Producing ZrB₂-Based High-Temperature Coatings on Metallic Alloys by High-Speed Air–Fuel Sputtering

Abstract

The composition and structure of ZrB₂-based coatings with MoSi₂, SiC, and AlN additives obtained on metallic alloys by high-speed air-fuel sputtering is investigated. A possibility of using composite powders with a low content of the NiCr-binder (≤10 wt.%) due to intensive adhesion interactions of the components is demonstrated. It is established that the phase transformations triggered by high-temperature thermodynamically non-equilibrium processes, including oxygen-assisted ones, occur during the formation of coatings. The coatings with a hardness of ∼15 GPa and a porosity of ≤4% are characterized by a granular structure with no cracks and have a 50–120 μm thick ceramic layer and the same width of the layer of the interface interaction (∼10 μm) on the boundaries between the NiCr alloy and stainless steels.