Abstract
The structure of oxides formed on the surface of NiCrAlY (AMDRY 962) powders plasma sprayed and captured in water was studied. Results of TEM have shown that these oxides were not amorphous but crystallic structures. All the investigated oxides, quite independent on the chemical composition, had spinel structures with spacings close to those of γ-Al₂O₃. Inhomogeneous thermal conditions due to the effect of plasma beam are assumed to be responsible for slight lattice distortions of oxides and superlattice reflexions caused by cation ordering. No transformations to the thermodynamically stable α-Al₂O₃ were observed.

Key words
NiCrAlY (AMDRY 962) powders, plasma sprayed, transformations, slight lattice distortions

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