铸铁滑动摩擦副边界润滑表面膜的考察

Research on the Surface Film of Cast lron Pairs in Boundary Lubricated Sliding Wear

在铸铁材料油润滑与线接触滑动磨损机制研究的基础上，对这种材料在边界润滑状态下表面膜的形成、识别、结构组成和导致膜破裂脱落的因素作了试验研究与考察，摩擦磨损过程中，摩擦表面在摩擦热的作用下，缺陷增多，塑性变形加剧，润滑油和空气中的氧通过扩散流动进入变形层，从而形成较厚的扩散反应膜，其主要成分是Ｆｅ３Ｏ４氧化膜．在给定的工况下，摩擦界面自动生成保护性氧化膜．摩擦磨损过程是氧化膜形成与破裂脱落的动态平衡过程，一旦这种平衡建立，系统就处于轻微的氧化磨损状态．

Based upon the research on sliding wear mechanisms of cast iron materials underthe condition of linear contact lubricated,and used the methods of Auger energy spectroscopy(AES),X-ray photoelectron spectroscopy(XPS),transmission electron miCroscopy and X-ray diffractometer(XRD),the formation,distinguishing,constructure and breakaway of the sur- face film under boundarv lubrication have been examined.During the process of friction-wear,the defect and plastic deformation on friction surfaces are increased due to local stress and fric- tion heat.The oxygen in lubricant and air gets into the deformed surfaces by a way of diffu- sion. A thinker diffusion film is formed,which mainly consists of Fe3O4 oxide film and has a role of protecting the fricion surfaces against wearing fastly.The protective oxide film is formed automatically on the friction surfaces under certain load and velocity. The process of friction-wear is a dynamic equilibrium process between the formation of the protective oxide films and their destruction by rubbing contact.Once the balance is set up,the friction system enters a status of mild oxidational wear. The breakdown of the oxide film is closely related to that a great quantity of the γ-phase grows in the layers of wear surfaces.