Aspects of Creating Multilayer Coatings by Plasma Spraying

In the work, taking into account the state of the issue in the field of applying multilayer heat-shielding and wear-resistant coatings, directions of research are substantiated. The objectives of the development are: improvement of powder materials containing zirconium dioxide partially stabilized with yttrium oxide for plasma deposition of heat-shielding coa-tings; improvement of powder materials containing oxide ceramics and nickel-based alloys for plasma deposition of wear-resistant coatings; development of technological parameters of plasma spraying and subsequent processing by the effects of compression plasma on the coating; analysis of the quality of protective coatings obtained using the optimal technology by studying their structure and physical and mechanical properties. The ZrO₂ – 7 % Y₂O₃ particles contain the predominant tetragonal Y_0.15Zr_0.85O_0.93 phase, monoclinic and cubic ZrO₂ phases, and the Al₂O₃–TiO₂–Ni–Cr–Al–Y–Ta composition contains the Cr_1.12Ni_2.88 phase of the nickel-based solid solution, the a-Al₂O₃, g-Al₂O₃ phases, and the orthorhombic phase of titanium oxide TiO₂ that contribute to its wear resistance. subsequent optimization of technological parameters for the process of plasma spraying of multilayer heat-shielding and wear-resistant coatings. Technological parameters for the process of plasma spraying of multi-layer heat-shielding and wear-resistant coatings are investigated with subsequent optimization. The optimization criteria were the utilization factor of the sprayed powder material and the structure of the coatings. The influence of the spraying distance on the values of operational characteristics of the formed plasma coatings on Al₂O₃–TiO₂–Ni–Cr–Al–Y–Ta has been studied. The obtained results of controlling the phase composition of coatings by varying the chemical composition of powder materials are presented. In the process of deposition, the differences in the phase composition of the formed material are the more significant, the more inhomogeneous the distribution of elements in the initial powder material. Tests have been carried out for cyclic testing in an oven at a maximum temperature within 1300 °C of heat-shielding coatings to determine their heat resistance. They proved the influence of the phase composition of the formed coatings on their ability to withstand high-temperature oxidation.

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9. Okovity V. A., Panteleenko F. I., Okovity V. V., Astashinsky V. M. (2021) Optimization of Coating Process from Cermet Powders by Plasma Spraying in Air. Nauka i Technika = Science & Technique, 20 (5), 369–374. https://doi.org/10.21122/2227-1031-2021-20-5-369-374 (in Russian).

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