Anti-wear coating
AssigneeMTU Aero Engines AG
InventorsThomas Uihlein, Wolfgang Eichmann, Falko Heutling, Annegret Brendel
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Abstract
The invention relates to an anti-wear coating, specifically for components which are subject to erosion under mechanical loading, in particular for gas turbine components, said coating comprising at least two different individual layers which preferably alternate with one another multiply and are applied to a surface of a component which is to be coated. The individual layers comprise a ceramic main layer (45, 46, 47, 48) and a quasi-ductile, non-metallic intermediate layer (41, 42, 43, 44).
Claims20
A component having a coating thereon, wherein the coating is an anti-wear coating and comprises at least two different individual layers which alternate, the at least two individual layers comprising a ceramic main layer A and a non-metallic intermediate layer B configured in such a way that energy is withdrawn from cracks which grow in a direction of the component by crack branching in layer B so that crack growth is slowed or stopped, one of the layers B being arranged directly on the component and one of the layers A being arranged at a surface of the coating, and wherein layer B at least one of
- comprises a material having preferential sliding planes which are arranged parallel to a surface of the component;
- is a multilayer system which comprises ceramic layers as well as layers comprising a material having preferential sliding planes which are arranged parallel to a surface of the component;
- comprises a ceramic material having pores deliberately introduced therein;
- comprises a ceramic material comprising deliberately introduced microcracks running parallel to a surface of the substrate;
- comprises a ceramic material comprising a deliberately introduced foreign phase.
A method of slowing or stopping microcrack formation in a component which is subject to erosion under mechanical stress, wherein the method comprises applying to a surface of the component an anti-wear coating comprising at least two different individual layers which alternate, the at least two individual layers comprising a ceramic main layer A and a non-metallic intermediate layer B configured in such a way that energy is withdrawn from cracks which grow in a direction of the component by crack branching in layer B so that crack growth is slowed or stopped, one of the layers B being arranged directly on the component and one of the layers A being arranged at a surface of the coating, and wherein layer B at least one of
- comprises a material having preferential sliding planes which are arranged parallel to a surface of the component;
- is a multilayer system which comprises ceramic layers as well as layers comprising a material having preferential sliding planes which are arranged parallel to a surface of the component;
- comprises a ceramic material having pores deliberately introduced therein;
- comprises a ceramic material comprising deliberately introduced microcracks running parallel to a surface of the substrate;
- comprises a ceramic material comprising a deliberately introduced foreign phase.
Dependencies are inferred from the claim text.