Combustion synthesis of titanium carbonitride powders

摘要

Submicron powders of titanium carbonitride(TiC_(0.5)N_(0.5)) were synthesized in reactions of titaniumwith zinc dicyanide: Zn(CN)2 + 4Ti < 4TiC_(0.5)N_(0.5) +Zn. The reactions are exothermic enough to propagatein the reactants mixture in the form of self-sustaining,high-temperature synthesis (SHS). The final product isseparated and purified by dissolution of the onlybyproduct (zinc) in a diluted hydrochloric acid. Theuse of zinc dicyanide as the source of carbon andnitrogen causes that also titanium carbonitridecontains these elements in an atomic ratio of one. Thereaction temperature can be easily reduced by additionof zinc powder to the green mixture. Synthesis in thepresence of zinc gives TiC_(0.5)N_(0.5) powders containinground-shaped and unagglomerated particles.