INCREASING THE WEAR RESISTANCE OF PLASMA COATINGS BY USING NANOSTRUCTURED COMPONENTS
DOI:
https://doi.org/10.35546/kntu2078-4481.2026.1.15Keywords:
plasma spraying, composite powders, nanostructured components, wear resistance, mechanochemical alloyingAbstract
The article addresses the relevant problem of improving the wear resistance of plasma-sprayed coatings by modifying the initial powder materials with nanostructured components. At the same time, the service properties of plasma coatings largely depend on the structure of the formed layer, its porosity, phase composition, and the uniform distribution of reinforcing components. One of the most promising approaches to improving the technology is the introduction of nanosized additives capable of significantly influencing the formation of the coating microstructure and enhancing its mechanical and tribological characteristics. The aim of the study was to determine the effect of nanosized aluminum oxide Al2O3 on the structure, microhardness, and wear resistance of plasma coatings produced from the powder Ni–Cr–B–Si–C system. For modification, Al2O3 nanopowder with a particle size of 50–70 nm obtained by a cryochemical method was used. The preparation of composite powders was carried out by mechanochemical alloying in an planetary mill. Plasma spraying was performed under conditions of laminar plasma jet generation, which reduced oxidation of powder particles during plasma transfer and contributed to stable coating formation. It was experimentally established that the introduction of nanosized Al2O3 in the amount of 0.1–5 wt.% significantly affects the coating formation processes and its performance characteristics. Thermal remelting at a temperature of 1050 °C ensures densification of the layer and an increase in microhardness. The most effective nanoparticle content was found to be 0.2 wt.% Al2O3, at which the maximum increase in microhardness and wear resistance was observed. An increase in the nanopowder concentration to 1.5–5 wt.% leads to higher porosity, pore coalescence along grain boundaries, and the creation of conditions for microcrack formation, which negatively affects the integrity of the coating. The obtained results confirm the feasibility of using nanostructured components as an effective method for improving the wear resistance of plasma coatings.
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