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SHS Metallurgy of Cr2AlC MAX Phase-Based Cast Materials

  • SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS
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Russian Journal of Non-Ferrous Metals Aims and scope Submit manuscript

Abstract

A review of publications on the structure, properties, fabrication methods, and application fields of materials based on the Cr2AlC MAX phase is given. It is noted that the most promising method of formation of such materials is self-propagating high-temperature synthesis (SHS), one of the directions of which is SHS metallurgy. A powder mixture of chromium III and chromium VI oxides of the analytical grade, aluminum of ASD-1 grade, and carbon is used as the base charge in investigations. The adiabatic combustion temperature and composition of final products is calculated using the THERMO special program. Experiments were performed in an SHS reactor with volume V = 3 dm3 under the initial pressure of inert gas (Ar) P0 = 5 MPa. The influence of the ratio of initial reagents on SHS parameters (the combustion rate, pressure increment, and yield of the target product), composition, and microstructure of target products is investigated experimentally. A scientific approach of the formation of cast materials in the Cr–Al–C system consisting of the Cr2AlC MAX phase and phases Cr3C2 and Cr5Al8 by the SHS metallurgy method is developed. The structural-phase states of target products are studied. It is established experimentally that, varying the content of initial reagents (aluminum and carbon) in the charge, it is possible to substantially affect the synthesis regularities, composition, and microstructure of final products. An increase in the content of the Cr2AlC MAX phase in the final product and a decrease in the Cr5Al8 content occur with an increase in the carbon content (above stoichiometric) in the initial mixture. An increase in the aluminum content (above stoichiometric) in the initial mixture leads to an increase in the content of the Cr2AlC MAX phase in the final product and a decrease in the content of the Cr3C2 phase.

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ACKNOWLEDGMENTS

We thank A.E. Sychev, acting head of Laboratory no. 8 at the Institute of Structural Macrokinetics of the Russian Academy of Sciences, for participating in the preparation of the material for the article.

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Authors and Affiliations

  1. Institute of Structural Macrokinetics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    V. A. Gorshkov, P. A. Miloserdov, N. V. Sachkova, M. A. Luginina & V. I. Yukhvid

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  1. V. A. Gorshkov
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  2. P. A. Miloserdov
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  3. N. V. Sachkova
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  4. M. A. Luginina
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  5. V. I. Yukhvid
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Correspondence to V. A. Gorshkov, P. A. Miloserdov, N. V. Sachkova, M. A. Luginina or V. I. Yukhvid.

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Translated by N. Korovin

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Gorshkov, V.A., Miloserdov, P.A., Sachkova, N.V. et al. SHS Metallurgy of Cr2AlC MAX Phase-Based Cast Materials. Russ. J. Non-ferrous Metals 59, 570–575 (2018). https://doi.org/10.3103/S106782121805005X

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  • DOI: https://doi.org/10.3103/S106782121805005X

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