Friction and Wear Mechanism of $ MoS_{2} $/C Composite Coatings Under Atmospheric Environment

Abstract Tribological properties of $ MoS_{2} $/C coatings with different carbon contents (44.7–84.3 at.%) deposited by magnetron sputtering were systematically investigated under atmospheric environment. During tribological tests, the coating with the least $ MoS_{2} $ content exhibited the lowest...
Ausführliche Beschreibung

Abstract Tribological properties of $ MoS_{2} $/C coatings with different carbon contents (44.7–84.3 at.%) deposited by magnetron sputtering were systematically investigated under atmospheric environment. During tribological tests, the coating with the least $ MoS_{2} $ content exhibited the lowest friction coefficient and wear rate, while coating with the most $ MoS_{2} $ showed the worst performance. To understand friction and wear mechanism, multiple analytical tools such as SEM, EDS, Raman, XPS and TEM were applied to investigate the composition and structure. TEM and SEM characteristics proved that the tribofilm with multilayered structure was formed on the tribopair. The C-rich layer adhered to the tribopair and the top layer was well-ordered $ MoS_{2} $ tribofilm, and the dominated amorphous $ MoS_{2} $ was found between the two layers. It suggested that the shear plane was mainly made of well-ordered $ MoS_{2} $ transfer film, while carbon improved the mechanical properties of the coatings, served as a lubricant and also inhibited the oxidation of $ MoS_{2} $. Ausführliche Beschreibung