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<p>To enhance the boundary lubrication of the cylinder liner-piston ring, this study developed a diketone/nanocopper hybrid additive and investigated its interaction with reactive and non-reactive sliding surfaces. Compared to steel/steel contacts, the hybrid additive performed more effectively in the case of steel/DLC configuration. On the one hand, the lower surface energy of DLC led to a more substantial orientation effect of diketone, resulting in an elevated capacity for forming a lubricant film; on the other hand, the high hardness and chemically inert characteristics of DLC promoted the tribochemical polishing effect of diketone, resulting in a very smooth sliding interface. Based on the synergistic effect between DLC coating and the hybrid additive, a novel lubrication system with superior performance was established for marine engines.</p>

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The Synergistic Effect of DLC Coating and Diketone/Nanocopper Hybrid Additive in Marine Engine Oil

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Yuwen Xu,
  • Yan Yang,
  • Haonan Zeng,
  • Jingsi Wang,
  • Dan Jia,
  • Tobias Amann,
  • Chengqing Yuan,
  • Ke Li

摘要

To enhance the boundary lubrication of the cylinder liner-piston ring, this study developed a diketone/nanocopper hybrid additive and investigated its interaction with reactive and non-reactive sliding surfaces. Compared to steel/steel contacts, the hybrid additive performed more effectively in the case of steel/DLC configuration. On the one hand, the lower surface energy of DLC led to a more substantial orientation effect of diketone, resulting in an elevated capacity for forming a lubricant film; on the other hand, the high hardness and chemically inert characteristics of DLC promoted the tribochemical polishing effect of diketone, resulting in a very smooth sliding interface. Based on the synergistic effect between DLC coating and the hybrid additive, a novel lubrication system with superior performance was established for marine engines.