蠕墨铸铁干摩擦表面形貌研究

运用三维表面形貌测试技术，分析了蠕墨铸铁的干摩擦表面接触形貌特征，并从传热学的角度分析了摩擦表面形貌特征与其干摩擦学特性的关系，结果表明：蠕墨铸铁干摩擦表面主要有犁沟型、弧岛型和犁沟－弧岛混合型３种特征形貌，犁沟型和弧岛型特征形貌沿垂直于摩擦表面方向不对称分布；而混合型特征形貌沿垂直于摩擦表面方向对称分布；犁沟型表面形貌的最大高度最大，空隙率最高，而弧岛型表面形貌的最大高度最小，空隙率最低；表面形

Investigation on Topography of Dry Sliding Surface of Compacted Graphite Cast Iron

By using 3 D surface topographical measurement,the topographical features of dry sliding surface of compacted graphite cast irons(C G irons) were investigated. The experimental results indicate that the surfaces are characteristic of pit peak like and groove ridge as well as combined topography. For the groove ridge surface, the sliding surface height has a very large range in the direction perpendicular to the sliding surface and the surface height distribution is asymmetric. For the pit peak surface, the surface height distribution range is very small and its surface height also has asymmetric distribution. For the combined topographical surface, the surface height distribution is symmetric and its range medium. In view of the effects of surface topographical characteristics on the tribological properties, it is suggested that surface height distribution range and void volume ratio are the two most important factors which influence the efficiency of frictional heat transfer to far end of the contacting zones, thereby,the surface with pit peak topography presents the highest frictional coefficient and wear resistance, and the surface with groove ridge topography presents the lowest frictional coefficient and wear resistance.