• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2023, Vol. 59 ›› Issue (18): 54-68.doi: 10.3901/JME.2023.18.054

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Effect of Serpentine/Nano-Cu Composites as Lubricant Additive on Tribological Properties of Tin Bronze

YIN Yanli1, YU Helong1, WANG Hongmei1, WEI Min2, SHI Peijing2, BAI Zhimin3, ZHANG Wei2   

  1. 1. National Key Laboratory for Remanufacturing, Army Academy of Armored Force, Beijing 100072;
    2. Hebei Jingjinji Institute of Remanufacturing Industry & Technology, Hejian 062450;
    3. School of Materials Science and Technology, China University of Geosciences, Beijing 100083
  • Received:2022-09-29 Revised:2023-05-30 Online:2023-09-20 Published:2023-12-07

Abstract: The effect of surface organic modified serpentine and nano-Cu composites as lubricant additive on tribological properties of tin bronze matching with GCr15 steel is investigated by SRV oscillating sliding wear tester. Scanning electron microscope (SEM), X-ray energy dispersive spectroscopy(EDS), X-ray photoelectron spectroscopy(XPS), and nanoindenter are used to analyze the morphology of surface and section, elemental composition, chemical state, and nano mechanical properties of worn surfaces. The friction reducing and anti-wear mechanism of serpentine and nano-Cu composites on tin bronze and their synergistic action mechanism are discussed. Results show that single component serpentine and nano-Cu additives can improve tribological properties of tin bronze, and the improvement effect is significantly enhanced after serpentine and nano-Cu compounded, and the friction coefficient and wear volume of tin bronze are reduced by 26.3%~39.2% and 72.6%~88.9% respectively, compared with base oil lubrication. Serpentine and nano-Cu play a positive role in tribology, and a composite self-repairing film composed of metal oxide, silicon oxide, sulfide, graphite, organic matter and nano-Cu particles is formed on the tin bronze surface. The self-repairing film has a multilayer and it is dense and smooth, with the thickness of 3.73 mm, and its nanohardness, elastic modulus and nanohardness/modulus have the gradient variation that low in the surface and high in the subsurface, as contributed to the improvement of the tribological behaviors of tin bronze.

Key words: serpentine, nano-Cu, composites additives, tribological behaviors, tin bronze

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