The influence of the hardness of the shaft journals and the chemical composition of tribotechnical organic-inorganic materials for forming coatings on steel on the performance properties of crankshaft bearings marine medium speed diesel engines

Abstract

The paper summarizes the results of studies of the operational properties of the tribo-tension "crank-shaft – bearing liner" of a marine medium-speed diesel engine. The main cause of crankshaft failures is the wear of the necks. To increase the durability of crankshaft bearings, it is proposed to form wear-resistant thin-film metal-ceramic coatings on the shaft necks, which are obtained by tribomechanical modification of the surface with organo-inorganic materials based on vermiculite.
It has been established that the following factors affect the wear rate of the parts of the tribo-tension "crankshaft – bearing liner" of a marine medium-speed diesel engine: mechanical properties: the modulus of elasticity of the surface layer has the greatest influence. To increase the wear resistance of the parts of the tribo-tension "crank-shaft – bearing liner" and, accordingly, its durability, it is necessary to form thin-film metal-ceramic coatings on the surface of the necks, providing optimal parameters of mechanical properties and surface structure.