关键词: 吸附油膜, 薄层润滑, 石英微天平, Stribeck曲线, 矿物润滑油

Abstract: On the basis of thin film lubrication theory, the influence of fluid film (disordered film), ordered film and adsorbed film on tribological behaviors of lubricating oil in TFL was studied. The μ-L (friction coefficient versus load) curves of different viscosity and additive dosage were obtained by a high frequency reciprocating test rig and the adsorption capacity of additive on steel surface were measured by QCM-D. Based on Stribeck curve and thin film lubrication theory model, some conclusions can be drawn that (1) The μ-L curves and the parameters of L0 and μ0, resulted from high frequency reciprocating test rig with ball-disc contact, can be used to study tribological behaviors of lubricating oil in TFL. (2) Comparing with high viscosity base fluid, low one can enter into TFL regime under lower load and keeps lower friction coefficient in TFL.(3) The polar molecules in additive produce ordered adsorbed layer on steel surface to reduce friction coefficient. And in TFL, molecule polarity, layer thickness and saturation degree on steel surface probably influence lubricants tribological behaviors between the moving interfaces. While the further study would be focused on competitive adsorption of different additives, formation of dual- and/or tri-molecule adsorption layers, and other aspacts.