工业免维护滑板铁基自润滑材料在不同速度下的摩擦学行为

Tribological Behavior of Iron-based Self-lubricating Composites Used in Industrial Maintenance-free Sliding Plates

采用粉末冶金工艺制备了四种不同成分含量的铁基自润滑材料,对材料的微观组织和不同速度下的摩擦学性能进行分析和考察,采用金相显微镜和扫描电子显微镜(SEM)以及X射线衍射仪(XRD)对材料金相、磨痕表面形貌和成分进行表征。结果表明,随着摩擦速度的提高,铁基自润滑材料与40Cr钢盘的摩擦系数呈现降低的趋势,材料中石墨含量越高,速度对其磨损率的影响就越大,在摩擦速度为0.1~0.5m/s的条件下,磨损率达到了10^(-8)cm^3/N·m量级,属于轻微磨损,在1m/s的条件下,Fe-Ni-Mo-C自润滑材料的干摩擦摩擦系数达到了0.27,虽然磨损趋势随速度升高而升高,但与较低石墨含量和不添加石墨的材料相比摩擦磨损性能较优。总体来讲,本文所研制的铁基自润滑材料在不同速度工况下具有较好的摩擦学性能。

Iron-based self-lubricating composites with varying element contents were fabricated by powder metallurgy technology.Tribological properties were investigated with a pin-on-disc tribometer at room temperature.The microstructure were analyzed by a metallography microscope.Scanning electron microscope（SEM）and X-ray diffraction（XRD）were utilized to characterize microstructure,morphologies and phase of the composites.The experimental results indicated that friction coefficient of Fe-based self-lubricating composites against 40 Cr steel plate decreased after rubbed,and they belonged to the mild wear and the minimum reached the order of 10^（-8）cm^3/N·m at speed of 0.1m/s to 0.5m/s,the lowest friction coefficient of Fe-Ni-Mo-C self-lubricating composites against 40 Cr steel was 0.27 at dry friction.Although the wear rised with speed,but it is very stable compared with the composite contained no graphite or lower graphite.Combined with friction coefficient,iron-based self-lubricating composites prepared by this technology showed excellent tribological performance at different friction speed.