Synthetic lubricants are necessary to satisfy the physical property requirements for future lubricants of aircraft turbine engines. Boundary-lubrication data on the synthetic fluids are rather limited; consequently, the effects of a wide range of sliding velocities on boundary lubrication were studied.nSliding-friction data and surface-failure properties show that a number of synthetics including diesters, polyethers, a silicate ester, and a phosphonate ester as well as a. silicone-diester blend are more effective boundary lubricants at high sliding velocities than comparable petroleum oils. The blend of a diester in silicones, an alkyl silicate ester, and a compounded diester (containing lubrication additives) were more effective boundary lubricants at high sliding velocities than the comparable diesters from which the most widely accepted synthetic lubri-cants are made. A diester failed to lubricate nonreactive surfaces which indicates that the lubrication mechanism for diesters may involve chemical reaction with the lubricated surfaces.
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