Моделирование кинетики образования интерметаллидных сплавов в условиях самораспространяющегося высокотемпературного синтеза
Journal Title: Математичне моделювання - Year 2017, Vol 1, Issue 2
Abstract
THE MODELING OF THE KINETICS FORMATION OF INTERMETALLIC ALLOYS UNDER SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS Sereda B.P., Kruglyak I.V., Belokon Y.A., Belokon K.V., Zherebtsov A.A. Abstract When evaluating the possibilities of obtaining various inorganic compounds, including intermetallides, by the method of self-propagating high-temperature synthesis (SHS), kinetic analysis becomes more important, first of all, the determination of the critical conditions for the process. Therefore, the problem arises of determining the analytical equations of the temperature-time dependences of the formation of intermetallides in the Ni-Al system and their activation energy. The intermetallide systems of Ni-Al are chosen for the study. This system belongs to the group of intermetallic systems in which the adiabatic combustion temperature is equal to the melting point of the product formed (Tm = Tad). Analytic equations of the temperature-time dependences of the formation of intermetallides in the Ni-Al system and their activation energy are obtained on the basis of experimental methods for studying the kinetics of the interaction of intermetallic alloys under conditions of self-propagating high-temperature synthesis. An investigation of the laws of heat release during thermal autoignition made it possible to establish the following sequence of reactions: NiAl3 → Ni2Al3 → NiAl. It is established that for the reaction of the interaction of nickel and aluminum with the formation of the first crystals of intermetallides, the activation energy is 42.917 kJ. Also in the work, on the basis of the Johnson-Mel-Avrami-Kolmogorov model, the dependences determining the temperature and the synthesis time at which the required degree of chemical transformation is achieved are obtained. Varying the synthesis temperature, and hence the speed below the ignition limit, allows us to find the value at which the required degree of chemical transformation is achieved within the established synthesis time. Thus, at a temperature of maximum ignition of 530 °C, the total depth of the chemical transformation is reached in 220 s, the temperature decrease to 490 °C leads to an increase in the synthesis time by a factor of 2. References [16] Amosov A.P., Borovinskaya I.P., Merzhanov A.G. Poroshkovaya tekhnologiya samorasprostranyayushchegosya vysokotemperaturnogo sinteza materialov [Powder technology of self-propagating high-temperature synthesis of materials]. Moscow: Mashinostroenie-1, 2007, 567 p. (in Russian) [17] Sereda B., Zherebtsov A., Kruglyak I., Belokon Y., Savela K. and Sereda D. “The Retrieving of Heat-resistant Alloys on Intermetallic Base for Details of Gas Turbine Engine Hot Track in SHS Conditions”, Materials Science and Technology, vol. 3., pp. 2097-2102, October 2010. (references) [18] Sereda B.P., Kozhemyakin G.B., Savela K.V., Belokon Y.A., Ryzhkov V.G. Issledovanie vliyaniya fazovogo sostava Ni-Al splavov na fizikohimicheskie svoystva skeletnyih nikelevyih katalizatorovda [Investigation of the influence of the phase composition of Ni-Al alloys on the physicochemical properties of skeleton nickel catalysts], Metallurgiya, 2009, no. 20, pp. 112–117 (in Russian). [19] Belokon Y.O., Kharchenko O.V., Belokon K.V., Bashlya S.V. Termodynamichnyy analiz protikannya SVS-reaktsiy u systemi «Nikel'-Alyuminiy» [Thermodynamic analysis of the occurrence of SHS reactions in the "Nickel-Aluminum" system], Metallurgiya, 2016, no. 1(35), pp. 43–47 (in Ukrainian). [20] Cheylitko A. ”The influence of synthesis of the initial mixture and blowing agents on the formation of a porous structure”, EasternEuropean Journal of Enterprise Technologies, no. 5/8, pp. 35–38, 2015. (references) [21] Sereda B., Kruglyak I., Zherebtsov A. and Belokon Y. “The influence of deformation process at titan aluminides retrieving by SHS-compaction technologies”, Metallurgical and Mining Industry, no. 7, pp. 59–62, 2011. (references) [22] Sereda B., Belokon’ Y., Zherebtsov A. and Sereda D. “The researching and modeling of physical-chemical properties of Ni-base alloys in SHS conditions”, Materials Science and Technology, vol. 1, pp. 494–498, October 2012. (references) [23] Sereda B., Zherebtsov A. and Belokon Y. “The processes research of structurization of titan aluminides received by SHS”, Materials Science and Technology, vol.3, pp. 2069–2073, October 2009. (references) [24] Sereda B., Sheyko S., Kruglyak I. and Belokon’ Y. “Application of activation of substrate by aluminium and copper for increase of adhesive durability of sheetings received in self-propagating high-temperature synthesis conditions”, 10th International Conference on the Science and Technology of Adhesion and Adhesives, Oxford, UK, pp. 437–439, 2008. [25] Pochec E., Jozwiak S., Karczewski K. and Bojar Z. “Maps of Fe-Al phases formation kinetics parameters during isothermal sintering”, Thermochimica Acta, no. 545, pp. 14–19, 2012. (references) [26] Wang X., Sohn H. Y. and Schlesinger M. E. “Determination of the kinetics of TiAl3 formation from fine Ti and Al particles using differential scanning calorimetry”, Materials Science and Engineering, no. A 186, pp. 15l–155, 1994. (references)
Authors and Affiliations
Б. П. Середа, И. В. Кругляк, Ю. А. Белоконь, К. В. Белоконь, А. А. Жеребцов
Keywords
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