Synthesis of TiC–NiCr Composite from Granular Mixture: Different Methods of Adding Binder Components

Abstract

The work investigated the modes of synthesis of titanium carbide with a nichrome binder from granular charges containing up to 30 wt % nichrome or a mixture of nickel and chromium powders taken in the same ratio as in the alloy. Using the conditions for the transition of combustion from conductive to convective mode, the impurity gas content in the studied mixtures was quantitatively assessed. It was shown that for mixtures of 0.6-mm granules, a safe conductive synthesis mode is realized. For charge of 1.7-mm granules, if a mixture of Ni and Cr powders was added to the initial sample, the convective combustion mode took place when Ti + C content was more than 90 wt %. When adding nichrome powder, the convective mode was caused by more than 80 wt % of Ti + C. Replacing the nichrome powder in the initial granular charge with mixture of Ni and Cr powders did not change the phase composition of the combustion products.