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Autori: Paleu, V., Bercea, I., Cretu, S., Bercea, M.
Editorial: Leaf Coppin, Lubrication Science, Leaf Coppin Publishing Ltd., 17 (2), p.173-184, 2005.
A mineral oil of low viscosity was additived with different concentrations of low-density polyethylene. The wear behaviour of the additived samples and the base oil was evaluated using a four-ball wear tester at constant speed and variable load. Steel and ceramic (silcicon nitride) were chosen for the balls. The scuffing resistance of the ceramic balls was higher than that of the steel balls. No scuffing appeared in the case of an upper steel ball in contact with lower ceramic balls. As far as the minimum wear-scar diameter on the lower balls was concerned, an optimum concentration of polymer added to the base oil was found from the experimental data, for both types of ball. For the system investigated, the optimum concentration was about 1.0% polyethylene.
Cuvinte cheie: masina cu 4 bile, bile din otel, bile din nitrura de siliciu, ulei mineral aditivat, polietilena cu densitate mica, gripare, rulmenti hibrizi // four-ball wear tester, steel balls, silicon nitride balls, additived mineral oil, low-density polyethylene, scuffing, hybrid bearings