Abstract
This study aims to identify whether mechanical surface treatment can improve the properties of thermal spray coatings for use in fuel-lubricated sliding conditions. In this study, we investigated the effects of ultrasonic nanocrystal surface modification (UNSM) technology on thermally sprayed chromium oxide (Cr2O3) and chromium carbide-nickel chromium (Cr3C2–NiCr) coatings and the resulting changes in sliding wear in fuels and scratch resistance. The improvement in coefficient of friction (COF) and specific wear rate (SWR) of the coatings after UNSM treatment was attributed to the reduced surface roughness, increased surface hardness, and the formation of tribo-layers (oxide) having lower shear strength with good lubricating properties. The wear mechanisms of the coatings involved plastic deformation leading to abrasive and oxidation modes.
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