Tribological Behaviors of NiAl-Ti_3SiC_2 Self-Lubricating Composites at Elevated Temperatures

摘要

The tribological behaviors of NiAl-Ti_3SiC_2 composites (NMC) against Si_3N_4 at elevated temperatures were investigated by carrying out dry sliding wear tests at the condition of 10 N-0.2 m/s. The results showed that NMC without Ti_3SiC_2 had a high friction coefficient and wear rate at elevated temperatures, and the addition of Ti_3SiC_2 could improve the hightemperature tribological properties. Both the friction coefficient and wear rate of NMC obviously decreased at 600 and 800℃ with the addition of Ti_3SiC_2. The excellent tribological behaviors of NMC with 5 wt% Ti_3SiC_2 at elevated temperatures implied that 5 wt% Ti_3SiC_2 could be the optimal content.