Patent ID: 6844068
Filing Date: 2005-01-18
Classification: F01L,F16C,Y10T

Abstract:
1. A system comprising: a slidable member; lubricating oil for an internal combustion engine in contact with said slidable member, the lubricating oil containing one or more oiliness agents; wherein the slidable member includes a substrate selected from the group consisting of silicon nitride and a metal; and a hard carbon-based film coated on a surface of said substrate, said hard carbon-based film having been applied by a process that produces in the surface of the film a sufficient number of polar groups to adsorb the oiliness agents from the lubricating oil to a degree to produce a lowered coefficient of friction; wherein the hard carbon-based film has a coefficient of friction of not higher than 0.07 and wherein the hard carbon-based film has a surface roughness, Ra, of not higher than 0.1 μm.