Abstract
In this paper, the DLC films were deposited on the AISI 304 stainless steel by unbalanced magnetron sputtering technology. The tribological properties of DLC/SiC and DLC/Si3N4 triob-pairs under different relative humidity from 30% to 90% were investigated by ball-on-disc tribometer with reciprocating mode. The results showed that moderate increase in relative humidity can effectively reduce the friction & wear of DLC/SiC and DLC/Si3N4 tribo-pairs as well as eliminate the fatigue wear. In terms of friction coefficients and wear rates, these values for DLC/SiC tribo-pair decrease as the increases of relative humidity reaching the lower values at relative humidity of 90%, which can be attributed to the reduction of hard particles and the formation of stable transfer films between the frictional interface. Since the existence of hard particles between the frictional interface, the DLC film exhibits obvious fatigue wear at the relative humidity of 30%, which mainly displays the severe plastic deformation, delamination and cracks on the wear trace; For wear scars of SiC and Si3N4, no cracks were found on the surface of Si3N4 wear scars; There are obvious cracks on the surface of SiC wear scar, and the direction of crack propagation shows almost perpendicular to the direction of reciprocating sliding, which can be ascribed to the lower compactness and fracture toughness compared to the Si3N4.
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