OBTAINING BORED COATINGS IN CONDITIONS OF SHS FOR DETAILS OF THE GAS DISTRIBUTION MECHANISM OF INTERNAL COMBUSTION ENGINES OF CARS

B. P. Sereda, D. B. Sereda, I. O. Babko, I. E. Zima, I. V. Belozor

Abstract


The article presents the results of obtaining protective coatings under SHS conditions. It has been established that the main criterion in determining the optimal technological parameters for obtaining protective coatings in the thermal self-ignition mode is the diffusion layer thickness (h, μm), the distribution of the diffusion element concentration over the layer thickness, the phase composition and layer properties (heat resistance, adhesive strength, corrosion resistance, wear resistance). The structure of the surface layers significantly depends on the composition of the saturating mixture, the choice of the coating temperature and the duration of the process. The main technological parameters affecting the formation of coatings in the thermal self-ignition mode are: ignition temperature (t*,ºC), maximum temperature (tm,ºC), isothermal holding temperature (t,ºC), isothermal holding time (τ, min) and heating rate
(v, C/min). After carrying out the borochromoalitivan layer, it has a characteristic needle-like structure. Boride needles form a continuous layer of borides with aluminum inclusions. The microstructures of the borochromo-aluminized coating for different exposure times have the following phases (Fe, Cr, Al)2B under which there is an α-solid solution of Cr, Al and B in iron. The studies carried out at the pilot plant, consist of the following main functional systems: reaction equipment, gas supply system, process parameters control and regulation system. The kinetics of the formation of borochrome coatings was studied at a process temperature of 1050ºC for 60 minutes. A borochromoalitization coating with a thickness of 45-80 µm was obtained. With a microhardness of 15-17 · 103 MPa. As a result of the study on the friction machine SMT-1 to 5:00 of the experiment, it was found that samples with different types of coatings wear 155-175·10-4 g /m2.

Keywords


self-propagating high temperature synthesis; coniferous forest; coverages; heat-tolerance; wearproofness

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DOI: https://doi.org/10.31319/2519-2884.34.2019.12

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Copyright (c) 2019 B. P. Sereda, D. B. Sereda, I. O. Babko, I. E. Zima, I. V. Belozor

ISSN (print) 2519-2884

ISSN (online) 2617-8389