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<p>Improving the tribological performance of gears is critical for extending their service life and enhancing reliability. In this study, biomimetic scale-like fan-shaped surface textures inspired by the overlapping structure of pangolin scales were fabricated on AISI 4140 steel. These textures were filled with a composite solid lubricant consisting of SnAgCu (SAC) and MoS<sub>2</sub>. The results demonstrated that, compared to untextured AISI 4140, the textured samples incorporating SnAgCu-MoS<sub>2</sub> (TASSM) exhibited reductions in average friction coefficient and wear depth by 18.9% and 9.8%, respectively, under dry sliding conditions, and by 18.4% and 81.8%, respectively, under oil-lubricated conditions. The synergistic effect of the layered MoS<sub>2</sub> and SnAgCu, combined with the presence of lubricating oil, facilitates the formation of a stable and continuous lubricating film. This dual lubrication system contributes significantly to the improvements in friction reduction and wear resistance.</p>

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Combining Oil–Solid Dual Lubrication System with Bionic Scaly Texture to Improve the Tribological Performance of AISI 4140 Steel

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Tengbin Yan,
  • Chaohua Wu,
  • Xiaoliang Shi,
  • Kunpeng Chen,
  • Weiheng Chen

摘要

Improving the tribological performance of gears is critical for extending their service life and enhancing reliability. In this study, biomimetic scale-like fan-shaped surface textures inspired by the overlapping structure of pangolin scales were fabricated on AISI 4140 steel. These textures were filled with a composite solid lubricant consisting of SnAgCu (SAC) and MoS2. The results demonstrated that, compared to untextured AISI 4140, the textured samples incorporating SnAgCu-MoS2 (TASSM) exhibited reductions in average friction coefficient and wear depth by 18.9% and 9.8%, respectively, under dry sliding conditions, and by 18.4% and 81.8%, respectively, under oil-lubricated conditions. The synergistic effect of the layered MoS2 and SnAgCu, combined with the presence of lubricating oil, facilitates the formation of a stable and continuous lubricating film. This dual lubrication system contributes significantly to the improvements in friction reduction and wear resistance.