Study On Tribological Behavior Of Nano-Sb Particles As Additive In Hydraulic Oil

Nano-material is one of the frontier fields of material science research and willhave wide application in future because of possessing many special properties.Nano-material will be more and more important in tribology field. That thenano-materials as additives apply to new types of lubricating material is one of theimportant research areas of the nano science. The antimony nanoparticles prepared byelectrochemical method were added to the hydraulic oil according to differentpercentage content. The tribological behavior of antimony powder as additive inhydraulic oil were evaluated by CFT-1material performance tester under different loadand friction velocity. The worn surfaces of the samples were analyzed by scanningelectron microscope and energy-dispersive spectroscopy, the lubrication mechanism ofSb nanopowder was also discussed.The main conclusions were as followed.1. The reciprocating friction and wear tests were taken by CFT-1materialperformance tester under different load, the tribological behavior of antimony powderas additive in hydraulic oil were studied under different conditions.The results showedthat it was needed to add different percentage content of nanometer antimony powdersto lubricating oil to achieve the best friction performance under different load. Whenfriction load was30N、60N、90N、120N, the corresponding optimum content was0.5%、0.3%、0.9%、0.5%. When friction load was120N, the reducing-friction andanti-wear properties of lubricating oil which contained0.5%content of nanometerantimony powders was best.2. The tribological behavior of lubrication oil which contained different contentsof antimony powders were evaluated under different friction velocity. It was resultedthat the friction coefficient increase after the first decrease with rise of the frictionvelocity on the lubrication conditions of pure hydraulic oil and hydraulic oil containing0.1%、0.5%of Nano-Sb Particles. When the friction velocity was0.0625m/s, thefriction coefficient of lubricating oil was least and the lubricating effect of lubricatingoil was best. When the hydraulic oil contained0.9%content of nanometer antimonypowders, the change of friction velocity had little effect on friction coefficient, thefriction coefficients of the worn surfaces were basically the same.3. The morphologies of the worn surfaces of the samples were observed on SEM,and the elemental distributions on the worn surfaces were determined by means of EDX. The lubrication mechanism of Sb nanopowder was also discussed. Because ofnanometer size effect and graphite-like crystal structure of Nano-Sb Particles, thehighly reactive Nano-Sb Particles interacted with the friction surface easily in theenvironment of high temperature and pressure. The highly reactive Nano-Sb Particlespenetrated or adsorbed on the friction surface to form a self-repairing film of low shearstrength. The self-repairing film which avoided the direct contact of two metalsexhibited wonderful resistance to wear and friction.