The behaviors of two lithium lubricating greases were investigated under EHL circular contact through measurements of traction coefficients on a self-made rig in which the contact was continuously fed with fresh grease. The average values of Erying shear stress and shear modulus of the two lithium greases were obtained from traction experimental data using this rig. Based on the Evans-Johnson m...

For improving the tribological properties of bearing steel, friction structure surface microcavities filled MoS2/NiTi was prepared, and reduction mechanism interface analyzed. Results show that in is towed to worn surfaces form a lubricating layer. MoS2 can exert its interlayer sliding effect achieve lubrication under lower loads, but ability greatly reduced at heavy load. NiTi microparticles a...

The lubricating oils in each mechanical device are affected by shear forces. Polymers in lubricating oils engine, in particular, undergo many changes because of the influence of the applied forces. Awareness of these changes can help us to design optimal formulations. In this work, shear stability of four commercial was studied. Calculation of various parameters about viscosity in the enhancing...

Abstract The migration and distribution of lubricant oil in a rolling bearing strongly affect the elastohydrodynamic lubrication performance between balls rings. However, re-lubrication is highly dependent on design, which different from ball-on-disc model. This study directly observed film custom-made model-bearing rig, with an outer ring replaced by glass to allow full optical access. influen...

WC-(Fe-Mn-C) composites with ?-iron and ? + ?’ matrices were sintered then tested at sliding speeds in the range 7–37 m/s. The coefficient of friction was exponentially reduced as a function speed reaching its minimum 37 This behavior provided by mechanochemical formation iron tungstate FeWO4 on worn surfaces composite samples. lubricating effect did not, however, allow for reduction wear. surf...

Abstract Within this study, self-lubricating and triboactive (Cr,Al)N+Mo:S coatings were developed investigated for the deposition on components in a low-temperature physical vapor (PVD) hybrid process. Therefore, direct current magnetron sputtering (dcMS) high power pulse (HPPMS) PVD combined by using an industrial coating machine. Hereby, it was possible to deposit dense smooth triboactive, n...

The high frequency PWM voltage pulses from a two-level six-switch inverter produce common-mode in an electric machine’s windings, fraction of which appears on the machine shaft due to electrostatic (capacitive) coupling. When exceeds dielectric strength bearing lubricating grease, discharge machining (EDM) discharges occur within bearing, can lead premature failure. According pulsed theory, bre...