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  • Author(s):
    V. S. Buinevich, A. A. Nepapushev, G. V. Trusov, D. O. Moskovskikh, A. S. Rogachev, A. S. Mukasyan
    Abstract:

    The future of the aerospace industry is directly related to the development and modernization of the heat-loaded components of hypersonic aircraft: jet engines, nose tips and sharp leading edges of the wings, which are required to withstand ultrahigh temperatures (above 2000°C) caused by aerodynamic heating. The greatest practical interest for the aerospace industry is centered around ultra-high temperature ceramics based on borides, nitrides, carbides, carbonitrides and double transition met…

    Date Published:
    2019-01
    Record Visibility:
    Public
  • Author(s):
    L. C. Gallington, J. M. Pauls, T. Orlova, O. M. Miloserdova, N. V. Chapysheva, A. S. Rogachev, A. S. Mukasyan
    Abstract:

    Mechanochemical synthesis of hafnium nitride ceramic powder was accomplished through direct nitridation of hafnium particles in nitrogen atmosphere during high-energy milling in a planetary ball mill. The nitrogen content was measured and evaluated to determine the reaction kinetics for hafnium – nitrogen across a range of treatment durations. The observed reaction rates are notably faster than for conventional thermal treatment, and, for hafnium treated for 5 min in the ball mill, the onset …

    Date Published:
    2019-08
    Record Visibility:
    Public
  • Author(s):
    J. M. Pauls, N. F. Shkodich, A. S. Mukasyan
    Abstract:

    We report the results from the investigation of the mechanisms of self-sustained reaction in mechanically induced TiN/B nanocomposites. The exothermic displacement reaction, 3B + TiN → BN + TiB2, with an adiabatic reaction temperature of 1905 K, was initiated through two different means: localized thermal heating and mechanical stimulation by high-energy ball milling. Comprehensive studies strongly indicate that the chemical interaction in the system involves three main stages. Solid-state ma…

    Date Published:
    2019-04
    Record Visibility:
    Public