Abstract Hexagonal boron nitride (h-BN) nanosheets, spherical W nanoparticles, and their combinations were utilized as lubricant additives to synthetic PAO6 oil. The addition of W NPs led to a decrease in the coefficient of friction and wear rate. Molecular dynamics (MD) simulations and in situ TEM mechanical tests showed that the positive effect of adding spherical W NPs can be attributed to their rolling and sliding in the tribological contact zone. Adding BN nanosheets to PAO6 also improved the tribological performance of friction pairs: MD simulations suggest that the exfoliation and sliding of BN layers under tribological contact can contribute to the reduction of friction and wear. Moreover, a synergistic effect from the simultaneous addition of W and BN nanoparticles was observed: the CoF and wear reached minimum values among all tested suspensions. The formation of W/BN core/shell structures by wrapping of W nanoparticles by h-BN sheets provided superior macroscale lubricity.

中文翻译：

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h-BN纳米片和球形W纳米颗粒添加剂对基础油的摩擦减摩机理：实验研究和分子动力学模拟

摘要 六方氮化硼 (h-BN) 纳米片、球形 W 纳米颗粒及其组合被用作合成 PAO6 油的润滑剂添加剂。W NPs的添加导致摩擦系数和磨损率的降低。分子动力学 (MD) 模拟和原位 TEM 力学测试表明，添加球形 W NP 的积极影响可归因于它们在摩擦接触区的滚动和滑动。将 BN 纳米片添加到 PAO6 还改善了摩擦副的摩擦学性能：MD 模拟表明，摩擦学接触下 BN 层的剥离和滑动有助于减少摩擦和磨损。此外，观察到同时添加 W 和 BN 纳米颗粒的协同效应：CoF 和磨损在所有测试的悬架中都达到了最小值。通过用 h-BN 片包裹 W 纳米颗粒形成 W/BN 核/壳结构提供了优异的宏观润滑性。