SURFACE MODIFICATION OF MACHINE PARTS AND MECHANISMS IN THE CONDITIONS OF FRICTION AND WEAR

Abstract

The issues of surface modification of machine parts and mechanisms in conditions of friction and wear with and without oil further develops that work. The dependence of antifriction and friction on the special state of only the surface layers of friction parts is considered. It is revealed that the structural changes that occur in the surface microlayer of conjugate materials, the formation and destruction of secondary structures are responsible for the nature of the friction node. The authors propose to create on the friction surface such protective coatings that have properties and mechanism of action corresponding to secondary structures in order to be able to control the phenomena of antifriction and fractionality in the friction zone of conjugate parts. The aim of the study is achieved by processing iron-carbon alloys in the environment of superheated steam of aqueous solutions of salts. The optimal parameters of the technological process of forming coatings during vapor oxidation are selected. Laboratory tests of different chemical composition of the formed coating on the tribotechnical properties of friction steam were carried out. During the study, the authors concluded that by establishing a qualitative and quantitative relationship between the composition of oxide coatings and their tribotechnical properties, it is possible to change the conditions of the friction unit from antifriction to friction, using the same structural materials - ferrocarbon alloys. Thus, complex oxides, which differ in chemical composition and structure, which are coatings on ferrocarbon alloys, can significantly affect the thermomechanophysical processes that occur during operation and allow their renovation in the presence of lubricant and without it. Coatings formed on the surface of ferrocarbon alloys in accordance with the operating conditions can have both friction and antifriction properties.