Wear-resistant effect of micro-crystal silica fine particles as lubricant additive

The micro-crystal silica fine particles pulverized by ball-milling machine was used as lubricating oil additive to study its tribological effects.The tribological properties of 45 steel pairs lubricated under different kinds of lubricants were studied with AMSLER friction and wear tester.The surface topographies and composition of the worn surface of 45 steel rings were analyzed with scanning electron microscope(SEM) and EDAX.Experimental results show that a thin,relatively smooth self-repairing ceramic protective coating can be generated on the worn metal surface taking silica fine particles as oil additive under the cyclic action of wear and friction.Friction between the metal and metal turns to coating and coating.The protective coating avoids the direct contact between metal and metal,so as to decrease the wear loss of the sample,which has excellent anti-wear properties.Comparing with the base oil,friction coefficient is bigger than lubricated with silica fine particles as oil additive.