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Study of the Behavior of a Particle of Diffusion-Alloyed Powder of Austenitic Steel in a Plasma Jet during Spraying

https://doi.org/10.21122/2227-1031-2025-24-3-181-191

Abstract

Currently, a significant number of parts and equipment break down as a result of wear processes. To solve this problem, restoration and strengthening technologies, in particular plasma spraying of coatings, are widely used. The material that allows plasma spraying to produce high-quality coatings is diffusion-alloyed powder made from 12X18H10 (12Kh18N9) austenitic steel. Since powders of this type have not been previously used for plasma spraying, we developed a theoretical model for the rupture of the crust of a refractory compound (iron boride), which was formed on the surface of a powder particle during diffusion alloying, due to the melting of the particle core during heating in a plasma jet. The model determines the condition under which the crust rupture occurs, which can ensure the spreading of the melt over the surface of the workpiece and the formation of a high-quality coating. To confirm the model, an experimental study of the powder particle behavior in a plasma jet during spraying was carried out. On the basis of the data obtained as a result of the experiment and the results of calculations according to the developed model, a mechanism for the behavior of a diffusion-alloyed austenitic steel particle in a plasma jet is proposed and requirements for powder particles are determined. It was found that the particles should be small enough so that when flying in the plasma jet they could be heated through and the iron core would melt. In our case the size of the diffusion-alloyed particles must be within 40–80 μm. Also, for the correct process of plasma spraying and the formation of a plasma-sprayed coating with low porosity, the outer boride layer must have a small thickness relative to the particle radius so that when the core melts in the plasma jet, the boride crust cracks and the melt begins to flow out. For particles with a diameter of 40–80 μm, this ratio is ensured by diffusion alloying during 3 hours.

About the Authors

O. G. Devoino
Belarusian National Technical University
Belarus

Minsk, Republic of Belarus



A. F. Panteleenko
Belarusian National Technical University
Belarus

Minsk, Republic of Belarus



B. B. Khina
State Scientific Institution “Physical-Technical Institute of the National Academy of Sciences of Belarus”, Belorussian State Aviation Academy
Belarus

Minsk, Republic of Belarus



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For citations:


Devoino O.G., Panteleenko A.F., Khina B.B. Study of the Behavior of a Particle of Diffusion-Alloyed Powder of Austenitic Steel in a Plasma Jet during Spraying. Science & Technique. 2025;24(3):181-191. (In Russ.) https://doi.org/10.21122/2227-1031-2025-24-3-181-191

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