Nano-PTFE: New entrant as a very promising EP additive

A little is reported on the potential of nano-PTFE in lubricating oils especially about its optimum concentration for best possible performance. This paper highlights the effect of varying nano-PTFE concentrations (0-6%) in 150 N API Group II oil on physical and tribological properties (based on Four-ball testers (Extreme Pressure-EP and Wear tester) and SRV Optimol).The results showed that nano-PTFE particles at 3 wt% can significantly improve the weld load (5 times), as well as anti-wear and friction reduction properties of the virgin oil. The topography and surface chemistry of the specimens were examined using SEM and EDAX analysis to examine the nature of protective surface film formed on the steel surfaces. Based on these observations, a possible mechanism was proposed to explain the deterioration in performance beyond 3% of nano-particles (NPs) with support from particle size measurement data by a Dynamic light scattering technique.193