Tribological Characterization of NiAl Self-Lubricating Composites Containing V2O5 Nanowires
In order to improve the tribological properties of NiAl self-lubricating composites, V2O5 nanowires with average width of 39 nm were synthesized by hydrothermal method. Furthermore, NiAl self-lubricating composites containing V2O5 nanowires (NAV) were successfully fabricated using spark plasma sintering technique. The tribological characteristics and wear mechanisms of NAV were evaluated at different sliding speeds, counterface ball materials and elevated temperatures. The results revealed that the frictional properties of NAV improved slightly with adding V2O5 nanowires at room temperature if compared to NiAl self-lubricating composites without solid lubricant as investigated in previous studies, while the wear mechanisms of NAV change widely with the change of the counterface ball materials and sliding velocities. V2O5 nanowires showed a beneficial effect on tribological performance of NAV at high temperatures owing to the formation of the V2O5-enriched glaze film at temperatures above 700 °C, which acts as the lubricous and protective mask against the severe wear.
Keywordsmetal-matrix composite self-lubricating composites sliding wear wear mechanism
This work was supported by the Project for Science and Technology Plan of Wuhan City (2013010501010139) and the Key Project for Science and Technology Plan of Henan province (152102210119). Authors also wish to gratefully thank the Material Research and Testing Center of Wuhan University of Technology for their assistance. Authors were grateful to M.J. Yang, S.L. Zhao and W.T. Zhu in Material Research and Test Center of WUT for their kind help with EPMA and FESEM.
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