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<p>Marine gear pairs of AISI 4140 steel often suffer from excessive wear under starved-to-dry lubrication conditions. To enhance the tribological performance of AS, this study incorporated SnAgCu solid lubricant into three distinct shapes—circular (C), hexagonal (H), and a circular-hexagonal hybrid (CH). Each texture configuration was prepared at three different densities (20, 30, 40%), yielding a total of nine AS-based self-lubricating samples. The friction process was divided into three stages: stable, fluctuating, and dry friction. The optimized AS-CH30 sample exhibited a stable stage that was 111.46% longer than that of the untextured AS. During the fluctuation stage, its friction coefficient increased by only 0.018, whereas in the dry friction stage, the coefficient decreased by 33.68% relative to the untextured AS. The outstanding anti-friction and wear resistance of AS-CH30 under starved-to-dry lubrication conditions can be attributed to the optimized texture that facilitates the diffusion of SnAgCu solid lubricants across the AS substrate surface. Moreover, the micropits formed during friction serve as reservoirs for wear debris, thereby improving the tribological performance of AS under starved lubrication conditions.</p>

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Synergistic Effect of Bionic Surface Texture and SnAgCu Solid Lubricant on the Tribological Behavior of AISI 4140 Steel from Starved to Dry Lubrication

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • Shizhong Huang,
  • Qipeng Huang,
  • Xiaoliang Shi,
  • Haobing Hu,
  • Weijie Zheng

摘要

Marine gear pairs of AISI 4140 steel often suffer from excessive wear under starved-to-dry lubrication conditions. To enhance the tribological performance of AS, this study incorporated SnAgCu solid lubricant into three distinct shapes—circular (C), hexagonal (H), and a circular-hexagonal hybrid (CH). Each texture configuration was prepared at three different densities (20, 30, 40%), yielding a total of nine AS-based self-lubricating samples. The friction process was divided into three stages: stable, fluctuating, and dry friction. The optimized AS-CH30 sample exhibited a stable stage that was 111.46% longer than that of the untextured AS. During the fluctuation stage, its friction coefficient increased by only 0.018, whereas in the dry friction stage, the coefficient decreased by 33.68% relative to the untextured AS. The outstanding anti-friction and wear resistance of AS-CH30 under starved-to-dry lubrication conditions can be attributed to the optimized texture that facilitates the diffusion of SnAgCu solid lubricants across the AS substrate surface. Moreover, the micropits formed during friction serve as reservoirs for wear debris, thereby improving the tribological performance of AS under starved lubrication conditions.