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Influence of Aluminum Additives on the Content and Parameters of the Fine Structure of Titanium Silicon Carbide in SHS Powders

  • SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS
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Abstract

The dependence of the phase composition and parameters of a fine structure of titanium silicon carbide in powders formed by the self-propagating high-temperature synthesis on the aluminum concentration in the 5Ti/2Si/1C reaction mixture is investigated. The aluminum content is varied in a range of 0.1–0.4 mole fraction with the conservation of the total carbon content. It is established that the additives of aluminum not only affect the yield of titanium silicon carbide, but also promote the preferential formation of Ti5Si3 in synthesis products instead of TiSi2 identified in powders containing no aluminum. The introduction of a small amount of aluminum (0.1 mole fraction) leads to the formation of the Ti3Si1 – xAlxC2 solid solution and makes it possible to decrease the content of impurity phases in SHS powders by 6%. The silicon carbide concentration in SHS powders decrease at a higher aluminum content in the reaction mixture, while that of binary compounds (TiC, Ti5Si3, TiAl) correspondingly increases. No noticeable effect from the introduction of aluminum on the parameters of the crystal lattice of titanium silicon carbide in SHS powders is found in concentration limits of 0.1–0.25 mol %. A noticeable increase in parameters of a and c for Ti3Si1 – xAlxC2 (from a = 3.067 Å, c = 17.67 Å to a = 3.07 Å, c = 17.73 Å) with the conservation of the c/a ratio in limits of known values (c/a = 5.78) is observed only with the aluminum concentration of 0.4 mole fraction. The crystallite size of titanium silicon carbide depends, first and foremost, on the combustion parameters. At the same time, the deformation of the crystal lattice of Ti3Si1 – xAlxC2 in SHS powders increases monotonically with an increase in the aluminum content in the reaction mixture in the concentration range under study.

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Funding

This study was supported by the Russian Foundation for Basic Research and Belarussian Republican Foundation for Basic Research, project nos. 18-58-00031 Bel_a and T18P-101.

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Authors and Affiliations

  1. Roman Powder Metallurgy Institute, 220005, Minsk, Belarus

    T. L. Talako, A. I. Letsko, Yu. A. Reutsionak & A. P. Abramchuk

  2. Perm National Research Polytechnic University, 614013, Perm, Russia

    S. A. Oglezneva, M. N. Kachenyuk & A. A. Smetkin

Authors
  1. T. L. Talako
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  2. A. I. Letsko
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  3. Yu. A. Reutsionak
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  4. A. P. Abramchuk
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  5. S. A. Oglezneva
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  6. M. N. Kachenyuk
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Corresponding authors

Correspondence to T. L. Talako, A. I. Letsko, Yu. A. Reutsionak, A. P. Abramchuk, S. A. Oglezneva, M. N. Kachenyuk or A. A. Smetkin.

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On the 85th Anniversary of the Birthday of Academician V.N. Antsiferov

Translated by N. Korovin

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Talako, T.L., Letsko, A.I., Reutsionak, Y.A. et al. Influence of Aluminum Additives on the Content and Parameters of the Fine Structure of Titanium Silicon Carbide in SHS Powders. Russ. J. Non-ferrous Metals 60, 704–709 (2019). https://doi.org/10.3103/S106782121906018X

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  • DOI: https://doi.org/10.3103/S106782121906018X

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