Magnesiothermic SHS of boron carbide in conditions of temperature gradients View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2015-10

AUTHORS

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

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 (Tc) 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 Tc, 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. More... »

PAGES

216-219

References to SciGraph publications

  • 2015-01. SHS of boron carbide: Influence of combustion temperature in INTERNATIONAL JOURNAL OF SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS
  • 1977. Borides of the IVb Group in BORON AND REFRACTORY BORIDES
  • 2013-05. Ordering of carbon atoms in boron carbide structure in CRYSTALLOGRAPHY REPORTS
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.3103/s1061386215040093

    DOI

    http://dx.doi.org/10.3103/s1061386215040093

    DIMENSIONS

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