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Liquid chromatographic analysis of a formulated ester from a gas-turbine engine testSize exclusion chromatography (SEC) utilizing mu-Bondagel and mu-Styragel columns with a tetrahydrofuran mobile phase was used to determine the chemical degradation of lubricant samples from a gas-turbine engine test. A MIL-L-27502 candidate, ester-based lubricant was run in a J57-29 engine at a bulk oil temperature of 216 C. In general, the analyses indicated a progressive loss of primary ester, additive depletion, and formation of higher molecular weight material. An oil sample taken at the conclusion of the test showed a reversal of this trend because of large additions of new oil. The high-molecular-weight product from the degraded ester absorbed strongly in the ultraviolet region at 254 nanometers. This would indicate the presence of chromophoric groups. An analysis of a similar ester lubricant from a separate high-temperature bearing test yielded qualitatively similar results.
Document ID
19840046208
Document Type
Conference Paper
Authors
Jones, W. R., Jr. (NASA Lewis Research Center Cleveland, OH, United States)
Morales, W. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 12, 2013
Publication Date
October 1, 1983
Subject Category
NONMETALLIC MATERIALS
Report/Patent Number
ASLE PREPRINT 83-LC-1A-1
Distribution Limits
Public
Copyright
Other