摩擦条件对化学混杂复合镀层Ni-P-Gr-SiC摩擦性能的影响

摘要

研究化学复合镀层Ni-P-Gr-SiC的摩擦磨损性能,主要研究石墨复合量、载荷及转速对复合镀层摩擦性能的影响.采用SEM和EDAX对磨损表面和截面进行磨痕形貌和成分分析.结果表明,由于石墨和碳化硅两相颗粒的协同作用,复合镀层显示出良好的减摩性能和耐磨性.分析表明,摩擦试样的亚表层形成的富石墨机械混合层对摩擦体系保持良好的摩擦性能起到重要作用,同时碳化硅颗粒的承载作用有效避免富石墨机械混合层在摩擦剪切力作用下的断裂.%The friction and wear properties of the electrolessly-deposited Ni P-Gr-SiC composites were investigated.The effects of graphite content,load and rotation speed on the friction coefficient and wear resistance of the composite coatings were mainly investigated.The worn surface and cross section of the coatings were characterized by scanning electron microscopy and energy-dispersive X-ray analysis.The results show that the composite coatings reveal good antifriction and wear resistance due to the synergic effect of graphite and SiC particles.The formation of graphite-rich mechanically mixed layer (GRMML) on the surface of Ni-P-Gr-SiC coating contributes to the good tribological behavior of the wear counterparts and SiC particles play a load bearing role in protecting GRMML from shearing casily.