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Lubricant Evaluation and Performance 2

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Final technical rept. 1 Jan 1991-12 Jul 1993

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Thermal and oxidative stability, deposition and foaming techniques were developed for predicting the performance of candidate 4 cSt lubricants, polyphenyl ether PPE, C-ether and other experimental fluids for use in advanced aircraft turbine engines. A novel sealed tube test was developed to study the rate of reaction in both liquid and vapor phase using only microliter quantities of the lubricants. Blending agents andor diluents were used to improve the low temperature properties and high temperature oxidative stability of PPE. In-line magnetic wear sensors were evaluated as condition monitoring devices for oil systems with sensitivity well below 5 micrometers. Microfiltration effect on wear was investigated with the results showing effective reduction in secondary wear. HP-DSC analysis technique was limited as an oxidative stability screening device for PPE but was effective in demonstrating differences among various PPE formulations. The tribological behavior of high temperature fluids was evaluated and compared in the boundary lubrication regime using various steel and ceramic specimens. A sliding three- ball-on-disk wear test device was developed for reducing sample size, controlling scar geometry and determining lubricant consumption rate and tribochemistry. The effect of soft and hard solid particulates on the fatigue and wear lives of rolling elements was investigated using a recently developed three-ball rolling test. High temperature lubricants, Stability, Coking, Foaming, Condition monitoring, Spectrometric oil analysis, Lubricant monitoring, Thermal analysis, Sealed tube oxidation test, Pumpability, Three-Ball-on-disk, Fatigue and wear test.

Subject Categories:

  • Organic Chemistry
  • Physical Chemistry
  • Polymer Chemistry
  • Lubricants and Hydraulic Fluids

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