Abstract
Tribological behavior of TiAl–multilayer graphene–Ag composites (TMACs) prepared by spark plasma sintering against a Si3N4 ball was investigated on a ball-on-disk high-temperature tribometer at different test temperatures and sliding speeds in this study. The test results showed that TMACs had the lower friction coefficient and less wear rate at 450 °C–0.25 m/s, which was attributed to the formation of the high-strength and intact tribofilms on worn surface. At 450 °C–0.25 m/s, during the sliding process, multilayer graphene (MLG) was ground out to form the high-strength skeletons on the worn surface of TMACs. Ag was migrated from the worn surface and combined with the MLG skeleton to form the high-strength and intact tribofilms. The high-strength and intact tribofilms were beneficial to lowering the friction coefficient for the lubricating effect of Ag and decreasing wear rate for the enhancing effect of MLG skeleton.
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Acknowledgements
This work is supported by the National Natural Science Foundation of China (51275370); Self-determined and Innovative Research Funds of WUT (135204008); the Fundamental Research Funds for the Central Universities (2016-YB-017 and 2016-zy-014). Authors are 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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Jia-Liang Zou and Kang Yang have contributed equally to this work.
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Zou, JL., Shi, XL., Shen, Q. et al. Tribological Behavior of TiAl–Multilayer Graphene–Ag Composites at Different Temperatures and Sliding Speeds. Acta Metall. Sin. (Engl. Lett.) 30, 193–200 (2017). https://doi.org/10.1007/s40195-017-0533-3
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DOI: https://doi.org/10.1007/s40195-017-0533-3