Friction and wear behavior of Ti_3SiC_2 composite ceramics with addition of MoS_2

The Ti3SiC2 composite ceramics with addition of 4wt% MoS2 were fabricated by hot press sintering(HP).The friction,wear characteristics and behaviors of Ti3SiC2 composite ceramics/GCr15 steel pairs under unlubricated and lubricated conditions were studied.The tribological tests were carried out under a load of 38N at a sliding speed of 400 r/min.It was found that the friction coefficients of Ti3SiC2 composite ceramics are about 0.176-0.283 under unlubricated condition and 0.062-0.134 under lubricated.While their wear rates are about 2.657μmm3·N-1·m-1 and 0.1968μmm3·N-1·m-1,respectively.The lowest friction coefficient and wear rate can be attributed to the presence of a frictional oxide film consisting of amorphous Ti,A1,Si,Fe and Cr oxides,which have a significant antifriction effect on the friction surfaces.