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<p>The rising application of diamond-like carbon (DLC) coatings on engine components requires a thorough examination of the interaction processes between DLC and fully formulated engine oil. This study demonstrates the critical role of overbased detergent additives, both in fully formulated and model lubricants, in reducing friction as a function of contact pressure in the boundary lubrication regime for hydrogen-containing DLC a-C:H involved tribo-pairs. Transmission Electron Microscope (TEM) reveals that the calcite formed during friction from overbased detergents plays a significant role in decreasing friction under high contact loads. Furthermore, the interaction between pressure conditions and the nature of the counterfaces dictates the type of calcium carbonate polymorph formed in the sliding contact, which significantly affects the tribological performance of the lubricant.</p>

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Key Role of Overbased Detergents in Load-Induced Friction Reduction for Steel and DLC-Involved Contacts

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Y. Guan,
  • J. Galipaud,
  • F. Dubreuil,
  • J. Dufils,
  • E. Macron,
  • F. Dassenoy,
  • M. I. de Barros Bouchet

摘要

The rising application of diamond-like carbon (DLC) coatings on engine components requires a thorough examination of the interaction processes between DLC and fully formulated engine oil. This study demonstrates the critical role of overbased detergent additives, both in fully formulated and model lubricants, in reducing friction as a function of contact pressure in the boundary lubrication regime for hydrogen-containing DLC a-C:H involved tribo-pairs. Transmission Electron Microscope (TEM) reveals that the calcite formed during friction from overbased detergents plays a significant role in decreasing friction under high contact loads. Furthermore, the interaction between pressure conditions and the nature of the counterfaces dictates the type of calcium carbonate polymorph formed in the sliding contact, which significantly affects the tribological performance of the lubricant.