微量润滑条件下Si_3N_4陶瓷-白口铸铁的摩擦学性能研究

Research on tribology property of Si_3N_4 ceramic and chilled iron under oil-less lubrication

采用块-盘式摩擦磨损试验方法,在M G-200摩擦磨损试验机上对S i3N4陶瓷-白口铸铁摩擦副进行了微量润滑条件下的摩擦磨损试验,同时根据试件的SM E照片和能谱成分分析了摩擦磨损机理,为陶瓷材料的制备及减少磨损提供理论依据.试验和分析结果表明:微量润滑条件下S i3N4陶瓷的磨损率和摩擦系数要比干摩擦条件下小得多;S i3N4陶瓷的磨损率随载荷的增大而增大,滑动速度对磨损率的影响要小于载荷对其的影响;S i3N4陶瓷-白口铸铁的摩擦系数随速度的增大而减小,载荷的变化对摩擦系数的影响不大;S i3N4陶瓷的磨损是化学磨损、机体物质脱落和磨粒磨损共同作用的结果,其中化学磨损起主导作用.

A series of tests on friction and wear of Si3N4 ceramic and chilled iron under oil-less lubrication were conducted on MG-200 Friction Wear Machine by adopting block-on-disc wear test method, during which the values of wear rate and friction coefficient of Si3N4 ceramic and chilled iron were achieved. Additionally the friction and wear behaviors were analyzed through SME images and percentage of different chemical elements distributed on friction surface. The result indicated wear rates of Si3N4 ceramic and friction coefficient between Si3N4 ceramic and chilled iron under oil-less lubrication are much less than wear rates and friction coefficient under dry friction condition. Wear rate of Si3N4 ceramic rose with the increase of loads between Si3N4 ceramic and chilled iron while the effect of relative sliding speed on wear rate of Si3N4 ceramic is not as significant as that of load. For the friction coefficient between Si3N4 ceramic and chilled iron, it decreased with the increase of relative sliding speed and the change on load had little influence on it. Wear of Si3N4 ceramic was caused by interaction of chemical wear, abrading wear and particle＇s peeling off, among which the chemical one was dominant.