The given article considers the problem of machine parts working capacity increase based on the complex surface treatment. The authors proposed perspective method of surface treatment that it should be in the elastically plastic deformation of friction surfaces in an alternating magnetic field. In addition, a mathematical apparatus, which makes it possible to reveal the most rational treatment regime, was proposed.
The article deals with topical issues of studying the physical, mechanical and tribological parameters of the surface layer of machine parts subjected to laser processing. Various options for modifying mating surfaces are evaluated and analyzed. The data of microstructural analysis and indicators of wear resistance are presented. A theoretical model of the wear of heat-strengthened surfaces is proposed, explaining the mechanism for increasing their wear resistance as a result of homogenization of the microstructure of a special surface layer with increased bearing capacity. It is experimentally confirmed that the greatest wear resistance is observed in friction units during mutual modification of mating surfaces.
The paper describes the tribotechnical properties of thin-film coatings obtained by the tribotechnical modification of 40X grade steel with different organic and inorganic tribotechnical materials (natural inorganic and artificial polymers), as well as with composite materials based on vermiculite. Comparative tribotechnical investigations revealed that composites possess better tribotechnical properties than single-component materials. The most promising materials for the tribotechnical modification of steel friction surfaces are vermiculite-based nanostructured composites that provide minimal friction coefficient and high wear resistance under the conditions of boundary friction. The tribotechnical properties of polymagnesiumphenylsiloxane are a little worse than that of the materials based on vermiculite. Polymagnesiumphenylsiloxane and nanostructured composites based on vermiculite can be used as additives to motor oils and solid lubricants, as well as for the modification of friction surfaces during manufacturing or reconditioning of machine parts to increase their durability.
In the paper there is considered a problem of wear-resistance increase in parts operating in hydrogen environment. The dependence of friction surface wear taking into account their sub-roughness and hydrogen existence is shown. A technology for a friction couple wear-resistance increase is offered including surface layer granularity decrease, the reduction of hydrogen content in an inter-grain space and the introduction in the structure of parts surface layers the elements allowing filling up an inter-grain space. The results of comparative wear tests for different technologies for wear-resistance increase are shown. It is defined that the technology offered allows increasing wear-resistance in friction surfaces in machine parts. A method for account of hydrogen existence in an inter-grain space is offered and a reasonable method for obtaining a numerical value of a factor taking into account hydrogen presence used for theoretical computations.
Presents a scientifically based methodology for the selection and adjustment modes of the finish grinding of the friction surfaces of machine parts according to their required durability. Results over of experiments, characterizing influence of the modes of treatment on wearproofness of surface.
Formation of film antifriction coatings on the friction surfaces of machine parts
