Mechanism of Turbine Engine Lubricant Deposition.
Abstract
An investigation of the degradation and deposition mechanisms for inhibited polyol ester and diester lubricant basestocks is described. Basestocks trimethylolpropane triheptanoate and di(2-ethylhexyl) adipate containing antioxidants p, p'-dioctyldiphenylamine and/or phenyl-alpha-naphtylamine were studied in a dynamic thin-film condition with a moist-air atmosphere. Experiments were conducted with a device known as the rotating cylinder rig for the formation of controlled-thickness thin films (0.004 in.) at temperatures in the range of 350 to 550F. Analytical techniques for detection of lubricant or additive consumption and degradation products included gas liquid chromatography, principally, and gas chromatography/mass spectroscopy. Experiments showed that the antioxidants effectively retarded oxidation and deposition for both ester basestocks up to the time of complete additive consumption. A beneficial synergistic effect on deposition was noted at one concentration using the antioxidants in combination. Findings strongly suggest that an interaction between the ester oxidation products and system wearmetals is a significant factor in the deposition mechanism for both ester types. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1979
- Accession Number
- ADA072557
Entities
People
- J. P. Cuellar Jr.
Organizations
- Southwest Research Institute