▎ 摘　　要

Fe-Ni-based composites with Ni-coated reduced grapheme oxide (RGO)-MoS2 were fabricated by powder metallurgy technique, and their morphology, phase composition, and tribological properties at different temperatures were investigated systematically. Results showed that Fe-Ni-based composite with Ni-coated RGO-MoS2 possessed much more uniform and denser microstructure, and higher hardness than that with RGO-MoS2. Furthermore, Ni-coated RGO-MoS2 additive greatly allowed increasing the friction-reducing and wear-resistant properties, due to the reinforcing and lubricating effect new phase (Fe3W3C, CrxS1+x, etc.) and the improvement on interfacial compatibility between Ni-coated RGO-MoS2 and Fe-Ni matrix. In particular, as the content of Ni-coated RGO-MoS2 was 5wt%, the friction coefficient and wear rate of the corresponding composite was decreased nearly 50% and 75%, respectively. More importantly, Ni-coated RGO-MoS2 reinforced composite kept excellent tribological properties at elevated temperature. Its friction coefficient decreased firstly with the increased temperature from 25? to 400?, then increased slightly when the temperature increased to 600?. Besides, the wear rate was only 0.73-0.9x10(-4) mm(3)/Nm during the whole temperature range. This suggested that Ni-coated RGO-MoS2 was a promising additive of metallic-based composites suitable for high-temperature sliding condition.