TiAlN涂层往复滑动的摩擦学性能研究

为研究硬质合金表面沉积的TiA lN涂层的摩擦学行为,在不同介质(干态、乳化液、冷却油)条件和试验参数(法向载荷和位移幅值)下,进行了往复滑动摩擦磨损试验。在动力学分析基础上,结合光学显微镜(OM)、激光共焦扫描显微镜(LCSM)、扫描电子显微镜(SEM)和电子能谱(EDS)等微观分析手段对摩擦学性能进行了研究。结果显示:在同样条件下,涂层在试验初期的摩擦因数较小;法向载荷增大,涂层的摩擦因数降低,而位移幅值对涂层摩擦因数的影响不明显;基体的磨损机制主要为磨粒磨损,而涂层剥落是剥层和氧化磨损共同作用的结果;在润滑条件下,涂层的摩擦学性能得到了很大的改善,使涂层寿命得到显著延长,其中冷却油的效果最明显。

Study on Tribological Properties of Reciprocating Sliding of TiAlN Coating

To examine the tribological behaviors of TiAlN coating which deposited on the surface of wimet substrate,the reciprocating sliding tests were carried out under different media(in air,in emulsion and in coolant oil) and different parameters(normal loads and displacement amplitudes).Dynamic analyses in combination with microscopic examinations through optical microscopy(OM),laser confocual scanning microsopy(LCSM),scanning electron microscopy(SEM),and electron energy spectrum(EDS) were performed.The results show that the friction coefficient of the coating is relatively lower than that of its substrate in initial stages of the tests under the same test condition.The friction coefficient of the coating is reduced with the increase of the normal loads,and no obvious effect can be observed with the change of the displacement amplitudes.For the substrate material,the wear mechanism is main abrasive wear.The wear of the coating is the combination of the delamination and oxidation wear.Under the lubrication condition,the tribological properties and anti-wear life of the coating are improved evidently.The lubrication effect of coolant oil is better than that of emulsion.