Authors: F.I. Panteleenko, V.A. Okovity, O.G. Devoino, V.V. Okovity, V.M. Astashinsky, O.A. Ostanin

Title of the article: Creation of multilayer plasma coatings from oxide ceramics

Year: 2025, Issue: 2, Pages: 47-56

Branch of knowledge: 2.5.6. Engineering technology

Index UDK: 621.793.7:621.762

DOI: 10.26730/1999-4125-2025-2-47-56

Abstract: This article analyzes the materials used, methods of obtaining and properties of multilayer plasma coatings operating at high temperatures and selects the main directions for studying the processes of their formation. Modern plasma coatings for high-temperature applications in most cases are a multilayer system that includes an outer ceramic layer and a heat-resistant metal sublayer, with intermediate ceramic-metal layers. The sublayer is needed to reduce the level of thermal stresses in the formed coating, which arise due to different thermal expansion coefficients for metal and ceramic materials. Intermediate ceramic-metal layers serve for monotonous alignment of physical and mechanical properties between the main layers. The ceramic layer creates the necessary heat resistance for the coating. However, with a fairly extensive study of plasma coatings based on zirconium dioxide, the issues of increasing the thermal stability of ceramic layers and reducing their gas permeability have not yet been completely resolved. To solve this problem, it is necessary to establish the regimes for applying layers that provide the required characteristics of protective coatings, to find effective ways to control the level of residual stresses and the content of pores in coatings, to develop technologies for obtaining multilayer protective coatings with a smooth transition of technological properties across the coating cross section from the metal base to the outer ceramic layer. The most commonly used methods for forming a ceramic layer of multilayer coatings operating at high temperatures are the processes of plasma spraying and electron beam evaporation. Recently, the plasma method has become more preferable because it significantly reduces the cost of coatings; allows for more rigid control of the coating composition, is characterized by higher productivity, and provides flexible control of the spraying process. High-quality multilayer plasma coatings operating at high temperatures must be created from materials that have a uniform chemical and phase composition over the entire cross-section of the powder, with strictly optimal dimensions and the necessary morphology, to create the maximum presence of the tetragonal phase in the formed coating while minimizing the grain size of the phase phases. inclusions.

Key words: multilayer plasma coatings ceramic layer heat-resistant metal sublayer intermediate ceramic-metal layers tetragonal phase monoclinic phase thermal cycling

Receiving date: 30.12.2024

Approval date: 22.04.2025

Publication date: 11.06.2025

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