In the present study, the performance of a 4-stroke diesel engine was experimentally evaluated upon adding Al₂O₃ or SiO₂ nanoparticles to the engine oil (SAE15W40). The viscosity and density of the resulting nanolubricants were determined while varying both the nanoparticle volume fraction and the temperature. Field emission scanning electron microscopy (FE–SEM) showed that the nanoparticles had a spherical morphology and dynamic light scattering analysis determined some aggregation of the nanoparticles in the engine oil. A pin-on-disc test apparatus was used for friction and wear analysis in the presence of the nanolubricants. Examination of wear scars by FE–SEM and energy dispersive spectroscopy found evidence of ball bearing and surface polishing effects, which were responsible for improvements in the tribological properties of the oil. The performance of these nanolubricants in a 4-stroke diesel engine test rig was assessed, and the greatest improvements in the tribological behavior and engine performance were observed when employing 0.3 vol% Al₂O₃.

在本研究中，通过添加Al ₂ O ₃或SiO ₂对四冲程柴油机的性能进行了实验评估。纳米粒子添加到机油（SAE15W40）中。在改变纳米颗粒的体积分数和温度的同时确定所得纳米润滑剂的粘度和密度。场发射扫描电子显微镜（FE-SEM）表明，纳米粒子具有球形形态，动态光散射分析确定了机油中纳米粒子的一些聚集。在纳米润滑剂的存在下，将销钉盘测试设备用于摩擦和磨损分析。通过FE–SEM和能量色散光谱对磨损痕迹的检查发现了滚珠轴承和表面抛光效果的证据，这有助于改善油的摩擦学性能。评估了这些纳米润滑剂在4冲程柴油发动机试验台中的性能，₂ O ₃。