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Convective Combustion of a Mechanically Activated Ti + C Mixture under Forced SHS Compaction

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Combustion, Explosion, and Shock Waves Aims and scope

Abstract

Effect of mechanical activation of components and external pressure on the combustion of a heterogeneous Ti + C mixture under SHS compaction is under study. It is shown that the presence of pressure (15 MPa) results in low-rate layered combustion (4–7 cm/s) and the absence of any external pressure causes unsteady combustion at a high burning rate (50–70 cm/s), namely surface-annular combustion and volumetric combustion, both based on convective heat and mass transfer. This paper proposes a mechanism for convective combustion at a high burning rate, based on the ignition of a heterogeneous mixture by a hot impurity gas released in a combustion wave and filtered through layered cracks and other macrodefects in the volume of charge compacts, which form during the pressing of powder mixtures. The mechanical activation of the reaction mixture components reduces the density and strength of the compacts and increases the efficiency of the formation of macrodefects. External pressure has the opposite effect as it prevents crack formation and the propagation of hot impurity gas through cracks. The consolidated samples of titanium carbide with a relative density of up to 95% are obtained in volumetric combustion.

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Authors and Affiliations

  1. Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, 142432, Chernogolovka, Russia

    Yu. V. Bogatov & V. A. Shcherbakov

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  1. Yu. V. Bogatov
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  2. V. A. Shcherbakov
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Correspondence to V. A. Shcherbakov.

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Translated from Fizika Goreniya i Vzryva, 2023, Vol. 59, No. 3, pp. 109-117. https://doi.org/10.15372/FGV20230310.

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Bogatov, Y.V., Shcherbakov, V.A. Convective Combustion of a Mechanically Activated Ti + C Mixture under Forced SHS Compaction. Combust Explos Shock Waves 59, 353–361 (2023). https://doi.org/10.1134/S0010508223030103

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