NTRS - NASA Technical Reports Server

Back to Results
Behaviors of Polymer Additives Under EHL and Influences of Interactions Between Additives on Friction ModificationPolymer additives have become requisite for the formulation of multigrade engine oils. The behavior of polymethacrylate (PMA)-thickened oils as lubricants in concentrated contacts under nominal rolling and pure sliding conditions was investigated by conventional optical interferometry. The PMA thickened oils behaved differently from the base oil in the formation of elastohydrodynamic (EHL) films. The higher the elastohydrodynamic molecular weight of the PMA contained in the lubricant, the thinner was the oil film under EHL conditions. The film thickness of shear-degraded PMA-thickened oils was also investigated. The behavior of graphite particles dispersed in both the base oil and the PMA-thickened oil was studied under pure sliding by taking photomicrographs. Many kinds of additives are contained in lubricating oil and the interactions between additives are considered. The interactions of zinc-organodithiophosphates (ZDP) with other additives is discussed.
Document ID
Document Type
Conference Paper
Sakurai, T.
(Tokyo Inst. of Tech. Tokyo, Japan)
Date Acquired
August 12, 2013
Publication Date
April 1, 1984
Publication Information
Publication: NASA Lewis Research Center Tribology in the 80's. Vol. 1
Subject Category
Nonmetallic Materials
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.
Document Inquiry

Available Downloads

There are no available downloads for this record.
No Preview Available