公开(公告)号：US20190203144A1

公开(公告)日：2019-07-04

申请号：US16207553

申请日：2018-12-03

Applicant: ExxonMobil Research and Engineering Company

Inventor： Arben JUSUFI ,  Alan M. SCHILOWITZ ,  Aditya JAISHANKAR ,  Andrew R. KONICEK ,  Ko ONODERA

IPC: C10M137/10 ,  C10M135/18 ,  C10M169/04

CPC classification number: C10M137/10 ,  C10M135/18 ,  C10M139/00 ,  C10M169/04 ,  C10M2203/003 ,  C10M2219/068 ,  C10M2223/045 ,  C10M2227/066 ,  C10N2210/06 ,  C10N2220/082 ,  C10N2230/06 ,  C10N2230/56 ,  C10N2250/121 ,  C10N2260/04

Abstract: Methods are provided for lubricating oxygenated diamond-like carbon surfaces to reduce friction while reducing or minimizing wear on the surface. A diamond-like carbon surface layer having a surface ratio of oxygen to carbon of 1:15 or more can be lubricated using a lubricant oil that includes a molybdenum-based friction modifier additive, a tungsten-based friction modifier additive, or a combination thereof. The Mo-based friction modifier (and/or other friction modifier based on a Group VI metal) can be selected based on the Gibbs free energy of adsorption (ΔG) for the friction modifier on an oxygenated diamond-like carbon surface. Use of a Group VI metal-based friction modifier having a ΔG of adsorption with a sufficiently large magnitude can reduce friction at the surface of the oxygenated diamond-like carbon while causing a reduced or minimized amount of wear during lubrication.