高能球磨法制备气缸套表面强化层的技术研究

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The micro and nano powder of serpentine and SiC particles are impregnated on the inner-surface of the cylinder liner by ball mill.The wear resistance of cast iron cylinder is evaluated by reciprocating friction tester.In addition,the wron surfcaes and cross sectioned surfaces are characterized by means of scanning electron microscope（SEM） and energy dispersive spectroscope（EDS）.The mechanisms invoved are discussed accordingly.Results indicate that the optimal wear-reducing result of strengthened liner layer is achieved when the material is the serpentine.Compared with the original material,the result can be drawn that the friction coefficient can be reduced by 35%,and the wear loss can be reduced to 1/3 of the original.After impregnated on the surface of cast iron,the micro and nano powder is existed as the support point and hard phase.Thereby it will support the load and prevent the deformation of the matrix,and effctively decreases the wear of the tribopair.利用球磨机将已制备的蛇纹石和SiC微纳米颗粒作为磨料挤渗镶嵌在铸铁气缸套内表面,采用往复式摩擦磨损试验机评价其耐磨性能,借助扫描电子显微镜（SEM）、能谱仪（EDS）对磨损表面及截面进行表征,探讨减摩抗磨机理.结果表明：当磨料为蛇纹石时所制备的气缸套强化层具有最佳减磨效果,其摩擦系数较珩磨气缸套降低约35,磨损量降至1/3.微纳米颗粒被挤渗镶嵌在铸铁表面后,会作为支撑点和硬质相存在,起到支撑载荷和阻止基体变形的作用,有效降低了摩擦副的磨损.