National University of Science and Technology “MISiS”, Moscow, Russia:

E. I. Patsera, Researcher, e-mail: patsera_yevgeniy@mail.ru

V. V. Kurbatkina, Leading Researcher

E. A. Levashov, Head of a Chair of Powder Metallurgy and Functional Coatings

Institute of Structural Macrokinetics and Materials Science of Russian Academy of Sciences, Chernogolovka, Russia:

L. M. Umarov, Senior Researcher

This work is devoted to the study of phase composition of Cr – Si – Al – As system ceramic materials area (rich with chromium), obtained by selfpropagating high-temperature synthesis (SHS) from preliminary mechanically activated charge. Elemental powders of chromium, silicon, aluminum and boron, processed in planetary mill, were used as starting components. As a result of mechanical activation of Cr, Si, Al, B powder mixtures, there was formed the structure, consisting of laminated agglomerate, which improves the contact between dissimilar particles and increases the reaction surface. There were defined the mechanical activation modes with lack of interaction between the components in activator, carried out after initiation in the SHS reactor. Dependences of temperature and burning rate on initial temperature for mechanical activation of mixtures were linear. The values of efficient activation energy of burning with minimal value of 44 kJ/mol were calculated for the composition 1 after 10 min of mechanical activation. The samples of ceramic materials were synthesized from the mixtures, activated by optimal modes. Analysis of phase composition of alloys used the computer methods of thermodynamic phase equilibrium calculations and experimental materials science methods. Experimental results were compared with the calculated ones. The data on the number of phases in alloys and their composition, obtained by computational and experimental methods, have satisfactory convergence. Both alloys contain 4 main phases: Cr₅(Si, Al)₃, Cr₂AlB₂Si, Al₈Cr₅Si, Cr_x(Si, Al)_y.

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