MULTILAYERED ALUMINIFEROUS PROTECTIVE COATING AND COMPONENT

Abstract

The use of especially an aluminum alloy on a metal substrate in a PVD-AlTiN coating results in good corrosion and erosion protection.

Claims

1. A protective coating system, which has a bottom aluminiferous or zirconiferous sub-layer on a substrate, wherein the sublayer is at least one of directly on and in the substrate, wherein the sub-layer comprises only aluminum or an aluminum alloy or an aluminum-zirconium alloy or only zircon or a zirconium alloy and includes an outer multilayered, alternating cover layer at least consisting of TiAlN and AlTiN, which has been applied by PVD.

2. The protective coating system as claimed in claim 1, which comprises only one sub-layer, having only one aluminiferous sub-layer.

3. The protective coating system as claimed in claim 1, which comprises at least one double layer consisting of TiAlN and AlTiN, or multilayers consisting of TiAlN and AlTiN or only consisting of TiAlN and AlTiN.

4. A component, which has a coating system as claimed in claim 1, in which the material of a substrate of the component is metallic.

5. The component as claimed in claim 4, in which the sub-layer is at least one of arranged directly on and in the substrate.

6. The component as claimed in claim 4, in which the sub-layer is designed at least partially as a diffusion layer.

7. The component as claimed in claim 4, wherein the component is a compressor blade.

8. The component as claimed in claim 4, wherein the component is steel.

Description

BRIEF DESCRIPTION

[0017] Some of the embodiments will be described in detail, with references to the following FIGURES, wherein like designations denote like members, wherein:

[0018] The FIGURE shows a coating 20 according to embodiments of the invention, which is used especially in the case of compressor blades of turbines, particularly gas turbines.

DETAILED DESCRIPTION

[0019] A component 1 with the protective coating system 20 has a metallic substrate 4.

[0020] However, a substrate 4 can also consist of CMC or CFK.

[0021] The material of the substrate 4 is steel as is also used in the case of compressor blades of turbines, gas turbines or for compressors.

[0022] An aluminiferous or zirconiferous sub-layer 7 is applied directly to the surface 5 of the substrate 4. There is only one sub-layer 7.

[0023] The sub-layer 7 can comprise only aluminum (Al) or an aluminum alloy or an aluminum-zirconium alloy (AlZr) or only zircon (Zr) or a zirconium alloy.

[0024] The sub-layer 7 exists at least partially as a diffusion layer.

[0025] A TiAlN layer 11 and an AlTiN layer 12 are applied as the outermost layer.

[0026] Multiple layers consisting of TiAlN-layers 11, 11 and AlTiN-layers 12, 12 are applied alternately.

[0027] Only TiAlN and AlTin are used.

[0028] Although the invention has been illustrated and described in greater detail with reference to the preferred exemplary embodiment, the invention is not limited to the examples disclosed, and further variations can be inferred by a person skilled in the art, without departing from the scope of protection of the invention.

[0029] For the sake of clarity, it is to be understood that the use of a or an throughout this application does not exclude a plurality, and comprising does not exclude other steps or elements.