths, liquid suspensions · CPC title

• C23C22/50

  Treatment of iron or alloys based thereon · CPC title