【摘要】 利用MG-200型高速高温摩擦磨损试验机,采用块-盘式实验方法,对Si3N4陶瓷-冷激铸铁摩擦副从室温到150℃进行了微量润滑摩擦磨损实验,得到了该摩擦副的摩擦系数和Si3N4陶瓷的磨损率。同时根据试件的SEM照片和能谱成分分析了摩擦磨损机理,并与无润滑时所得实验结果进行了比较。结果表明:微量润滑条件下Si3N4陶瓷的磨损率和摩擦系数要比无润滑条件下小的多;Si3N4陶瓷的磨损率随载荷和温度的增大而增大,滑动速度的影响要小于载荷的影响;该摩擦副的摩擦系数随环境温度的提高而增大,随速度的增大而减小,载荷的变化对其影响不大;Si3N4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,其中化学磨损是引起其他两类磨损的主要原因。更多还原

【Abstract】 The friction and wear tests for mated couples of silicon nitride（Si₃N₄）and chilled cast iron under the oil-less lubrication were carried out by means of block-on-disc with MG-200 wear machine from room temperature to 150℃,the friction coefficients of mated couples and wear rates of Si₃N₄ were gained,and the friction and wear behaviors were analyzed by the wear rates,friction coefficients,SEM images and percentages of chemical elements on worn surfaces.The results showed that the wear rate of Si₃N₄ and friction coefficient between Si₃N₄ and chilled cast iron with oil-less lubrication are much less than those with dry friction condition;the wear rate of Si₃N₄ increases with the increase of load and temperature,and the effect of sliding speed on wear rate of Si₃N₄ is not as significant as the effect of load;the friction coefficient between Si₃N₄ and chilled cast iron decreases with sliding speed,but increases with temperature,and the load has little effect on friction coefficient;the wear of Si₃N₄ is caused by interaction of chemical wear,abradant wear and particles’ peeling off,and chemical wear is origin in other two.更多还原