Synergetic lubricating effect of MoS_2 and Ti_3SiC_2 on tribological properties of NiAl matrix self-lubricating composites over a wide temperature range

摘要

NiAl matrix self-lubricating composites with MoS_2 and Ti_3SiC_2 lubricants were prepared by spark plasma sintering. The tribological behaviors of the NiAl-Ti_3SiC_2-MoS_2 composites against Si_3N_4 were investigated from room temperature to 800 ℃. The results showed that the composites exhibited excellent self-lubricating and anti-wear properties over a wide temperature range. At 400 ℃, the composites containing 5Ti_3SiC_2-5MoS_2 (wt.%) had a very low friction coefficient of about 0.13 and a low wear rate of 4.5 × 10~(-5) mm~3 N~(-1) M~(-1). MoS_2 played the main role of lubrication at low temperatures, while Ti_3SiC_2 was responsible for low friction at high temperatures. Ti_3SiC_2 and MoS_2 lubricants in the NiAl-Ti_3SiC_2-MoS_2 composites showed the excellent synergetic lubricating effect over a wide temperature range from room temperature to 800 ℃.