Calciothermic reduction of titanium dioxide and molybdenum trioxide under pressure of nitrogen gas

Resumo

Explored was the phenomenology of calciothermic reduction in model green mixtures containing metal oxides with strong (TiO₂) and weak (MoO₃) Me–O bonds. In case of high affinity metal (Ti), the process occurs in two stages: (1) combustion reaction of Ca with N₂ yielding calcium nitride and (2) calciothermic reduction of TiO₂ to give TiN. In case of low affinity metal (Mo), the above reactions proceed in parallel, without noticeable time delay.