Effect of Adsorbed Additive Layers to Hydrodynamic Lubrication Performances with 10nm-Level Clearance

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To investigate the friction properties of sliding surfaces under hydrodynamic lubricated condition, we designed a disk-on-disk friction tester. In the experiments, we used the disks with spiral grooves of hundreds nanometer depth on the surface to keep the two disks in parallel during the friction test by the generation of hydrodynamic pressure. We used poli-alpha-olefin mixed with palmitic acid and stearic acid as lubricant with oiliness additives. As a result, the friction coefficient under hydrodynamic lubrication became obviously lower when we used the additive-mixed lubricant than that when we used the lubricant without any additives.