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.
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