Sliding friction and wear behaviors of surface-coated natural serpentine mineral powders as lubricant additive

This paper is devoted to investigate the friction and wear properties of surface-coated natural serpentine powders (SP) as oil additive. The worn surface was characterized and the formation mechanism of the tribofilm was discussed accordingly. Results indicate that the optimal of additive concentration and applied load exist in the tests. A tribofilm, which is responsible for the decrease in friction and wear, mainly with iron oxides, silicon oxides, graphite and organic compounds was found on the worn surface.