Abstract
Yield stress is an important property for identifying the suitability of a grease for a lubrication system. There is no consensus on the definition of the yield stress or its measurement method. Although fumed silica can be a suitable thickening agent, studying fumed silica–based lubricating greases has not received much attention. In this work, the authors performed different rheological tests on fumed silica–based lubricating grease to study its yielding behavior. The results revealed that the yield points obtained by most of these methods are roughly similar. The slight differences between these results have been explained as well. The microstructure of this grease is visualized using scanning electron microscopy (SEM) in cryo and non-cryo modes, demonstrating the fractal structure of the thickener and its corresponding structural hierarchy. Steady-state flow curves and microstructural analysis revealed some of the differences between this grease and other commercial greases.
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