Patent ID: 8709547

Claim:
A method of improving lubricity of a part subjected to wear or friction, the method comprising: applying to the part a film comprising: a first layer comprising a hard material selected from the group consisting of titanium nitride (TiN), chromium nitride (CrN), titanium carbide (TiC), chromium carbide (CrC), tungsten carbide (W 2 C), a tungsten carbide/carbon (WC/C) composite, alumina (Al 2 O 2 ), molybdenum sulfide (MoS 2 ), and a hydrogenated amorphous carbon material (a:CH); and a second layer comprising an oleophilic material; wherein a face of the first layer comprises a succession of pits and reliefs, the pits having a depth between 30 nm and 2 μm, the second layer is a continuous layer which conforms across the face of the first layer, a surface energy of the surface of the second layer is greater than 50 mN/m, and a thickness of the second layer is from 5 to 200 nm.