Abstract
The oxidation behaviour of a high velocity oxygen fuel (HVOF) sprayed MCrAlY coating at 1150 °C is studied. The rough coating surface shows site-specific oxidation: the oxides in the convex regions show duplex microstructure, consisting of outer (Ni,Co)(Cr,Al)2O4 and inner α-Al2O3; the oxides in the concave regions, however, show single-layered microstructure comprised of exclusive α-Al2O3. Diffusional analysis predicts that in order to form an exclusive α-Al2O3 scale the minimum Al concentration in the γ-phase matrix in the convex regions must be higher than that in the concave regions. The study provides new insight into oxidation of MCrAlY coatings.
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