Fluids, Lubricants, Fuels and Related Materials.
Abstract
A new microtest for evaluation of the oxidative and thermal degradation of fluids and lubricants has been developed. This test, in conjunction with gel permeation chromatography, promises to provide a means for rapid determination of the extent of oxidative and additive degradation. The effects of base fluid viscosity, mean pore diameter, and additive concentration on the formation of thin films on a capillary wall are examined. Mean pore diameters of 0.2-1.2 microns are used. These thin films are shown to have properties different than those of the bulk fluid. Competition of additives is shown to have an effect on the formation and thickness of these surface films. Cellulose type filters as well as metal filters are used to provide the microcapillaries. Techniques which allow the accurate determination of wear debris from the four-ball wear tester have been developed. Preferential and competitive adsorption of polar species on the metal surface and the subsequent chemical reactions are shown to be the key process in boundary lubrication. Commercial phosphorus-containing antiwear additives are investigated using the experimental technique developed in this study. Surface temperatures are demonstrated to be a key parameter in boundary surface interactions both physically and chemically.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1976
- Accession Number
- ADA038066
Entities
People
- E. Erwin Klaus
- Elmer J. Tewksbury
- Emilio Cvitkovic
- Joseph Maskew
Organizations
- Pennsylvania State University