MATH MODELING OF PROCESS OF PLASMA SPRAYING OF COATINGS BASED ON POWDER POLYMER MATERIALS

The paper proposes the concept of complex modeling of plasma spraying of coatings based on powdered polymer materials. A physical and mathematical description of the process is presented by dividing it into several main stages, complex modeling of all stages of plasma spraying with end-to-end data transmission from one stage to another. The plasma spraying process was divided into the following stages: generation of a plasma jet; introduction of the sprayed powder into the plasma jet, its heating and acceleration; interaction of the plasma jet and molten powder particles with the base. The temperature distribution of the open plasma jet is obtained by approximating experimental data for various types of plasma installations, plasma torch designs and their operating modes. The velocity of the powder particles was determined taking into account Newton’s law. The heating and melting of polymer particles during movement in a high-temperature gas jet was reduced to solving the Fourier-Kirchhoff differential equation of thermal conductivity in spherical coordinates. The formation of a polymer layer during plasma deposition is represented using the Madezhsky expression. The result of modeling the plasma process is information about the nature of deformation of molten powder particles upon impact with the base, the thickness of the deposited coating, its porosity, the strength of the adhesive compound, etc. The developed computer model makes it possible to optimize the technological modes of applying plasma polymer coatings. The software and mathematical complex is used to study and optimize the spraying process of epoxy coatings. When comparing the calculated and experimental data, a conclusion is made about the adequacy of the developed mathematical model. The technology of plasma spraying of powder polymer coatings is proposed for painting large-sized vehicles, including SkyWay transport (unimobiles), which is impossible by traditional powder spraying methods.

1. Plasma coated application / V.V. Kudinov, P.Yu. Pekshev, V. E. Belashchenko, etc. Moscow: Nauka, 1990:408. (In Russ.).

2. Lyasnikov V.N., Lyasnikova A.V., Dudareva O.A. Plasma spraying. Saratov: Izd-vo SGTU im. Gagarina Yu.A. 2016:620. (In Russ.).

3. Puzryakov A.F. Theoretical foundations of plasma spraying technology. Moscow: Izd-vo MGTU im. N.Eh. Baumana, 2008:320. (In Russ.).

4. Il'yushenko A.F., Shevtsov A.I., Okovityi V.A.,Gromyko G.F. Processes of formation of gasthermal coatings and their modeling. Minsk: Belaruskaya navuka, 2011:357. (In Russ.).

5. Meghwal A., Anupam A., Murty B.S., Berndt C.C.,Kottada R.S., Fng A.S.M. Thermal spray highentropy alloy coatings: a review. Journal of Thermal Spray Technology. 2020;29:857–893.

6. Gil'man A.B. Low-temperature plasma exposure as an effective method for modifying the surface of polymeric materials. Khimiya vysokikh ehnergii. 2003;1:20–26. (In Russ.).

7. Tsyrlin M.I., Rodchenko D.A. Formation of a network structure of a thermosetting polymer by plasma deposition. Izvestiya Natsional'noi akademii nauk Belarusi. Seriya khimicheskikh nauk. 1998;4:132−136. (In Russ.).

8. Tsyrlin M.I. Mathematical modeling of the heating process of polymer particles duringplasma spraying of coatings. In: The contribution of university science to the development of priority areas of industrial and economic activity, the development of economical and environmentally friendly technologies: Thesis. doc.

9. international scientific and technical Conf.November 21 – 24, 2000. Minsk: BGPA;2000:136. (In Russ.).

10. Zhukov M.F., Koroteev A.S. Theory of thermal electric arc plasma. Part 1. Methods of mathematical study of plasma. Novosibirsk: Nauka, 1987:278. (In Russ.).

11. Tsvetkov Yu.V., Panfilov S.A. Lowtemperature plasma in recovery processes. Moscow: Nauka, 1980:359. (In Russ.).

12. Lykov A.V. Theory of thermal conductivity. Moscow: Vysshaya shkola, 1967:599. (In Russ.).

13. Kutateladze S.S. Fundamentals of heat transfer theory. Novosibirsk: Nauka, 1970:659. (In Russ.).

14. Madejsky J. Solidification of droplets on a cold surface. Intern. J. Heat and Mass Transfer. 1976;19:1009–1013.

15. Tsyrlin M.I., Unitsky A.E. Curing of thermosetting powder materials using low-temperature plasma. Modern methods and technologies for developing and processing of materials: coll. of scientific apers. In 2 vol. V. 1. Materials Science. Minsk: FTI NAN

16. Belarusi, 2022:268–275. (In Russ.).

17. Spyrou E. Powder Coatings. Chemistry and Technology. Vincentz Network, 2012:380.

18. Kiil S. Anticorrosive Coatings. Coat. Technol. 2009;6:135–176