作　　者： ; ; ; ;

机构地区： 清华大学机械工程学院摩擦学国家重点实验室

出　　处： 《机械工程学报》 2003年第2期1-7,共7页

摘　　要： 混合润滑是机械中广泛存在的润滑状态。从试验方面研究了由接触、边界润滑和薄膜润滑组成的点接触区混合润滑状态的特性,提出使用动态接触率来描述混合润滑状态,并研究了各种参数对动态接触率的影响。结果表明,在混合润滑状态下,动态接触率与接触中心平均膜厚成指数函数关系。速度和粘度的增大会减小动态接触率,载荷的增加则会增大接触率,极性添加剂分子的使用会减小实际粗糙峰之间的接触,从而降低动态接触率。另外,低速下,综合粗糙度小的摩擦副表面的接触率要大于粗糙度大的表面的接触率;随着卷吸速度的提高,粗糙度小的表面的动态接触率小于粗糙度大的表面的动态接触率。 Mixed lubrication in the nano-scale is discussed, which is constituted from dry friction, boundary lubrication, thin film lubrication. A dynamic contact ratio which is the contact ration measured in the rolling process is used to describe the nano-mixed lubrication, and the relationship between the contact ratio and its influence factors is investigated. Experimental results indicate that the dynamic contact ratio increases with the decrease of thin film thickness by an exponential function. The decreases of speed and lubricant viscosity, and the increase of loads will enlarge the value of the contact ratio. When polar additives are added into basic oil, the contact ratio decreases. In addition, the contact ratio between smooth surfaces is larger than that between rough surfaces in lower speed. However, the contact ratio between smooth surfaces decreases more quickly with speed than that between rough surfaces, and therefore, it will become smaller than that of rough surfaces after speed increases over a critical value.

关 键 词： 混合润滑 纳米摩擦学 薄膜润滑

领　　域： [机械工程]