Trans Tech Publications; Trans Tech Publications LtdAgüero, AlinaSpiradek, KrystinaHöfinger, SGutiérrez del Olmo, MarcosMuelas Gamo, Raúl2025-12-012025-12-012008-09-15Materials Science Forum 595-598: 251-259https://www.scientific.net/MSF.595-598.251https://hdl.handle.net/20.500.12666/1540Slurry iron aluminide coatings are very resistant to steam oxidation at 600-650º C. These coatings can be used to protect new generation Ultra Super Critical (USC) steam power plant ferritic/martensitic steel components. The microstructure of the initially deposited coating changes as a function of time, mainly due to coating-substrate interdiffusion, going from mostly Fe2Al5 to FeAl, causing the precipitation of AlN in those substrates containing a minimum content of N and moreover, developing Kirkendall porosity at the coating-substrate interface. Steam oxidation at 650º C causes the formation of a protective thin layer of hexagonal χ-Al2O3 phase along with some α- and γ-Al2O3 after the first few hours of exposure. However, despite the relatively low temperature, and after several thousands hours the protective layer was mostly composed of α-Al2O3. A study of the evolution of the microstructure of slurry aluminide coatings deposited on P92 and exposed to steam at 650º C has been carried out by scanning and transmission electron microscopy and X ray diffraction.engAluminide CoatingsSteam OxidationHigh Temperatureinfo:eu-repo/semantics/article10.4028/www.scientific.net/msf.595-598.251info:eu-repo/semantics/restrictedAccess