生物柴油中不饱和脂肪酸甲酯对内燃机油摩擦学性能的影响∗

摘要

为研究生物柴油中的不饱和组分对内燃机油的影响，在内燃机油中分别加入不同比例的不饱和脂肪酸甲酯和硬脂酸甲酯，通过四球摩擦磨损试验机考察不饱和脂肪酸甲酯对内燃机油减摩抗磨性能的影响，利用光学显微镜对磨损形貌进行分析。结果表明，不饱和脂肪酸甲酯在一定程度能够改善对内燃机油摩擦学特性，且随着不饱和脂肪酸甲酯含量的增大，内燃机油的减摩抗磨性能表现为逐渐增加的趋势；加有不饱和脂肪酸甲酯和硬脂酸甲酯的内燃机油氧化后摩擦学特性降低，且含不饱和脂肪酸甲酯的内燃机油氧化后摩擦学特性下降更为显著。%In order to study the effect of the unsaturated components in biodiesel oils on diesel oils,different percentages of unsaturated fatty acid methyl ester,stearic acid methyl ester were added into diesel oils respectively,and the effect of un⁃saturated fatty acid methyl ester on tribological behaviors of diesel oils was evaluated on a four⁃ball wear tester.The corre⁃sponding topographies of worn surfaces tested with different diesel oils were analyzed by optical microscopy.The results in⁃dicate that the unsaturated fatty acid methyl ester can improve the tribological behaviors of diesel oils to some extent.More⁃over,along with increasing of the unsaturated fatty acid methyl ester content,the friction reducing and anti⁃wear perform⁃ance of the diesel oils is shown the tendency of increasing gradually.The tribological behavior of the diesel oils added with unsaturated fatty acid methyl ester and stearic acid methyl ester is lowered after oxidation,especially the diesel oil with un⁃saturated fatty acid methyl ester has a more obvious decreasing in tribological behavior after oxidation.