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.

公开(公告)号：US20180298302A1

公开(公告)日：2018-10-18

申请号：US16010661

申请日：2018-06-18

Applicant: ExxonMobil Research and Engineering Company

Inventor： Beatrice M. GOODING ,  Alan M. SCHILOWITZ ,  Andrew R. KONICEK ,  Douglas E. DECKMAN ,  Michael R. DOUGLASS

IPC: C10M169/04 ,  C10M107/02 ,  C10M129/40 ,  C10M129/46 ,  C10M129/54 ,  C10M135/10 ,  C10M137/10

Abstract: A method for improving wear control, while maintaining or improving fuel efficiency, in an engine or other mechanical component lubricated with a lubricating oil by using as the lubricating oil a formulated oil. The formulated oil has a composition including a lubricating oil base stock as a major component, and a mixture as a minor component of (i) at least one metal salt of a straight chain carboxylic acid, wherein the metal is selected from the group consisting of palladium (Pd), silver (Ag), gold (Au), zinc (Zn), and combinations thereof, and (ii) at least one metal salicylate salt, wherein the metal is calcium (Ca), magnesium (Mg) or combinations thereof, wherein the molar ratio of the total metal concentration from the salicylate salt divided by the total metal concentration from the straight chain carboxylic acid ranges from 0.1 to 40. The lubricating oils are useful in internal combustion engines.

公开(公告)号：US20180298301A1

公开(公告)日：2018-10-18

申请号：US16010634

申请日：2018-06-18

Applicant: ExxonMobil Research and Engineering Company

Inventor： Beatrice M. GOODING ,  Alan M. SCHILOWITZ ,  Andrew R. KONICEK ,  Douglas E. DECKMAN ,  Michael R. DOUGLASS

IPC: C10M169/04 ,  C10M129/40 ,  C10M129/46 ,  C10M129/54 ,  C10M135/10 ,  C10M137/10 ,  C10M107/02

Abstract: A method for improving wear control, while maintaining or improving solubility and fuel efficiency, in an engine or other mechanical component lubricated with a lubricating oil by using as the lubricating oil a formulated oil. The formulated oil has a composition including a lubricating oil base stock as a major component; and at least one metal salt of a carboxylic acid, as a minor component; wherein the metal salt of the carboxylic acid contains no sulfur or phosphorus; wherein the metal is selected from the group consisting of palladium (Pd), silver (Ag), gold (Au), zinc (Zn), and mixtures thereof; wherein the carboxylic acid is selected from the group consisting of an aliphatic carboxylic acid, a cycloaliphatic carboxylic acid, an aromatic carboxylic acid, and mixtures thereof; wherein the molar ratio of (zinc+palladium+silver+gold)/phosphorus of said formulated oil is greater than 1.0. The lubricating oils are useful in internal combustion engines.