Abstract
Impregnated graphite has attracted considerable attention and has been widely used as an ideal friction material in many fields. However, the influence of the friction temperature on its tribological properties has not been clearly studied; furthermore, the evolution mechanism of transferred tribofilm is unknown. In this study, the tribological properties of impregnated graphite were investigated at different friction temperatures, and the evolution of the carbon-based tribofilm was also determined. The results revealed that the tribological properties significantly improved with an increase in friction temperature. The friction coefficient and wear depth of impregnated graphite reduced by 68% and 75%, respectively, at a high temperature of 160 °C compared with those of non-impregnated graphite. The significant properties of the impregnated graphite can be attributed to a transferred carbon-based tribofilm with an ordered structure induced by the friction temperature, which uniformly and stably adsorbs on friction interfaces. This study provides an important basis for designing graphite-based friction materials with improved properties suited for industrial applications.
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Acknowledgements
This work is supported by the National Key R&D Program of China (No. 2018YFB2000801), the National Natural Science Foundation of China (No. 51905027), the Tribology Science Fund of State Key Laboratory of Tribology (No. SKLTKF18A02), and the Fundamental Research Funds for the Central Universities (No. BUCTRC201908).
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Jun ZHAO. He received his Ph.D. degree in mechanical engineering from Tsinghua University, China. He is an associate professor in College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, China. His research interests cover the synthesis of advanced lubricating nanomaterials and applications of antifriction and antiwear materials.
Shuangxi LI. He received his M.S. and Ph.D. degrees in College of Mechanical and Electrical Engineering from Beijing University of Chemical Technology (BUCT), Beijing, China, in 2000 and 2003, respectively. He current is an associate professor in BUCT. His research areas cover the fluid machinery and sealing technology.
Yongyong HE. He received his M.S. and Ph.D. degrees in mechanical engineering from Southeast University, China, in 1994 and 1997, respectively. He joined Tsinghua University from 1999. Now, he is a professor in the State Key Laboratory of Tribology. His research areas cover surface/interface modification, chemical mechanical polishing, and ultra-smooth surface polishing.
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Zhao, J., Li, Q., Li, S. et al. Influence of a carbon-based tribofilm induced by the friction temperature on the tribological properties of impregnated graphite sliding against a cemented carbide. Friction 9, 686–696 (2021). https://doi.org/10.1007/s40544-019-0358-3
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DOI: https://doi.org/10.1007/s40544-019-0358-3