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-zirconium alloy or only zircon and includes an outer multilayered-cover layer consisting of alternating TiAlN and AlTiN layers, which has been applied by PVD.

2. The protective coating system as claimed in claim 1, wherein the sub-layer comprises a diffusion layer.

3. The protective coating system as claimed in claim 1, wherein the substrate is steel.

4. A compressor blade component, comprising: a substrate; and a protective coating system, wherein the protective coating system comprises a bottom sub-layer wherein the bottom sub-layer is an aluminiferous or zirconiferous sub-layer, wherein the bottom sub-layer comprises only aluminum or an aluminum-zirconium alloy or only zircon, and wherein the protective coating system comprises an outer multilayered cover layer consisting of alternating TiAlN and AlTiN layers, which has been applied by PVD.

5. The compressor blade 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 compressor blade component as claimed in claim 4, in which the sub-layer comprises a diffusion layer.

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

8. A method comprising: providing a substrate, wherein the substrate is a compressor blade; applying a sub-layer to the substrate, wherein the sub-layer is an aluminiferous or zirconiferous sub-layer and comprises only aluminum or an aluminum-zirconium alloy or only zircon; and applying an outer multilayered cover layer consisting of alternating TiAlN and AlTiN layers on top of the sub-layer, wherein the outer multilayered cover layer is applied by PVD.

Description

BRIEF DESCRIPTION

(1) Some of the embodiments will be described in detail, with references to the following FIGURES, wherein like designations denote like members, wherein:

(2) 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

(3) A component 1 with the protective coating system 20 has a metallic substrate 4.

(4) However, a substrate 4 can also consist of CMC or CFK.

(5) 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.

(6) 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.

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

(8) The sub-layer 7 exists at least partially as a diffusion layer.

(9) A TiAlN layer 11 and an AlTiN layer 12 are applied as the outermost layer.

(10) Multiple layers consisting of TiAlN-layers 11, 11′ and AlTiN-layers 12, 12′ are applied alternately.

(11) Only TiAlN and AlTin are used.

(12) 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.

(13) 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.