Evaluation of tribological, oxidation and corrosion behavior of HVOF sprayed sustainable temperature-dependent carbon coating

Abstract

Abstract To abate frictional loss, advanced coatings are vital for piston rings, thick low friction environment-friendly carbon coatings have been deposited using HVOF spray (High Velocity Oxy-fuel) technique. The COF (Coefficient of Friction) was found in the range of 0.3 to 0.45 whereas the wearing range was about 45–150 μm during the tested conditions. After wear test at high temperature, the developed coating shows that micro-hardness was increased about 11.5%, 90% reduction in residual stress, COF decreases to about 50%, and wear decreases to about 70% under test conditions. The experimental result of the conducted corrosion test illustrates that the overall measured mass loss per unit area of the as deposited sample was decreased to be about 85.7% at an exposure time of 1 h, 63.6%, at an exposure time of 3 h, and 55% at an exposure time of 5 h.