纳米TiO2和Al2O3添加剂润滑油对缸套-活塞环摩擦磨损性能的影响

摘要

以普通5W-30润滑油作为基础油,按一定配比添加纳米Al2O3和TiO2粉末,通过实验台架高度模拟缸套-活塞环的工作环境,研究不同载荷下纳米添加剂润滑油对缸套-活塞环摩擦副摩擦磨损特性的影响.使用二分力拉压传感器和数据采集系统测量及保存摩擦副的受力;用0.1 mg精度电子天平测量摩擦前后活塞环的质量损失;用三维表面轮廓仪扫描试样表面形貌;用场发射扫描电镜对样本进行微观观察及能谱分析.实验结果表明,纳米Al2O3和TiO2添加剂润滑油能够显著的改善缸套-活塞环摩擦副的摩擦磨损性能,同5W-30基础油相比,纳米Al2O3润滑油使摩擦副的摩擦因数和磨损率分别降低48.5%和21.6%,而纳米TiO2润滑油则分别降低49.9%和37.6%,表面平整度及表面磨痕也相应得到改善.%Choosing ordinary synthetic oil 5W-30 as the base oil, an experiment is carried out by using simulation workbench to study the effect of nano Al2O3 and TiO2 on the wear and friction of cylinder liner/piston ring.Friction forces and weight loss are measured by data acquisition with composite sensor and electronic balance.The morphology and EDS map of rubbing pair are investigated by 3-D profiler and FESEM.Compared with the base oil, the obtained results show that friction coefficient and wear rate decrease by 49.9% and 37.6%, respectively for using oil with TiO2.In addition, the friction coefficient and wear rate decrease by 48.5% and 21.6%, respectively, for using oil with Al2O3.