The formation of the multilayer plasma-based coating compositions of the oxide
The article presents the results of studying the process of deposition of multilayer composite plasma oxide coatings and optimizes the technological parameters of the deposition of multilayer plasma coatings based on hafnium oxide stabilized with yttrium oxide. A gradient plasma coating with a smooth change in physical and mechanical properties has been developed. The technologies of plasma spraying in air (APS) and in vacuum (VPS) were used. HfO2 with 15% Y2O3 was chosen as a ceramic powder for spraying, since after spraying this powder, the maximum amount of the tetragonal phase (up to 99%) remains in the coating, which has a major effect on the heat-shielding properties. Nickel-based alloy was selected as the sublayer. including 25 wt. % chromium, 10 wt. % aluminum and 0.5 wt. % yttrium.