Abstract Silver sulfide (Ag2S) nanoparticles were prepared by in-situ method, and displayed the small size and good dispersibility in the lubricating coatings. A simple strategy was provided to regulate the size of the Ag2S nanoparticles. The influences of Ag2S nanoparticles and their sizes on the micro-hardness and tribological behaviours of the lubricating coatings were investigated, and the corresponding tribological mechanisms were discussed. Detailed investigation showed that the in-situ synthesized Ag2S nanoparticles dominated by smaller-size and narrower size distribution increased the micro-hardness by 53.39% and reduced wear rate by 26.41%. The friction coefficient was independent to their size and size distribution. The superior tribological performance was attributed to the synergetic roles of the stronger micro-hardness and the high load-carrying tribofilm.

中文翻译：

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原位合成尺寸可调的硫化银纳米颗粒以改善聚四氟乙烯基纳米复合润滑涂层的摩擦学性能

摘要 采用原位法制备了硫化银（Ag2S）纳米颗粒，在润滑涂层中表现出粒径小、分散性好的特点。提供了一种简单的策略来调节 Ag2S 纳米粒子的尺寸。研究了Ag2S纳米颗粒及其尺寸对润滑涂层显微硬度和摩擦学行为的影响，并讨论了相应的摩擦学机理。详细研究表明，原位合成的Ag2S纳米颗粒以较小尺寸和较窄的尺寸分布为主，显微硬度提高了53.39%，磨损率降低了26.41%。摩擦系数与其尺寸和尺寸分布无关。