Oxidation of single crystal PWA 1483 at 950 °C in flowing air |
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| Authors: | A Pfennig B Fedelich |
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| Affiliation: | a FHTW University of Applied Sciences Berlin, Treskowalle 8, 10318 Berlin, Germany
b Federal Institute of Materials Research and Testing BAM, Unter den Eichen 87, 12205 Berlin, Germany |
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| Abstract: | The oxidation behaviour of single crystal PWA 1483 at 950 °C was investigated by means of XRD, SEM and EDS. The parabolic oxidation behaviour, as defined by mass gain and the respective oxide layer thicknesses, is characterized by a parabolic rate constant of about 4 × 10−6 mg2/(cm4 × s) and the formation of a multi-layered oxide scale. An outer scale contains a Ti-bearing thin film composed of TiO2 and NiTiO3 but mostly Cr in Cr2O3 and (Ni/Co)Cr2O4 besides NiTaO4. This outer scale is connected to a discontinuous layer of Al2O3 and an area of γ′-depletion within the base material. |
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| Keywords: | A Superalloys B Weight loss C Oxidation C High temperature corrosion C Kinetic parameters |
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