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in this paper we consider the use of composite metal sprayed coatings for the improvement of the abrasion resistance levels in the working surfaces of friction couples. it is noted that pre-surface preparation, which provides the proper surface roughness that improves the adhesion of the coating to the base, is an important processing step prior to applying such coatings. As a method which enhances the adhesion strength of the sprayed coating, we consider the jet-abrasive (shotblasting) treatment to be ideal. the object of our research was the compression piston rings the internal combustion engine with a composite steel-molybdenum coating. such coatings provide high abrasion resistance for the rings of a good many large-sized engines. the research that has been carried out allowed the conclusion to be reached that the surface roughness depends on abrasive blasting modes, and that it impacts upon the strength of adhesion between the coating and the base. We proposed the jet-abrasive processing modes, which provide the required roughness to the working surface of the piston ring before spraying. keywords: composite coatings, wear resistant sprayed coating, surface roughness, adhesive strength, abrasive jet machining, piston rings. kulcsszavak: kompozit bevontok, kopásálló szórt bevonat, felületi érdesség, tapadószilárdság, abrazív vízsugaras megmunkálás, dugattyúgyűrű. Jüri Olt, DSc. Professor at estonian university of Life sciences. His main research areas are fundamentals of production enginering, materials cutting and design of technological machinery. Viacheslav V. MakSarOV, DSc. Professor at saint-Petersburg mining university, Head of Department of mechanical engineering since 2012 and Dean of electromechanical Faculty since 2015. spezializes in the field of dynamics of machining technological systems. Victor a. kraSnyy, PhD. Associate professor at saint-Petersburg mining university. specializes in the field of technological methods of increasing wear resistance of machinery parts.

Pre-surface preparation features when applying wear resistant composite sprayed coatings