Abstract
Technologically viable principles have been developed for the preparation of the MAX phase Ti2AlC by self-propagating high-temperature synthesis (SHS) with a reduction step, using titanium dioxide. We have studied the influence of synthesis conditions (starting-mixture composition and ratio of reactants) on the composition, structure, and particle size of Ti2AlC powders. The results demonstrate that an excess of magnesium in the starting mixture leads to a decrease in the percentage of MgAl2O4 (spinel), and carbon deficiency in the starting mixture reduces the percentage of titanium carbide in the final product. The Ti2AlC powders prepared by SHS consist of agglomerates of layered particles differing in size: from coarse (several microns) to ultrafine and nanometer-sized particles. The composition of the powders was confirmed by chemical analysis, microstructural examination, and X-ray diffraction.
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Original Russian Text © V.I. Vershinnikov, D.Yu. Kovalev, 2018, published in Neorganicheskie Materialy, 2018, Vol. 54, No. 9, pp. 1003–1006.
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Vershinnikov, V.I., Kovalev, D.Y. Synthesis of the Ti2AlC MAX Phase with a Reduction Step via Combustion of a TiO2 + Mg + Al + C Mixture. Inorg Mater 54, 949–952 (2018). https://doi.org/10.1134/S0020168518090170
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DOI: https://doi.org/10.1134/S0020168518090170