Abstract
Self-propagating high-temperature synthesis was used to study combustion of theZr-Nb-C system in argon, nitrogen, and a nitrogen-hydrogen mixture. In combustion in argon a deviation from the carbon stoichiometry facilitates the mutual dissolution of the formed phases and leads to the formation of single-phase complex carbides. The homogenizing role of hydrogen in the formation of the complex combustion products of theZr-Nb-C-N-H system was shown. It was found that there is competition among the effects of nitrogen, hydrogen, and carbon in this system. Concentration triangles of theZr-Nb-C system were constructed which show the evolution of the phase composition of combustion products depending on the reaction medium.
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