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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、孤岛型和犁沟 -孤岛混合型 3种特征形貌 .犁沟型和孤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 ,而孤岛型表面形貌的最大高度最小 ,空隙率最低 ;表面形貌的单一参数并不能准确反映蠕墨铸铁干摩擦过程 ,表面形貌的最大高度、沿高度方向的分布及摩擦表面的空隙率共同影响摩擦热的传导 ,从而影响摩擦学性能 ;具有孤岛型形貌特征的蠕墨铸铁摩擦学性能最好 ,具有犁沟型形貌的蠕墨铸铁摩擦学性能最差
The contact surface morphology of dry friction surface of compacted graphite cast iron was analyzed by three-dimensional surface topography test technique, and the relationship between the topography and the tribological properties of the friction surface was analyzed from the viewpoint of heat transfer.The results showed that the compacted graphite cast iron The dry friction surfaces mainly include furrow type, island type and furrow-island hybrid type.The topography of furrow type and island shape are asymmetrical along the direction perpendicular to the frictional surface, The maximum vertical height of the furrow surface topography, the highest porosity, while the maximum height of the island-shaped surface topography minimum, the lowest porosity; surface morphology of a single parameter does not accurately reflect the vermicular graphite Cast iron dry friction process, the maximum height of the surface morphology, the distribution along the height direction and the porosity of the friction surface affect the transmission of frictional heat, thus affecting the tribological properties; Tribological properties of vermicular graphite castings with island morphology topmost Well, the vermicular cast iron with furrow type morphology has the worst tribological properties