Boundary Regime Friction of Commercial and Experimental Oils Used to Lubricate Steel at Elevated Temperatures
The reduction of parasitic friction in transportation, for example in engine/vehicle systems, through the use of friction modifiers introduced into engine oil, is of great importance for energy conservation. Several types of friction modifiers are available, and the precise mechanism by which these additives operate to reduce the coefficient of friction (COF) is not known. In addition, friction modifiers often compete with other additives at the surface. Producing a lubricating oil that provides low friction while performing the other necessary duties is challenging. Mechanisms governing friction behavior under boundary lubrication regime can be very complex; experimental measurements can provide valuable insights.