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

摘要

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{sub}(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.