涂层材料热特性参数对点接触弹流润滑的影响  

Effect of Thermal Properties of Surface Coatings on PointContact Elastohydrodynamic Lubrication

作　　者：苏振华 崔金磊 曹丰铄 刘晓玲 SU Zhenhua;CUI Jinlei;CAO Fengshuo;LIU Xiaoling(School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao Shandong 266520,China)

机构地区：[1]青岛理工大学机械与汽车工程学院,山东青岛266520

出　　处：《润滑与密封》2024年第7期31-39,共9页Lubrication Engineering

基　　金：国家自然科学基金项目(51875298)。

摘　　要：为探究涂层材料热特性参数对点接触弹流润滑的影响,选择3种不同方法制备的类金刚石(DLC)涂层和氧化锆陶瓷涂层,构建考虑涂层热特性的点接触弹流润滑模型,分析涂层材料、涂层厚度和润滑剂的流变性对接触区润滑性能的影响。结果表明:在弹流润滑状态下具有不同热特性的4种表面涂层导致了膜厚的差异,固体表面温度及润滑区温度场会随涂层热惯性变化;热惯性最小的DLC涂层加在快速运动表面能获得更高的膜厚;随着涂层厚度的增加,会引起固体表面的温度升高,使摩擦因数降低;非牛顿流体对压力、膜厚的影响很小,但与牛顿流体相比,能获得相对较低的温度。在弹流润滑状态下,涂层覆在快表面对于减小摩擦、提高膜厚是有益的。To investigate the influence of thermal characteristic parameters of coating materials on point contact elastohydrodynamic lubrication,three diamond-like carbon(DLC)coatings prepared by different methods and zirconia ceramic coatings were selected,and the point contact elastohydrodynamic lubrication model considering the thermal properties of coating was established to analyze the effects of coating materials,coating thickness and rheological properties of lubricant on the lubrication properties of the contact zone.The results show that the four surface coatings with different thermal characteristics under elastohydrodynamic lubrication state result in differences in film thickness,and the solid surface temperature and lubrication zone temperature field will vary with the thermal inertia of the coatings.The DLC coating with minimal thermal inertia can achieve higher film thickness when it is covered on the faster surface.With the increase of coating thickness,the temperature of solid surface will rise,and the friction will decrease.The non-Newtonian fluid has little influence on the pressure and film thickness,but results in relatively lower temperature compared with the Newtonian fluid.It is beneficial to reduce friction and increase film thickness when coating is covered on the faster surface under elastohydrodynamic lubrication state.

关 键 词：表面涂层 热效应 流变性 类金刚石涂层 氧化锆 

分 类 号：TH117[机械工程—机械设计及理论]