Abstract
To understand the mechanisms of oxidation at different conditions, water-quenched and air-cooled Pt84:Al11:Cr3:Ru2 (at.%) samples were oxidised in air between 1150 and 1350°C, for up to 100h. Well-adhering and protective external α-Al2O3 scales, which are non-uniform in thickness, formed. Parabolic scaling kinetics were established, and Pt84:Al11:Cr3:Ru2 (at.%) exhibited slower scale growth rates and lower activation energies, compared to most other Pt-, Ni- and Fe-based superalloys. Mechanisms of α-Al2O3 growth were proposed to be mainly by inward diffusion of oxygen along the oxide grain boundaries, with some outward diffusion of aluminium ions along the short circuit paths, such as pores.
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