Abstract
Gas-thermal coating using suspensions and solutions of precursors allows to obtain promising functional coatings based on oxide ceramics with a controlled microstructure. CFD modeling of air plasma flows generated by the PNK-50 plasmatron in subsonic and supersonic operating modes (diameter of the nozzle 6, 8, 10 mm, gas flow rate of a plasma-forming gas 1 - 7 g / s, flow rate 500 - 2100 m / s). The interaction of single particles of the sprayed material with a size of 0.1 - 5 m with the boundary layer of gas on the surface of the substrate (base) in the process of coating formation was studied, the values of the speed of collision of particles with the base in various spraying modes were obtained. It is shown that the minimum particle size involved in coating formation is 0.5 - 1 m.
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