Abstract
Abstract A new electron beam treatment method was applied to the surface of LPPS–MCrAlY coatings to improve the oxide scale behavior. The electron beam generated by the newly developed facility GESA has a diameter of about 10 cm and sufficient power density to melt a surface layer of about 20 μm of this area by just one electron beam pulse. Cooling rates are around 10 6 K/s and result in a nanometer grained single phase structure of the surface layer, that solidifies directionally. The high roughness of the as sprayed surface is reduced by the GESA process from R A =5 to 1.5 μm. The oxidation behavior of treated coatings at 950°C in air was examined. During oxidation a single phase α-alumina scale developed on the treated surface with a considerably lower growth rate as compared to the untreated coatings. Therefore, it is expected that electron beam treatment improves the oxidation resistance of MCrAlY coatings and their suitability as a bond coat for EBPVD thermal barrier coatings.
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