Composition versus friction and wear behavior of plasma sprayed WC-(W,Cr)2C-Ni/Ag/BaF2-CaF2 self-lubricating composite coatings for use up to 600 °C

► WC-(W,Cr)2C-Ni/Ag/BaF2-CaF2 self-lubricating coatings can be used up to 600 °C. ► Optimum content of solid lubricants is 15 wt.% Ag and 15 wt.% eutectic. ► Solid lubricants can reduce friction coefficient (μ) over a wide temperature range. ► Wear volume of counterpart ball is closely related to μ and transfer film.