基于纳米晶的低温离子渗硫层油润滑条件下摩擦磨损性能

Tribological Behavior of Low Temperature Ion Sulphurizing Layer Based on Nanocrystalline Under Oil Lubrication

利用预压力滚压技术在堆焊修复层表面制备纳米晶层,用低温离子渗硫技术在纳米晶层表面制备Fe S固体润滑膜。利用CETR-3型多功能摩擦磨损试验机考察油润滑条件下堆焊层表面纳米晶/Fe S复合层的摩擦磨损性能。采用SEM、EDS、XRD和XPS对摩擦磨损前后的硫化层微观组织结构进行分析。结果表明:与原始低温离子渗硫层相比,基于纳米晶的渗硫层厚度增加了40%,硫化层更为密实,基于纳米晶的低温离子渗硫层摩擦因数明显降低,磨损量降低40%左右,承载能力明显提高。耐磨减摩性能提高是纳米晶层作用的结果,基于纳米晶的硫化层硫化物含量较高,Fe S相所占比例较高,高硬度的纳米晶层为表面润滑层起到良好的支撑,对于减摩性能的提高起到积极作用。

Surface microstructure of the surfacing layer was optimized by refining the coarse grains to nanocrystalline by preloading rolling treatment （PLRT）. The solid lubrication film containing sulfide was prepared on the surface nanocrystallizated surfacing layer with the low temperature ion sulphurizing technology. The tribological behavior of the sulfide layer based on the nanocrystalline layer was investigated under oil lubrication by using CETR-3 tribo-meter. The microstructural features of the sulphurizing layers were analyzed by SEM, EDS, XPS, and XRD analysis techniques. Results show that the sulphurizing layers based on surface nanocrystallized samples are denser than those of the untreated samples, and the thickness of sulphurizing layers is improved by 40%. The friction coefficients and wear volume loss of the sulphurizing layers based on surface nanocrystallized samples are lower than those of the untreated samples. The wear volume are reduced approximately by 40%, the load-carrying ability are seriously improved. The advantages realized in the tribology properties of the sulfide layer based on the nanocrystalline samples, which may be attributed to the champion performance of the nanocrystalline surface layer. The content of sulfide in surface nanocrystalline sample and the proportion of FeS phase are evidently higher. The nanocrystalline surface layer with high hardness plays the to improve the tribology properties. effective bearing to the sulfide layer, which play a positive role