METHOD OF APPLYING THERMAL-PROTECTIVE COMPOSITE COATING Russian patent published in 2017 - IPC C23C14/35 

FIELD: aviation.

SUBSTANCE: invention relates to spraying of heat shielding coating and can be used in aircraft engineering and other fields of industry in production of parts of turbine engines and plants. Method of applying thermal-protective composite coating containing zirconium oxide on surface of articles made from nickel alloy involves formation on surface of said article a composite gradient transition layer with a metal oxide structure and sputtering a zirconium oxide film to achieve required thickness. Formation of said gradient transition layer with a metal oxide structure is carried out by deposition of gradient transition layer containing metal phase based on nickel alloy, which corresponds to composition of said article surface, and a dielectric phase containing zirconium oxides of different stoichiometry, ratio of phases in gradient transition layer is varied with increase of share of oxide phase as film thickness increases. Method uses a magnetron system with two magnetrons, wherein first magnetron is used to sputter first target made from nickel alloy, and second magnetron is used to sputter second target made of zirconium with additives of stabilising elements. Gradient transition layer is formed by sputtering said targets. First, target sputtering is carried out in an argon atmosphere with provision of excess intensity atomic flux formed from said first target, over intensity of atomic flux from said second target with formation of solid metal layer. Method then includes sputtering in presence of oxygen with formation of zirconium oxide in sputtered film with non-oxidised nickel alloy. During sputtering, partial oxygen pressure is smoothly increased to 1.5⋅10^-3 Pa, and power of first magnetron, sputtering first target made from nickel alloy, is reduced up to its complete disconnection.

EFFECT: providing mechanical strength of coating, high heat resistance, as well as high adhesion and cohesion of coating on working surfaces of articles.

1 cl