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Formation of the Ti2Alc Max-Phase in a Hydride Cycle From a Mixture of Titanium and Aluminum Carbohydride Powders

  • PHYSICAL METHODS FOR STUDYING CHEMICAL REACTIONS
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Abstract

The creation and development of new methods and technologies for obtaining MAX-phases, promising materials based on oxygen-free ceramics, which are in demand in modern materials science as structural materials, is an urgent task. The existing methods of obtaining them are rather complicated, energy-intensive, and multistage. It is of scientific and practical interest to develop viable commercial proposals that cost less and make it possible to manufacture MAX-phases in larger quantities. This paper presents the results of studies of the processes of the formation of the Ti2AlC MAX-phase in the hydride cycle (HC) using titanium carbohydrides TiC0.45H1.07–1.17 (the content of H2 is 1.97–2.17 wt %) with an HCP structure and TiC0.5H0.22–0.73 (the content of H2 is 0.44–1.48 wt %) with an FCC structure as the initial components The reaction TiC0.45–0.5H0.22–1.17 + 0.5Al → Ti2AlC + H2↑ is studied. The task of this study is to establish the effect of temperatures and the heating time on the phase composition and structure of the Ti2AlC MAX-phase. For the certification of samples, the following set of analysis methods is used: chemical, differential thermal, and X-ray phase. The microstructure of the samples is investigated on the scanning electron microscope SEM Prisma E. As a result of the research on the HC, a single-phase Ti2AlC MAX-phase is synthesized (a = 3.0553 Å, c = 13.6459 Å, c/a = 4.466, symmetry group P63/mmc). The Ti2AlC MAX-phase is formed in the HC by the solid-phase mechanism, in one technological stage, during heating at 1000°С for 0.5–1 h. The advantages of the HC method in the synthesis of the Ti2AlC MAX-phases regarding traditional methods, which allow us to simplify the technological process, reduce energy consumption, and improve quality, are shown.

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Funding

The work was supported by the Ministry of Education, Science, Culture and Sport of the Republic of Armenia under the Baseline Funding Project E-9.

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Authors and Affiliations

  1. Nalbandyan Institute of Chemical Physics, National Academy of Sciences of Armenia, Yerevan, Armenia

    S. K. Dolukhanyan, A. G. Aleksanyan, O. P. Ter-Galstyan, G. N. Muradyan, N. L. Mnatsakanyan, K. V. Asatryan & A. S. Mnatsakanyan

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  1. S. K. Dolukhanyan
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  2. A. G. Aleksanyan
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  3. O. P. Ter-Galstyan
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  4. G. N. Muradyan
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  5. N. L. Mnatsakanyan
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  6. K. V. Asatryan
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  7. A. S. Mnatsakanyan
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Correspondence to S. K. Dolukhanyan.

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Dolukhanyan, S.K., Aleksanyan, A.G., Ter-Galstyan, O.P. et al. Formation of the Ti2Alc Max-Phase in a Hydride Cycle From a Mixture of Titanium and Aluminum Carbohydride Powders. Russ. J. Phys. Chem. B 16, 76–83 (2022). https://doi.org/10.1134/S1990793122010043

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  • DOI: https://doi.org/10.1134/S1990793122010043

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