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Microstructural characterization of nanostructured supersonic sprayed Ni–Sn coatings after wear tests at elevated temperature

Abstract The paper presents results of the wear behavior, as well as the microstructural (scanning and transmission electron microscopy) and compositional (microanalysis with using energy dispersive and X-ray photon emission spectroscopy) characterization of nanostructured Ni-20Sn (wt.%) coatings, deposited on an Inconel 718 substrate by supersonic cold gas spraying at different spraying parameters. Coatings were examined in the as-deposited state and after testing in a linearly reciprocating sliding wear test at room temperature, 200, 400 and 550 °C. It was found that the Ni–Sn coatings exhibit superior wear resistance compared to benchmark materials. This is attributed to an appropriate balance of soft (Ni) and to hard (Ni3Sn – intermetallic) phases and to the nanostructure of the matrix, as well as to the presence of an NiO oxide tribo-layer, as revealed by the microanalysis and electron microscopy.