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Information × Registration Number 0224U033097, (0123U102842) , R & D reports Title Development of multifunctional vacuum-arc coatings for cooled combustion chambers of rocket engines popup.stage_title Модернізація дослідно-промислової установки вакуумно-дугового осадження захисних покриттів, випробування її роботи, нанесення жароміцних покриттів на імітатор камери згоряння з мідних сплавів та дослідження їх структури й властивостей. Head Husarova Iryna O., Доктор технічних наук Registration Date 17-12-2024 Organization State Enterprise "Design Bureau "Southern" named after M.K. Yangel" popup.description1 Increasing the service life of combustion chambers of rocket engines based on the development of the scientific principles of modification of Ni-Cr, Fe-Ni-Cr coatings with nitrogen atoms during the vacuum-arc method of applying protective coatings and a comprehensive study of their structure and properties. popup.description2 The equipment of the vacuum chamber of the vacuum arc deposition installation for heat-resistant coatings on copper alloy combustion chambers was manufactured. The operation of the modernized vacuum arc deposition installation for heat-resistant coatings was tested. Vacuum arc deposition of heat-resistant nichrome coatings of ХН78Т on a copper alloy combustion chamber simulator was performed. The deposition was carried out in two modes: without nitriding and with nitriding. The calculated coating thickness was 44-122 microns and depends on the location of the sample in the combustion chamber simulator. The structure and properties of the heat-resistant coatings of the obtained samples were studied. The surface of the Ni-Cr coatings is homogeneous, without visible cracks and delaminations. The microstructure of the coatings in the cross section for all the studied samples consists of two main structural components: the main matrix of the condensed coating and the droplet component in the form of flat flattened drops, parallel to the substrate surface and close to spherical. In the area of introduction of volumetric drops, pores are observed. The microhardness of the samples obtained in the chamber without nitrogen is in the range of 383÷414 HV, with nitrogen – 544÷615 HV. The lowest values of wear indicators are observed in the samples that were placed in the narrowest place of the combustion chamber simulator; the complex wear coefficient was 1,5÷2,3×10-5 (MPa)-1. Adding nitrogen to the chamber led to an improvement in the wear resistance of the coating, the complex wear coefficient for samples identically placed in the simulator increased by 1,3-1,8 times. With the involvement of a co-performer, the phase composition, crystal lattice parameters, size of coherent scattering regions, crystallographic texture, and magnitude of internal stresses of nitrided and non-nitrided Ni–Cr coatings were investigated. Product Description popup.authors Bondar Dmytro M. Andrii Y. Borysenko Zhyla Serhii M. Kraiev Maksym V. Kurdiukov Serhii D. Leiter Ihor M. Nadtoka Volodymyr M. Spirin Yehor V. popup.nrat_date 2024-12-17 Close