Tribological performance of TiAl matrix self-lubricating composites containing Ag, Ti_3SiC_2 and BaF_2/CaF_2 tested from room temperatureto 600 ℃

摘要

Dry sliding tribological behaviors of TiAl matrix self-lubricating composites (TMSC) containing varying amounts of Ag, Ti_3SiC_2 and BaF_2/CaF_2 eutectic (BaF_2-38 wt.%CaF_2) (ATBC) with weight ratio of 1:1:1 against Si_3N_4 from room temperature (RT) to 600 ℃ at the condition of 10 N-0.234 m/s were experimentally studied. The results implied that the ATBC could improve friction-reducing and anti-wear ability of TMSC over an extreme range of operating temperatures, which was attributed to the synergetic effect of Ag, Ti_3SiC_2 and BaF_2/CaF_2 lubricants. In addition, TMSC containing 9 wt.% ATBC exhibited the best tribological properties over the wide temperature range from RT to 600 ℃.