Dynamic Particle Generation/Shedding in Lubricating Greases Used in Aerospace Applications
ISSN: 1946-3855, e-ISSN: 1946-3901
Published August 03, 2018 by SAE International in United States
Citation: Galary, J., "Dynamic Particle Generation/Shedding in Lubricating Greases Used in Aerospace Applications," SAE Int. J. Aerosp. 11(2):73-84, 2018, https://doi.org/10.4271/01-11-02-0005.
The purpose of this study is to examine the phenomenon of Dynamic Particle Generation in lubricating greases that are used in a variety of critical Aerospace mechanisms. Particle Generation occurs in bearings, ball screws, and other mechanical devices where dynamic conditions are present. This should not be confused with outgassing as particle generation is unrelated to the pressure effects on a system. This is a critical factor in many systems as particle generation can contaminate systems or processes causing them to fail. These failures can lead to excessive costs, production failure, and equipment damage.
In this study, several greases made from Multiplyalkylated Cyclopentane and Perfluoropolyether base fluids were tested to evaluate their particle generation properties. This particle generation phenomenon was studied using a custom test rig utilizing a high precision cleanroom ball-screw to simulate true application conditions. The ball-screw was tested at speeds from 200, 1,200, and 2,400 RPM to illustrate the effect of speed on the particle generation across different applications. This article will show the tendencies of different lubricant chemistries to generate particles and which ones present advantages of improved durability and environmental cleanliness for critical processes and applications.