Abstract—
This paper reports results on self-propagating high-temperature synthesis of cast materials in the Mo–Al–C system. Experiments were carried out in a 3-L reactor at an argon pressure p = 5 MPa. The starting mixture consisted of molybdenum(VI) oxide, aluminum (ASD-1), carbon (graphite), and aluminum oxide (alundum) powders. It has been demonstrated that, varying the percentages of the components in the starting mixture, one can influence synthesis parameters and the phase composition and microstructure of the final products. At the stoichiometric composition of the starting mixture calculated for the Mo3Al2C phase, not only the required phase but also molybdenum aluminides and carbides were obtained in experiments. Combustion of the starting mixture was accompanied by scatter of the reactants and final products from the crucible. Dilution of the starting mixture with Al2O3 inert additions has been shown to increase the percentage of the required phase Mo3Al2C in the synthesis products. The largest percentage of Mo3Al2C in the ingot was reached at 20% Al2O3.
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ACKNOWLEDGMENTS
In this study, we used equipment at the Distributed Shared Research Facilities Center, Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences.
Funding
This work was supported by the Russian Federation Ministry of Science and Higher Education through the state research target no. FFSZ-20022-0009 for the Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, state registration no. 1021071612847-0-1.4.3.
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Kovalev, D.Y., Gorshkov, V.A. & Boyarchenko, O.D. High-Temperature Synthesis of Mo3Al2C-Based Materials via Combustion of MoO3 + Al + C + Al2O3 Powder Mixtures. Inorg Mater 58, 939–947 (2022). https://doi.org/10.1134/S0020168522090084
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DOI: https://doi.org/10.1134/S0020168522090084