Abstract
Combustion syntheses of the (Ti-B-C) system have been investigated through measurements of its reaction heats and propagation rates. In order to clarify the reaction propagation characteristics, powder mixture compositions and the constituent carbon sizes were varied. As a result of the present work, it has been confirmed that the variation of the propagation rate related to the mixture ratios of the starting powders and greatly depended on carbon size. Three regimes categorize the present propagation characteristic: when the (Ti + 2B) component is predominant, the propagation rate decreases drastically with increasing the mole fraction of (Ti + C) component because the superiority of the reaction between Ti and B decreases. In the regime of the intermediate mole fraction, the propagation rate does not change as much. As the (Ti + C) component becomes predominant, the reaction between Ti and C overcomes the reaction with B and the propagation rate becomes large. In this regime, the large specific heat of boron might affect such a tendency.
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