Nano-scaled metal powder improving tribological properties of lubricant
(1.Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)2.Department of Materials Science and Engineering,Nanjing University of Science and Technology, Nanjing 210094, China3.南京理工大学 材料科学与工程系, 南京 210094)
Abstract: Cu nanoparticles were fabricated by ball milling with the anhydrous alcohol as dispersant. The size and figure of Cu nanoparticles were characterized by X-ray diffractometry and transmission electron microscopy. The tribological properties of adding Cu and MoS2 nanoparticles to the pure grease were measured on MM-200 tester, compared with the single additive and pure grease. The results show the size of Cu nanoparticles is about 50 nm. The surface with lubricant added nanopowder as additive possesses a remarkable decrease in wear volume. The friction coefficient and wear volume of lubricant mixed with 5% copper and 30% disulfide molybdenum nanoparticles are 0.09 and 1.80mm3, respectively. This mixed additive can not only increase the ability of supporting heavy load but repair the microscopic channels and cracks on the wear surface. Under higher load and long period of time, this lubricant has the characteristics of self-repairing, occluding resistance and ability of enduring higher temperature.
Key words: nano-scaled metal powder； ball milling； friction and wear properties