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Effects of Friction Layer Thickness on the Tribological Performance of Ni3Al-Ag-MoO3

  • Yuchun Huang
  • Xiaoliang Shi
  • Kang Yang
  • Jialiang Zou
  • Qiao Shen
  • Yufu Wang
  • Zhihai Wang
Article

Abstract

In order to analyze the effects of friction layer thickness on the tribological performance of Ni3Al matrix self-lubricating composites containing Ag and MoO3 tabular crystals (Ni3Al-Ag-MoO3), the dry sliding tribological tests of Ni3Al-Ag-MoO3 against Si3N4 ball are undertaken under 4-16 N and 20-800 °C at 0.2 m/s. The results show that the friction layer thickness of Ni3Al-Ag-MoO3 is obviously affected by the applied loads and ambient temperatures. At 12 N-400 °C-0.2 m/s, Ni3Al-Ag-MoO3 exhibits excellent tribological performance, and the friction layer thickness obtained the maximum value of about 5 µm. Moreover, the simulation results, which based on the building of finite element models with different thickness of the friction layer, indicate that the decreased degree of the maximum equivalent stress in the substrate of Ni3Al-Ag-MoO3 with maximum thickness of friction layer is the larger one (about 39%), if compared to other thickness. It could avoid the generation of cracks and the spalling of subsurface materials during the dry sliding process, resulting in the excellent tribological performance. The results could be used to guide the selection of suitable working conditions and study the self-lubricating mechanisms of Ni3Al-Ag-MoO3 for having stable friction layer structure and excellent antifriction and antiwear performance.

Keywords

self-lubricating composites solid lubrication mechanisms solid lubrication wear wear mechanisms 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (51275370); Self-determined and Innovative Research Funds of WUT (135204008); and the Fundamental Research Funds for the Central Universities (2017-YB-019 and 2016-zy-014); authors were grateful to Y.M. Li, X.L. Nie, 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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Copyright information

© ASM International 2017

Authors and Affiliations

  • Yuchun Huang
    • 1
  • Xiaoliang Shi
    • 1
  • Kang Yang
    • 1
  • Jialiang Zou
    • 1
  • Qiao Shen
    • 1
  • Yufu Wang
    • 1
  • Zhihai Wang
    • 1
  1. 1.School of Mechanical and Electronic EngineeringWuhan University of TechnologyWuhanChina

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