Formation and Investigation of Plasma Powder Coatings Made of Oxide Ceramics Modified with High-Energy Effects

The paper presents results of studying structure and properties of multilayer composite coatings optimized for their composition based on zirconium dioxide materials used for deposition of plasma coatings on the models of elements for anti-meteor shielding screens. The influence of plasma jet parameters (current, distance of sputtering, consumption of plasma-forming nitrogen gas) and fractional composition of an initial powder on characteristics of two-layer composite coatings based on nickel-chromium-aluminum-yttrium and zirconium dioxide on the elements of protective screens has been analyzed in the paper. Optimization has been carried out on the basis of obtaining maximum coefficient of powder utilization. The investigations have made it possible to ascertain specific features of elemental and phase composition, surface morphology, microstructure multilayer composite coatings on the basis of a solid layer of metal oxides and a viscous transition sub-layer subjected to compression plasma flows. The investigations have been executed with the help of scanning electron microscopy, energy dispersive x-ray spectral microanalysis, and x-ray diffraction analysis. It has been shown on the basis of the obtained results that the effect of compression plasma flows on multilayer composite coatings leads to a modification of a near-surface layer with a thickness up to 15 μm that presupposes its melting and subsequent high-speed crystallization which together provide an increase in its density, decrease in porosity while maintaining the initial phase state. Liquid-phase processes in the molten phase of the near-surface layer permit to modify morphological properties of the surface which are associated with its smoothing and lowering of roughness.

plasma spraying, oxide ceramic materials, zirconium dioxide, process optimization, anti-meteor protection, powder use factor, coating adhesion to substrate, elemental composition, morphology, coating structure, modification under the action of compression flows

1. Kudinov V. V., Pekshev P. Yu., Belashchenko V. E., Kovalenko L. V. (1990) Application of Plasma Coatings. Moscow, Nauka Publ. 244 (in Russian).

2. Il'yushchenko A. F., Ivashko V. S., Okovityi V. A., Sobolevskii S. B. (1998) Thermal Protective Coatings Based on ZrO2. ?insk, Remika Publ. 128 (in Russian).

3. Antsiferov V. N., Shmakov A. M., Ageev S. S., Bulanov V. Ya. (1994) Gas-Thermal Coatings. Ekaterinburg, Nauka: Ural Publishing Company. 324 (in Russian).

4. Akishin A. I. (2007) Space Materials Science. Moscow, Skobeltsyn Institute of Nuclear Physics of Moscow State University. 209 (in Russian).

5. Kulik A. Ya., Borisov Yu. S., Mnukhin A. S., Nikitin M. D. (1985) Gas-Thermal Spraying of Composite Powders. Moscow, Mashinostroenie Publ. 261.

6. Akishin A. I. (2001) Effects of Space Conditions on Materials. N.-Y., Nova Science Publ. 199.

7. Safai S., Herman H. (1978) Plasma Sprayed Coating – their Ultramicrostructure. Advances in Surface Coating Technology. Paper 5 International Conference. London: Pub. Welding Institute, 1–14.

8. Eschnauer H., Kilp F., Mundinger K., Kuehn H., Stitz O. (1980) Pulverfoermige Keramische Werkstoffe Zum Plasmaspritzen [Ceramic Powers for Plasma Spraying]. Berichte der Deutschen Keramischen Gesellschaft, 57 (4–5), 94–98 (in German).

9. McClocklin R. S., Teal B. A. (1975) Thermal Spray Coatings for Computer Components. Journal of Vacuum Science Technology, 12 (4), 784–785. https://doi.org/10. 1116/1.568671.

10. Devoino O. G., Okovity V. V. (2015) Plasma Thermal Barrier Coatings Based on Zirconium Dioxide with High Thermal Stability. Nauka i Tekhnika = Science & Technique, (1), 35–39 (in Russian).

11. Panteleenko F. I., Okovity V. A., Devoino O. G., Astashinsky V. M., Okovity V. V., Sobolewski S. ?. (2015) Development of Technology for Application of Plasma Composite Coatings Based on Zirconium Dioxide for Spacecraft Systems. Nauka i Tekhnika = Science & Technique, (3), 3–9 (in Russian).

12. Okovity V. V. (2015) Selection of Oxides for Stabilization of Zirconium Dioxide while Obtaining Thermal Barrier Coatings. Nauka i Tekhnika = Science & Technique, (5), 26–32 (in Russian).

13. Okovity V. V., Devoino O. G., Okovity V. A., Astashinsky V. M. (2016) Technological Peculiarities of Thermal Barrier Coatings Based on Zirconium Dioxide. Nauka i Tekhnika = Science & Technique, 15 (3), 193–199 (in Russian). https://doi.org/10.21122/2227-1031-2016-153-193-199.

14. Okovity V. A., Panteleenko F. I., Devoino O. G., Okovity V. V., Astashinsky V. M., Hramtsov P. P., Chernik M. Y., Uglov V. V., Sobolevsk? S. B. Formation and Research of Multi-Layer Composite Plasma Oxide Coatings Based on Elements of Screen Meteroid Ptotection. Nauka i Tekhnika = Science & Technique, 15 (5), 357–364 (in Russian). https://doi.org/10.21122/2227-1031-2016-15-5-357-364.

15. Panteleenko F. I., Okovityi V. A., Devoino O. G., Astashinskii V. A. (2014) Optimization of Process Pertaining to Deposition of Ceramic Plasma Coatings on Model of Anti-Meteor Protection Screen Elements. Mashinostroenie i Tekhnosfera XXI Veka: Tezisy Mezhdunar. Nauch.-Tekhn. Konf., 15–20 sent. 2014 g., g. Sevastopol'. T. 2 [Mechanical Engineering and Technosphere of the 21st Century: Abstracts of International Scientific and Technical Conference, September 15–20, 2014, Sevastopol. Vol. 2]. Donetsk, 23–127 (in Russian).

16. Panteleenko F. I., Okovity V. A., Panteleenko E. F. (2017) Investigation of Plasma Two-Layer Composite Coatings of Zirconia-Nichrome. Aktual'nye Problemy v Mashinostroenii = Actual Problems in Machine Building, 4 (3), 100–105 (in Russian).

17. Okovity V. A., Panteleenko F. I., Okovity V. V., Astashinsky V. V., Hramtsov P. P., Cernik M. Y., Uglov V. V., Chimanskiy V. I., Cerenda N. N., Sobolewski S. B. (2017) Multilayer Composite Plasma Coatings on Screen Protection Elements Based on Zirconium Dioxide. Nauka i Tekhnika = Science & Technique, 16 (5), 422–431 (in Russian). https://doi.org/10.21122/2227-1031-2017-16-5-422-431.