METHOD FOR APPLYING A PROTECTIVE LAYER, COMPONENT COATED WITH A PROTECTIVE LAYER, AND GAS TURBINE COMPRISING SUCH A COMPONENT

摘要

The invention is directed to a method for applying a protective layer with a component part coated with a protective layer and gas turbine with a component part of this type. In the method, a MCrAlY-based bond layer (12) is applied to a base metal (11), the bond layer (12) is coated by overaluminizing with an Al diffusion layer (14), the Al diffusion layer (14) is subjected to abrasion treatment so that an outer build-up layer (14.2) is removed from the Al diffusion layer (14), and a ceramic thermal barrier coating (13) of yttria partially stabilized zirconia is applied to the remaining Al diffusion layer (14) so that a protective layer is produced which is resistant to high-temperature degradation by corrosion and erosion. According to the invention, the method achieves a protective layer with a good resistance to thermal fatigue and can nevertheless be carried out in a simple manner. This is achieved inter alia in that the ceramic thermal barrier coating (13) is applied to the remaining Al diffusion layer (14) by air plasma spraying.