Abstract
Diamond-like carbon (DLC) and graphite-like carbon (GLC) coatings have good prospects for improving the surface properties of engine parts. However, further understanding is needed on the effect of working conditions on tribological behaviors. In this study, GLC and two types of DLC coatings were deposited on GCr15 substrate for investigation. The friction and wear properties of self-mated and steel-mated pairs were evaluated. Two temperatures (25 and 90 °C), three lubrication conditions (base oil, molybdenum dithiocarbamate (MoDTC)-containing oil, MoDTC+zinc dialkyldithiophosphate (ZDDP)-containing oil), and high Hertz contact stress (2.41 GPa) were applied in the experiments. The results showed that high temperature promoted the effect of ZDDP on steel-mated pairs, but increased wear under base oil lubrication. The increased wear for steel-mated pairs lubricated by MoDTC-containing oil was due to abrasive wear probably caused by MoO3 and β-FeMoO4. It was also found that in most cases, the tribological properties of self-mated pairs were better than those of steel-mated pairs.
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Acknowledgements
This work was supported by the Beijing Municipal Natural Science Foundation (3182032), the National Natural Science Foundation of China (41772389), the Pre-Research Program in National 13th Five-Year Plan (61409230603), and Joint Fund of Ministry of Education for Pre-research of Equipment for Young Personnel Project (6141A02033120).
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Kang LIU. He got his master degree in 2020 at China University of Geosciences (Beijing). His research interests include lubricating additives and carbon-based films.
Jia-jie KANG. He got his Ph.D. degree in 2013 at China University of Geosciences (Beijing). He is an associate professor at the China University of Geosciences (Beijing). He has authored or co-authored more than 100 journal papers. His research interests are lubricating additives and thermal spray coatings.
Guang-an ZHANG. He received his Ph.D. degree from Lanzhou University in 2008. After then, he has been working in the State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences. His research interest focuses on the tribological mechanism and application of carbon-based thin films.
Zhi-bin LU. He received his Ph.D. degree from Lanzhou University in 2009. After then, he has been working in the State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences. In recent years, he has been studying on the tribological mechanism of carbon-based thin films and the new theory of super-low friction.
Wen YUE. He got his Ph.D. degree in 2009 at China University of Geosciences (Beijing). He is a professor at China University of Geosciences (Beijing). He has authored or co-authored more than 150 journal papers. His research interests are lubricating additives and carbon-based thin films.
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Liu, K., Kang, Jj., Zhang, Ga. et al. Effect of temperature and mating pair on tribological properties of DLC and GLC coatings under high pressure lubricated by MoDTC and ZDDP. Friction 9, 1390–1405 (2021). https://doi.org/10.1007/s40544-020-0420-1
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DOI: https://doi.org/10.1007/s40544-020-0420-1