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

摘要

The invention relates to a method for applying a protective layer, to a component that is coated with a protective layer, and to a gas turbine comprising such a component. According to the method, a MCrAlY-based adhesive layer (12) is applied onto a base metal (11). The adhesive layer (12) is coated with an Al diffusion layer (14) by means of aluminization. The Al diffusion layer (14) undergoes an abrasive treatment such that an outer buildup layer (14.2) of the Al diffusion layer (14) is removed, and a ceramic heat-insulating layer (13) made of zirconium oxide that is partially stabilized with yttrium oxide is applied onto the remaining Al diffusion layer (14) such that a protective layer against high-temperature corrosion and high-temperature erosion is produced. According to the invention, the method should achieve a good thermal fatigue resistance of the protective layer but can be carried out in a simple manner. This is achieved, inter alia, in that the ceramic heat-insulating layer (13) is applied onto the remaining Al diffusion layer (14) by means of an atmospheric plasma spraying process.