FeS固体润滑涂层的结构分析及磨损行为比较

MICROSTRUCTURES AND WEAR-RESISTANCE BEHAVIORS OF FERROUS SULFIDE COATINGS

新型固体润滑剂PeS涂层的优异减摩耐磨性能与制备工艺密切相关.利用低温离子渗硫和高速火焰喷涂的方法制备了FeS固体润滑涂层.在MM-200和QP-100磨损实验机上对比研究了这两种涂层的摩擦磨损行为.利用XRD分析了涂层的相结构,用SEM观察了涂层的表面、截面及磨面形貌,用划痕仪测定了涂层与基体的结合力.结果表明,离子渗硫FeS涂层的减摩性和耐磨性更好,而热喷涂层的抗擦伤性更佳,这是两种PeS涂层的组织结构不同所致.

Low temperature ion sulfuration and high velocity oxy-fuel (HVOF) sprayed processes were used to prepare the FeS solid lubrication coatings respectively. Their friction and wear behaviors were comparatively investigated on a MM-200 ring-on-block wear tester under dry condition and a QP-100 ball-on-disc wear tester using No.40 machine oil as lubricant. SEM equipped with EDX and XRD were employed to analyze the morphologies of the two kinds of FeS coatings, as well as their phase structures. The results show that the properties of friction-reduction, wear-resistance and anti-cuffing of two kinds of coatings are all superior to the same substrate. The friction-reduction and were-resistance of the ion sulfuration coating are better than those of the HVOF sprayed FeS coating, and the anti-scuffing of the sprayed FeS coating is better than that of the ion sulfuration coating. The difference of the tribological properties of two coatings can be attributed to their different forming mechanisms and coating structures. The ion sulfuration coating prepared in the vacuum furnace was formed through the diffusion and penetration of sulfurs into the substrate. The bond between coating and substrate is chemical bond. The coating is thin and successive. The sprayed FeS coating prepared in atmosphere was formed through the building up of FeS grains. It belongs to mechanical bond. The coating is thick and contains some impurities and pores.