Vladimir State University named after Alexander and Nikolay Stoletovs, Vladimir, Russia

A. V. Aborkin, Associate Professor, Chair For Mechanical Engineering Technologies, Candidate of Technical Sciences, e-mail: aborkin@vlsu.ru

Aluminum alloy powders, multi-reinforced with fullerenes and aluminum oxide particles, were synthesized using high-energy mechanical processing in a planetary mill. The resulting powders were used for cold gas-dynamic spraying under low pressure. The structural and phase composition and tribological properties of the coatings were characterized. The coatings were demonstrated to have a fairly uniform microstructure consisting of densely packed deformed particles of the matrix alloy with micro- and submicroparticles of Al₂O₃ uniformly distributed throughout their volume. The proportion of ceramic particles transferred to the coating was shown to decrease with increasing their content in the powder mixture. Tribological tests under dry friction conditions revealed that with an increase in the Al₂O₃ concentration in the powder from 10 to 30% (wt.), the friction coefficients of the coatings decreased and stabilized. With a further increase in the Al₂O₃ content to 50% (wt.), a decrease in stability and an increase in the friction coefficient were observed. The lowest wear rate was observed for the coating obtained by spraying powder containing 30% (wt.) Al₂O₃. The nature of the coating wear varied depending on the increasing concentration of ceramic particles in the powder mixture. Moreover, a stable transition layer of mechanically mixed material formed in the coating obtained by spraying powder containing 30% (wt.) Al₂O₃, protecting the coa ting surface. This stabilized the friction coefficient and reduced wear compared to coatings created from powders containing 10 and 50%(wt.) Al₂O₃. Such coatings can be used to improve the tribological properties of the working surfaces of machine parts.
This work was carried out within the framework of a state assignment in the field of scientific activity of the Ministry of Science and Higher Education of the Russian Federation (topic FZUN-2024-0004, state assignment to VlSU).

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