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Magnesiothermic SHS of boron carbide in conditions of temperature gradients

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Abstract

Magnesiothermic SHS from reactive mixtures containing energy-producing additive, Mg(ClO4)2, in green mixtures was used to explore crystallization of boron carbide and its derivatives in a large SHS reactor in conditions of strong temperature gradients within the sample bulk. The addition of Mg(ClO4)2 increased a maximum combustion temperature (T c) up to 2500°C (instead of 2000°C without the additive). The presence of gasifying agent resulted in a non-uniform distribution of combustion products. Except for the central sample area with a maximum value of T c, the product exhibited the cell parameters corresponding to stoichiometric B4C. A two-phase material formed in the central zone was found to contain B13C2 and B25C4Mg1.42. This was explained by different temperature conditions in different areas of the sample bulk.

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Authors and Affiliations

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

    V. I. Ponomarev, I. D. Kovalev, V. I. Vershinnikov, D. Yu. Kovalev & S. V. Konovalikhin

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  1. V. I. Ponomarev
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  2. I. D. Kovalev
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  3. V. I. Vershinnikov
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  4. D. Yu. Kovalev
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  5. S. V. Konovalikhin
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Correspondence to V. I. Ponomarev.

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Ponomarev, V.I., Kovalev, I.D., Vershinnikov, V.I. et al. Magnesiothermic SHS of boron carbide in conditions of temperature gradients. Int. J Self-Propag. High-Temp. Synth. 24, 216–219 (2015). https://doi.org/10.3103/S1061386215040093

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  • DOI: https://doi.org/10.3103/S1061386215040093

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