The production andapplication of self–fluxing surfacingalloys is a complex scientific and technical problem associatedwith the development of effective technologicalprocesses for their productionand the rationalization of compositions that ultimatelyimprove the performance properties of protective coatings. Toobtain wear–resistant coatingsby gas-flame surfacing, self-fluxing surfacing powdersbased on nickel, nickeland chromiumor cobaltcontaining boron andsilicon additives are often used- these are, as a rule, chemically complexmulticomponent systems includingscarce elements. Inthis regard, a promising direction for the development of repair production of critical machine partsand mechanismsis the development of scientific foundationsand technology for the production of high-entropy alloys. The scientific basis for the development of high-entropy alloyscan becreated on the basis of establishing patterns of formation of phase equilibrium lineson diagrams of the state of systems. It is based on them that it is possible to predict the rationalcompositions of new high-performancealloys and materialsmost effectively.Thus, the study is aimedat solving the problem of studying the physico-chemical and structuralfeatures of high-entropy alloys of the FeNiCrCuSiC system in order toestablish optimal compositions.Studies of the effect of temperatureand boronon the production of a high-entropy alloy of the FeNiCrCuSiC system were carried out by thermodynamic modeling using the HSC-6.0 software packagedeveloped by Outokumpu ResearchOy (Finland). The Equilibrium Compositions subroutine basedon the Gibbs minimumenergy principle was used for the calculation. The quantitative distribution of substances containingiron, nickeland chromium,depending on the temperatureat the lower (2%)and upper(5%) boundaries of the boron change is shown in the figure, fromwhich it can be seen thatborides, silicides andcarbides are formed in the system. It can be seen that a change in the amount of boronfrom 2to 5%of the mass of the systemleads to the development of chromium silicification. At the same time, the amount of Fe,Ni, Crdecreases. According to preliminary forecasts,when obtaining a self-fluxing surfacing powderbased on iron, an increase in the boron content contributes to the formation of strengthening compounds with a decrease in the melting point of the alloy [1-4].

Studies of the effect of temperature and boronon the production of self-fluxing surfacingpowder based on iron were carried out by thermodynamicmodeling using the HSC-6.0software package [1-3]developed by Outokumpu ResearchOy (Finland).

The Equilibrium Compositionssubroutine based on the Gibbs minimum energyprinciple was used for the calculation. Based on theprimary material obtainedusing the HSC-6.0 softwarepackage (Figure), it follows that the following substances are present in the systems, depending on the temperature and amount of boron: Ni2Si, Fe2B, Fe, Cr4C, Ni, Cr, Cu, FeB, Fe3Si, NiSi, CrB, Cr3C, Cr7C3, CrB2, Ni3B, CrSi, Cr3C2.