Abstract
The paper discusses the influence of type dispersed phase on value of rolling contact fatigue of bearings lubricated with selected lubricating compositions. The compositions, which were produced on the mineral base oil were thickened of lithium stearate, calcium stearate, aluminum stearate, lithium complex soap and modified silica, montmorillonite, and polytetrafluoroethylene were evaluated.
 Were carried out the investigations of rolling contact fatigue (pitting) of bearings, which were lubricated of the compositions prepared on the above-mentioned thickeners. Then was evaluated the influence of various thickeners on changes of rolling contact fatigue. The tribological tests were carried out using T-03 four-ball machine under high load conditions.
 On the basis of obtained results it may be concluded, that used of thickeners such as: modified amorphous silica, montmorillonite and polytetrafluoroethylene to produce of lubricating compositions, positively affected on the change of rolling contact fatigue of tribosystems lubricated with the above-mentioned compositions in comparison to the compositions, when as a dispersed phase were used a soap thickeners.
Highlights
One of the components of lubricating grease is a thickener
At the probability occurrence of damage, which was 10% (L10) the time of occurrence of pitting for the lubricating compositions, in which the dispersed phase were a soap thickeners was : 47.52 min for the composition thickened of lithium stearate, 43.21 min for grease thickened of calcium stearate and 38.73 min for a composition, wherein the dispersed phase was aluminum stearate
The analysis of the results of rolling contact fatigue tests along with the analysis of the change in the structure of lubricants allows to state that the lubricating properties are the effect of the used thickeners and oxidation products and tribochemical reaction products with the friction pair working surface
Summary
One of the components of lubricating grease is a thickener It is a substance, which was provided a spatial structural arrangement and suitable rheological and tribological properties of prepared lubricating grease. From the type of thickener will depend a series of operational characteristics of lubricating greases such as: texture, mechanical stability, temperature stability, rheological properties or resistance on action of water and acids [2]. One of the generally used classifications of lubricating greases is a classification based on the type of the thickener. On this basis were stand out the greases: soap (e.g.: on the lithium stearate), mixed (e.g.: on the lithium-calcium soaps), inorganic (e.g.: on the silica or bentonite) and polymeric (e.g.: on the polyurethane or terephthalates) [3]
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