Chemical modification of the friction surfaces and its evaluation based on the carryover effect measurements

A carryover effect, demonstrating a prolonged action of tribologically active additives in lubricating oils on the friction surfaces, was considered to be a result of surface chemical modifications. A new approach to carryover effect detection was suggested, and a method for its quantitative evaluat...

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Bibliographic Details
Published in:Tribology international 2000-10, Vol.33 (10), p.689-695
Main Authors: Parenago, O.P., Lozovoi, Yu.A., Zaimovskaya, T.A., Kuz'mina, G.N.
Format: Article
Language:English
Subjects:
Carryover effect
Chemical modification
Protecting films
Wear
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Summary:A carryover effect, demonstrating a prolonged action of tribologically active additives in lubricating oils on the friction surfaces, was considered to be a result of surface chemical modifications. A new approach to carryover effect detection was suggested, and a method for its quantitative evaluation using a four-ball tribometer was described. The carryover effect was measured for a series of tribologically active additives to lubricating oils at various test conditions. The carryover effect was shown to increase when higher axial loads and increased additive concentrations were used. A comparison of carryover effect values with critical loads ( P cr) for the studied additives allowed us to estimate the strength of protecting films being formed on the friction surfaces and the rate of their regeneration.
ISSN:0301-679X
1879-2464
DOI:10.1016/S0301-679X(00)00101-8