Oil-air lubrication has been extensively used in mechanical equipment fields. The study aimed to evaluate the tribological behavior of linear contact sliding friction pairs under oil-air lubrication. An oil-air lubrication equipment was developed, and linear contact sliding friction under oil-air lubrication test was carried out on a reciprocating wear test device. Microscopic feature and composition distribution of the wear scars were conducted using scanning electron microscopy, optical white-light interferometer, energy-dispersive X-ray spectroscopy and Raman spectrometer. The influence rule of oil supply, oil pressure, airspeed, air pressure and oil temperature on the tribological behavior of linear contact sliding friction pairs was obtained. Experimental results demonstrate that the friction coefficient curves of different parameters are composed of four stages, namely, the initial stage, the recede stage, the ascent stage and the stable stage. The relationship between oil-air lubrication test parameters and wear was discussed. The wear mechanisms of linear contact sliding friction pairs under oil-air lubrication are delamination wear, abrasive wear and oxidation wear.

油气润滑已广泛应用于机械设备领域。该研究旨在评估油气润滑下线性接触滑动摩擦副的摩擦学行为。研制了油气润滑设备，在往复磨损试验装置上进行了油气润滑下的线接触滑动摩擦试验。使用扫描电子显微镜、光学白光干涉仪、能量色散X射线光谱仪和拉曼光谱仪对磨痕的微观特征和成分分布进行了研究。得到了供油量、油压、空速、气压和油温对线接触滑动摩擦副摩擦学行为的影响规律。实验结果表明，不同参数的摩擦系数曲线由四个阶段组成，即初始阶段、后退阶段、上升阶段和稳定阶段。讨论了油气润滑试验参数与磨损的关系。油气润滑下线接触滑动摩擦副的磨损机理为分层磨损、磨粒磨损和氧化磨损。