Дослідження трибохімічної системи «бронза БрАЖ 9-4 - тіоамід - олива І-20А - сталь 45»

Abstract

В роботі досліджена трибохімічна система «бронза БрАЖ 9-4 - тіоамід - олива I-20A - сталь 45» та опосередковано встановлено утворення координаційних сполук купруму(ІІ) з дослідженими тіоамідами під дією механічного активування металевих поверхонь тертя та органічного розчинника диметилформаміду (ДМФА). Встановлено, що кращі протизношувальні властивості мають мастильні композиції, до складу яких входять досліджені тіоаміди (HL1–HL5) разом із ДМФА, який має високі електронодонорні (DNSbCl5) властивостіIn this work the tribochemical system "bronze - thioamide - oil I-20A - steel" has been investigated and the formation of coordinating compounds of copper(II) with thioamides has been established by mechanical activation of friction surfaces and organic solvent dimethylformamide (DMF). It has been established that better anti-wear properties have lubricating compositions comprising the investigated thioamides (HL1-HL5) along with DMF, which has high electron-donor (DNSbCl5) properties. In this case, thioamides, which include benzothiazole and amine fragments, have different effect on the anti-wear properties of the studied lubricant compositions. In the study of the friction-reducing properties of lubricating compositions with thioamides HL1–HL5, there is a "critical" point of inflection at a contact load of 16 MPa, to which the friction coefficient for all compositions increases rectilinearly. The subsequent increase in contact pressure leads to a straightforward increase of the friction coefficients, and only for those compositions which include thioamides with chlorine and bromine atoms in the N-aryl fragment, the friction coefficient unexpectedly decreases. The comparison of the obtained anti-wear and friction-reducing properties of lubricating compositions shows that in a number of cases, the improvement of tribotechnical properties does not coincide, which can be explained by different effects of additives in the investigated friction pair "bronze-steel"