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WANG Jiangwen, LU Long, MENG Junhu, GUO Hongru, WANG Jingbo, WU Youzhi. High Temperature Tribological Properties of Cu-2Ni-5Sn-Graphite-PbO Self-Lubricating Composites[J]. TRIBOLOGY, 2018, 38(1): 84-92. DOI: 10.16078/j.tribology.2018.01.011
Citation: WANG Jiangwen, LU Long, MENG Junhu, GUO Hongru, WANG Jingbo, WU Youzhi. High Temperature Tribological Properties of Cu-2Ni-5Sn-Graphite-PbO Self-Lubricating Composites[J]. TRIBOLOGY, 2018, 38(1): 84-92. DOI: 10.16078/j.tribology.2018.01.011
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High Temperature Tribological Properties of Cu-2Ni-5Sn-Graphite-PbO Self-Lubricating Composites

  • 1.

    School of Material Science and Engineering, Lanzhou University of Technology, Gansu Lanzhou 730050, China

  • 2.

    State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Gansu Lanzhou 730000, China

  • 3.

    Lanzhou Industrial Research Institute, Gansu Lanzhou 730050, China

Funds: The project was supported by a grant from Major Programs of the Chinese Academy of Sciences during the 13th Five-Year Plan Period
More Information
  • Corresponding author:

    MENG Junhu, E-mail: jhmeng@licp.cas.cn, Tel: +86-931-4968378

    WU Youzhi, E-mail: youzhiwu@163.com

  • Received Date: June 06, 2017
  • Revised Date: August 30, 2017
  • Accepted Date: September 06, 2017
  • Available Online: January 09, 2018
  • Published Date: January 27, 2018
    Graphical Abstract
    • Abstract
  • Cu-2Ni-5Sn-Graphite-PbO self-lubricating composites were prepared by powder metallurgy. The microstructure and mechanical properties of the composites were examined by using X-ray diffraction, scanning electron microscopy and a universal material testing machine. And the tribological properties of the composites were investigated using a pin-on-disc friction testing configuration from room temperature to 500 ℃. The results indicate that the best comprehensive tribological properties were obtained for graphite+PbO composite of 8%. The addition of Ni enhanced the mechanical properties of the matrix. The friction coefficient of composites remained stable with the increase of temperature. The wear rates of the composites firstly slightly increased and then sharply increased with increasing temperature. At room temperature, the lubricating film was composed mainly of graphite and the main wear mechanism is mild plastic deformation and local peeling off. At 300 ℃, the improved tribological properties of the composites were attributed to the formation of a dense and lubricious film of graphite, PbO(Fe2O3)6 and Cu2O, the main wear mechanism was plastic deformation, local peeling off and adhesive wear. At 500 ℃, the composite lubricating film was composed of PbO(Fe2O3)6, graphite, Cu2O and CuO, and the main wear mechanism was the peeling off of the matrix of graphite surrounding area, peeling off caused by the plastic deformation and oxidative wear.
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