ТРИБОТЕХНИЧЕСКИЕ ПРОЦЕССЫ ПРИ ФРЕТТИНГ-ИЗНОСЕ

Abstract

The work is devoted to obtaining and studying of tribotechnical characteristics during fretting wear of plastic metal films deposited on steel-45. The tribotechnical characteristics of the film coating (copper-containing film) deposited on the test surface of the specimens by the method of finishing antifriction nonabrasive treatment (FABO) have been studied. The analysis of the characteristics of these films in comparison with a deposited steel coating without a film is carried out. The antifriction characteristics of the brass film on the friction surface are investigated. The tribotechnical properties of friction surfaces during fretting wear are substantiated. As a result of the conducted research, the theory of abrasive wear was further developed. Recommendations on the choice of materials for obtaining coatings and films have been developed. New methods of preparing specimens for testing materials for wear resistance are proposed. As a result of the study, the distribution of oscillations dampening is obtained depending on the amplitude of the oscillations and the decrease in the molecular component of the friction coefficient. The ranges of values controlled in the experiment are substantiated, measuring devices for laboratory research are recommended. Optimal steel coatings have been selected. Based on the results of the research, three-factor graphs of the dependences of the coefficient of friction on the number of cycles and the amplitude of oscillations are constructed. It is established that over time, the alignment of the surfaces, the friction zone hardening, and the formation of wear particles occur. The process of wear occurs according to the scheme "hardening – lass of strength - destruction". It is proved that an increase in the load leads to an increase in the intensity of wear-and-tear. Simultaneously with an increases in the amplitude of the oscillations, the intensity of wear increases in accordance with the theory of limiting oxygen access to the contact zone during fretting. Theoretical foundations for the production of plastic metal films have been developed.