不同载荷和温度下碳烟对柴油机油摩擦学性能的影响

在SRV IV摩擦磨损试验机上,采用球-盘接触方式,考察了不同碳烟浓度的柴油机油在不同载荷和温度下的摩擦学特性,借助三维表面形貌仪、扫描电子显微镜及能谱仪、拉曼光谱探讨了由于载荷或温度改变引起含碳烟柴油机油摩擦学性能发生变化的原因.结果表明:当柴油机油中碳烟质量分数为5%时,当载荷或温度升高引起含碳烟柴油机油的摩擦学性能出现突变.突变表现为摩擦系数升高,磨损剧烈增加.分析认为,碳烟含量较高时,温度或载荷的升高容易引起润滑油膜破裂,出现乏油润滑,导致磨损加剧,摩擦系数升高.

Effect of Load and Temperature on Tribological Properties of Soot Contaminated Diesel Engine Oil

The influences of load and temperature on tribological properties of soot contaminated engine oil was investigated by using ball-disc reciprocating mode on the SRV IV oscillating reciprocating friction and wear tester.With the assistance of scanning electron microscopy/energy-dispersive spectrometry,3D surface profilometer and Raman,the worn steel surfaces under lubrication of soot contaminated engine oil at several loads and temperatures were analyzed.Results indicate that for lubricating oil with 5% diesel soot,"friction coefficient spike" was found when either load or temperature increased and it produced locally high wear.The rupture of oil film and starvation of lubricating oil at tribointerface were induced by variations in temperature and load.