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HVOF-Sprayed Adaptive Low Friction NiMoAl–Ag Coating for Tribological Application from 20 to 800 °C

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Abstract

An adaptive NiMoAl–Ag composite coating was deposited by high-velocity oxy fuel spraying, and its tribological properties from 20 to 800 °C under unlubricated conditions were evaluated using a CSM high-temperature tribometer. Scanning electron microscopy, X-ray diffraction and Raman spectroscopy were used to characterize the coating and corresponding wear tracks to determine the lubrication mechanisms. The results showed that the friction coefficient of the NiMoAl–Ag composite coating was around 0.3 from 20 to 600 °C and reached the lowest value of 0.09 at 800 °C. Meanwhile, wear rates of the coating were maintained on the order of 10−5 mm3/N m at the test temperatures except for 400 and 600 °C. Characterization of the NiMoAl–Ag coating revealed that silver provided lubrication below 400 °C. Ag2Mo2O7 and Ag2MoO4, which were formed through tribochemical reactions, acted as high-temperature lubricants above 400 °C. It was especially proposed that silver in a nearly molten state was effective in reducing the friction of the NiMoAl–Ag coating at 800 °C. Moreover, a comprehensive lubrication mechanism model of an NiMoAl–Ag composite coating at 800 °C was established to explain the extremely low friction coefficient and wear rate of the coating.

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Acknowledgments

The authors are grateful to the National Natural Science Foundation of China (Grant Nos. 51302272, 51275509 and 51175491), the 973 Project of China (No. 2013CB632300) and the Chinese Academy of Sciences for financial support.

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Authors and Affiliations

  1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou, 730000, People’s Republic of China

    Jie Chen, Xiaoqin Zhao, Huidi Zhou, Jianmin Chen, Yulong An & Fengyuan Yan

  2. University of Chinese Academy of Sciences, Beijing, People’s Republic of China

    Jie Chen

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  1. Jie Chen
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  2. Xiaoqin Zhao
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Correspondence to Jie Chen, Yulong An or Fengyuan Yan.

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Chen, J., Zhao, X., Zhou, H. et al. HVOF-Sprayed Adaptive Low Friction NiMoAl–Ag Coating for Tribological Application from 20 to 800 °C. Tribol Lett 56, 55–66 (2014). https://doi.org/10.1007/s11249-014-0382-4

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  • DOI: https://doi.org/10.1007/s11249-014-0382-4

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