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Prediction of High Temperature Grease Life Using a Decomposition Kinetic Model
ARMY TANK-AUTOMOTIVE RESEARCH AND DEVELOPMENT CENTER WARREN MI
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A decomposition kinetic model was developed based on thermodynamic theory, first-order reaction law, and PDSC and modified TGA techniques. This kinetic model is able to predict grease degradation life at various temperatures using their activation energy. In addition, the kinetic model was found to have a good correlation with the ASTM D 3527 test method that was simulated using a front wheel bearing system. The advantage of this kinetic model is that it can evaluate the grease thermal-oxidation stability and predict the high temperature grease decomposition life within a short period. It also appears that this kinetic model is potentially useful for grease screening, quality control, and base oil composition effect in thermal-oxidation stability. This paper details how to develop a decomposition kinetic model, its correlation to a bearing test, applications and findings.
APPROVED FOR PUBLIC RELEASE