Zhukov O. Increasing the efficiency of manufacturing elements of turbo machine face impulse seals by applying functional coatings

The dissertation is devoted to the solution of the scientific and technical problem of ensuring the efficiency of face impulse seals (FIS) of turbomachines by improving the technology of manufacturing rings made of composite materials, which combine the mechanical strength of the substrate and the protective properties of coatings. An analysis of manufacturing technology and features of FIS operation was conducted in order to search for technological methods that allow to create functional coatings with specified operational properties on substrates of steels and alloys. The technique of directional choice of technology for ensuring the required quality of the working surfaces of the FIS rings, depending on the working conditions of the seal and the environmental properties, is developed. The technology of manufacturing FIS elements that work in corrosive environments and made of steel, nickel and bronze alloys has been improved due to the use of energy-efficient and environmentally friendly methods, alternative to chemical-thermal treatment. A new method of increasing the thickness of the layer of increased hardness by forming on the pre-strengthened cementing method by electro-erosion doping of the end surfaces of the FIS rings of the combined electro-erosion coatings is developed. Tribological researches and investigations of quality parameters of surface layers formed by the method of ion nitriding, condensed ion bombardment and carbonitration were carried out. The method of reducing the fretting corrosion for the contact surfaces of the sealing elements of the FIS has been developed. Technological recommendations for the production of FIS depending on the operating conditions and the pumped medium are developed. The economic effect of the introduction of the main provisions of work in production is 450 000 UAH. Key words: technological support, durability, face impulse seals, turbomachines, functional coatings, directional choice, electro-erosion alloying.