IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Tribology Thursday Sessions
       Session TR-ThM

Paper TR-ThM7
Aging Evaluations of MoS@sub 2@-Containing Lubricants@footnote 1@

Thursday, November 1, 2001, 10:20 am, Room 132

Session: Tribological Surface Engineering for Lubrication & Wear Resistance
Presenter: D.E. Peebles, Sandia National Laboratories
Authors: D.E. Peebles, Sandia National Laboratories
M.T. Dugger, Sandia National Laboratories
W.F. McNamara, Sandia National Laboratories
J.A. Ohlhausen, Sandia National Laboratories
E.H. Sorroche, Sandia National Laboratories
Correspondent: Click to Email
Many solid film lubricants and self-lubricating materials utilize MoS@sub 2@ as the active lubricant phase. Oxidation of MoS@sub 2@ produces MoO@sub 3@ and surface sulfate species, which do not possess the same lubrication properties as MoS@sub 2@. However, the rate and mechanism for oxidation of MoS@sub 2@ is a strong function of the surrounding matrix material and the ambient oxidizing species. This work will review aging studies that have been performed for materials containing MoS@sub 2@ particles in polyimide and epoxy resin matrices. This work will illustrate the aging process from the viewpoint of chemical and performance modifications as a function of oxidation in a variety of atmospheric environments. Evaluations of the chemical state of the lubricant material are assessed by detailed surface chemical studies by x-ray photoelectron spectroscopy, while lubricant performance is assessed by pin-on-disk testing. The understanding of lubricant aging mechanisms obtained from these studies is being used to develop age-aware performance models for electromechanical devices. @FootnoteText@ @footnote 1@Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under Contract DE-AC04-94AL85000.