Abstract
In this work, a super-low friction coefficient of 0.003 was found between a silicon nitride ball and a sapphire plate lubricated by phosphoric acid solution. The wear mainly occurred in the running-in period and disappeared after superlubricity was achieved. The friction coefficient was effectively reduced from 0.3 to 0.003 at a constant speed of 0.076 m/s, accompanied by a 12-nm-thickness film. The lubrication regime was indicated to change from boundary lubrication in the running-in period to elastohydrodynamic lubrication in the superlubricity period, which is also supported by the results of the friction coefficient versus sliding speed. In addition, the experimental results showed good agreement with theoretical calculations based on the elastohydrodynamic lubrication theory, suggesting a significant hydrodynamic effect of phosphoric acid on superlubricity.
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Mingming DENG. He received his Bachelor degree in mechanical engineering in 2012 from University of Science and Technology of China, Hefei, China. Now he is a PhD candidate in mechanical engineering at Tsinghua University. His research area is mainly about the water based superlubricity.
Chenhui ZHANG. He received his PhD degree in mechanical engineering from Tsinghua University, Beijing, China in 2004. From then, he worked at the State Key Laboratoty of Tribology at Tsinghua. From February 2011 to August 2011, he was invited to Lulea University of Technology in Sweden as a visiting scholar. Then he was invited to Weizmann Institute of Science in Israel as a visiting scientist from February 2012 to January 2013. His current position is an associate professor at Tsinghua University. His research areas cover surface coatings technology and lubrication theory. His current research interest focuses on the water based lubrication and superlubricity.
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Deng, M., Zhang, C., Li, J. et al. Hydrodynamic effect on the superlubricity of phosphoric acid between ceramic and sapphire. Friction 2, 173–181 (2014). https://doi.org/10.1007/s40544-014-0053-3
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DOI: https://doi.org/10.1007/s40544-014-0053-3