SUBSTRATE HAVING AN INTERMEDIATE COATING AND A CARBON COATING

Abstract

Components suitable for chemically aggressive environments are disclosed, as well as methods for producing the components. One component may include a substrate having at least one surface having a layer system, which may include an amorphous carbon layer. The layer system may include at least one metallic intermediate layer which is arranged between the substrate and the amorphous carbon layer. The metallic intermediate layer may include titanium, a titanium alloy, nickel, or a nickel alloy. A two-layer bonding layer may be arranged between the at least one intermediate layer and the substrate and a first bonding layer composed of NiP. A second bonding layer composed of a nickel-chromium alloy or a nickel-vanadium alloy may also be present. The amorphous carbon layer may form an outer layer of the layer system facing away from the substrate and may comprise at least one amorphous hydrogen-containing carbon layer.

Claims

1. A component comprising a substrate having at least one surface which is provided with a layer system, where the layer system comprises at least one amorphous carbon layer, wherein the layer system further comprises at least one metallic intermediate layer which is arranged between the substrate and the at least one amorphous carbon layer, where the metallic intermediate layer includes titanium, a titanium alloy, nickel or a nickel alloy and furthermore a two-layer bonding layer, which is arranged between the at least one intermediate layer and the substrate, is present and a first bonding layer composed of NiP and on top of this a second bonding layer composed of a nickel-chromium alloy or a nickel-vanadium alloy are present, and wherein the at least one amorphous carbon layer forms an outer layer of the layer system facing away from the substrate and comprises at least one amorphous hydrogen-containing carbon layer.

2. The component as claimed in claim 1, wherein the at least one amorphous hydrogen-containing carbon layer comprises a doping element which is formed by a metal or a nonmetal.

3. The component as claimed in claim 1, wherein the amorphous hydrogen-containing carbon layer has a hydrogen content in the range from 10 to 25 at.-%.

4. The component as claimed in claim 1, wherein a total layer thickness (D) of the layer system is in the range from 2 m to 100 m.

5. The component as claimed in claim 1, wherein the substrate is formed by steel.

6. The component as claimed in claim 1, wherein the metallic intermediate layer is formed by a titanium-nickel alloy.

7. The use of a component as claimed in claim 1, wherein the component acts at least in a region of the layer system in combination with a friction partner in a chemically aggressive environment.

8. A process for producing a component as claimed in claim 1, comprising: depositing the at least one bonding layer; depositing the at least one metallic intermediate layer on the two-layer bonding layer; and depositing the at least one amorphous carbon layer comprising the at least one amorphous hydrogen-containing carbon layer on the at least one metallic intermediate layer.

9. The process as claimed in claim 8, wherein the two-layer bonding layer and/or the at least one metallic intermediate layer and/or the at least one amorphous carbon layer comprising the at least one amorphous hydrogen-containing carbon layer are deposited by means of PVD or PACVD.

10. The process as claimed in claim 8, wherein the at least one metallic intermediate layer and the two-layer bonding layer are deposited by electrochemical deposition and/or by thermal spraying and the at least one amorphous carbon layer comprising the at least one amorphous hydrogen-containing carbon layer is deposited by PVD or PACVD.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Examples of the disclosed components and their advantages will be described in more detail below with the aid of the accompanying figure. The size ratios in the figure do not correspond to the actual size ratios since the layers of the layer system are depicted individually and in simplified form in an exploded view. In the FIGURE:

[0039] FIG. 1 shows a partial sectional view of a component in which a surface of the substrate is provided with a layer system according to an embodiment of the disclosure.

DETAILED DESCRIPTION

[0040] FIG. 1 shows a partial sectional view of a component 100 which comprises a substrate 10 composed of steel and a layer system 14. A surface 12 of the substrate 10 is provided with the layer system 14 according to the disclosure, with a bonding layer 20 applied directly to the surface 12 of the substrate 10 being depicted here. The bonding layer 20 is only optionally present and is not absolutely necessary. Furthermore, a metallic intermediate layer 16 which has been applied directly to the surface 12 of the substrate 10 or to the bonding layer 20 which is optionally present is provided. Furthermore, an outer layer 18 in the form of a tribologically functional, amorphous hydrogen-containing carbon layer is present and is arranged facing away from the substrate 10. The metallic bonding layer in this embodiment consists of, for example, a nickel-vanadium alloy. However, the bonding layer can also be made up of a number of layers and, in particular, comprise a first bonding layer, for example composed of NiP, and a second bonding layer, for example composed of NiCr.

[0041] The metallic intermediate layer 16 preferably consists of titanium, a titanium alloy, nickel or a nickel alloy. Here, an intermediate layer 16 composed of a titanium-nickel-vanadium alloy is used. In the production of the layers of the layer system 14 by means of PVD or PACVD, it is possible to use individual targets or else mosaic targets. In one embodiment, the tribologically functional amorphous hydrogen-containing carbon layer is a modified hydrogen-containing amorphous carbon layer. The layer system 14 formed on the component 100 here has a total layer thickness D of 25 m.

[0042] The depicted embodiment of the component is merely an example of how the component of the disclosure and also the production process according to the disclosure can be configured. Thus, a bonding layer can be omitted entirely or a plurality of bonding layers of different compositions can be provided on the substrate. Furthermore, a plurality of metallic intermediate layers can be present. Finally, it is also possible for a plurality of amorphous carbon layers comprising at least one amorphous hydrogen-containing carbon layer to be present.

LIST OF REFERENCE SYMBOLS

[0043] 100 component [0044] 10 substrate [0045] 12 surface [0046] 14 layer system [0047] 16 metallic intermediate layer [0048] 18 outer layer [0049] 20 bonding layer [0050] 22 doping element [0051] D total layer thickness