Dry Sliding Wear of TiAl-Graphene-Silver Composite at Elevated Temperatures.

The dry sliding friction and wear behaviors of TiAl matrix self-lubricating composite (TMSC) containing multilayer graphene (MLG), silver (Ag) and MLG-Ag sliding against SiN balls from 25 to 750 °C were comparatively studied in this paper. The results suggested that TMSC containing MLG-Ag (TMA) showed better tribological properties over the wide temperature range, if compared to TMSC only containing MLG or Ag. Moreover, TMA exhibited the lower fiction coefficient and the less wear rate at 450 °C, which was attributed to the formation of intact lubricating films containing MLG and Ag on the worn surface. Furthermore, in the formed lubricating films, Ag worked as the solid lubricant to provide good lubricating effect, while MLG with high strength played the active role in enhancing the anti-rupture ability of lubricating films. The study indicated that TMA obtained the excellent tribological performance at 450 °C due to the remarkable synergistic effect of MLG and Ag. [ABSTRACT FROM AUTHOR]