摩擦副材料对二烷基二硫代氨基甲酸钼添加剂摩擦学特性的影响

选择等离子喷涂钼合金层、渗氮层以及镀铬层为摩擦副材料 ,以全配方矿物基发动机油 SJ/ 5 W- 30作为基础润滑油 ,研究了上述 3种摩擦副材料对油溶性二烷基二硫代氨基甲酸钼 (Mo DTC)添加剂摩擦学特性的影响 .结果表明 :Mo DTC的摩擦学特性与摩擦副材料类型有关 ;采用喷钼层、渗氮层及镀铬层作为摩擦副材料 ,Mo DTC均表现出减摩和抗磨作用 ,对渗氮层的减摩抗磨效果最佳 .X射线光电子能谱分析表明 :摩擦副材料类型对添加剂中的 Mo和 S的化学状态和相对含量均有影响 ;摩擦副材料类型不同时 ,Mo DTC摩擦学行为的差异与其在磨损表面形成的 Mo S2 以及 Mo O3 、Fe S和磷酸盐等物质的含量有关

Effect of Frictional Pair Materials on Tribological Behavior of Molybdenum Dithiocarbomate as an Additive

The effect of frictional pair materials on the tribological behavior of molybdenum dithiocarbomate (MoDTC) as an additive in a fully formulated petroleum based engine oil SJ/5W-30 was investigated on an Optimol-SRV test rig, by sliding Mo-sprayed coating, nitrided coating and Cr-plated coating against cast iron under the lubrication of the engine oil containing MoDTC. The worn coating and cast iron surfaces were observed with a scanning electron microscope, and the tribochemical function of the additive was examined with an X-ray photoelectron spectrometer. Results show that the tribological behavior of MoDTC is related to the type of the frictional pair materials. Namely, MoDTC decreased the friction and reduced the wear of all the three coating materials paired with cast iron. However, MoDTC exhibited the best friction-reducing and wear-resistant effect for the nitrided coating-cast iron pair. This was related to the different tribochemical function of the additive for different coating materials. In other words, the chemical state of Mo and S and the proportions of their compounds on the worn surfaces were dependent on the type of the frictional pair materials. It was thus supposed that the difference in the tribological behavior of MoDTC for different frictional pair materials was attributed to the content of MoS 2 and other wear-resistant compounds generated on the worn cast iron surfaces.