Abstract The major objective of this work was to investigate the tribological performance of zinc oxide, (ZnO), multiwalled carbon nanotubes (MWCNTs) and ZnO/MWCNTs hybrids as lubricant additive in commercially available 10W40 engine oil. The tribological experiments were carried out on bronze alloy-steel contacts using linear reciprocating ball-on-disk tribotester. The different mass ratios and concentrations of ZnO/MWCNTs nanomaterials were also varied to evaluate the optimal performance. The tribological results revealed that the ZnO/MWCNTs hybrid nanomaterials in the engine oil exhibited significantly enhanced friction reduction and higher antiwear capability than that of the pure oil, individual ZnO nanoparticles and MWCNTs. The engine oil containing an optimum concentration of 0.25 wt % ZnO/MWCNTs nanomaterials at a ratio of 3:1 resulted in a substantial reduction in the friction coefficient and wear volume by 32.30% and 74.48% respectively as compared to the engine oil. The worn bronze surfaces morphology and chemical compositions were examined by scanning electron microscope, 3D optical profilometer, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS).

中文翻译：

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氧化锌/多壁碳纳米管杂化纳米材料作为发动机油中有效润滑油添加剂的摩擦学性能增强

摘要 这项工作的主要目的是研究氧化锌 (ZnO)、多壁碳纳米管 (MWCNTs) 和 ZnO/MWCNTs 混合物作为润滑油添加剂在市售 10W40 发动机油中的摩擦学性能。使用线性往复式球盘摩擦仪在青铜合金-钢触点上进行摩擦学实验。ZnO/MWCNTs 纳米材料的不同质量比和浓度也不同，以评估最佳性能。摩擦学结果表明，发动机油中的 ZnO/MWCNTs 混合纳米材料比纯油、单个 ZnO 纳米颗粒和 MWCNTs 表现出显着增强的减摩和更高的抗磨损能力。发动机油中含有最佳浓度为 0.25 wt% 的 ZnO/MWCNTs 纳米材料，比例为 3：与发动机油相比，1 的摩擦系数和磨损量分别显着降低了 32.30% 和 74.48%。通过扫描电子显微镜、3D 光学轮廓仪、拉曼光谱和 X 射线光电子能谱 (XPS) 检查磨损的青铜表面形貌和化学成分。