Interaction of ferrosilicon with nitrogen in the presence of zircon and ilmenite concentrates in the process of self-propagating high-temperature synthesis

The equilibria in ferrosilicon-zircon-nitrogen and ferrosilicon-ilmenite-nitrogen systems are calculated. Nitriding of these compositions is investigated experimentally and the experimental and calculated data are compared. It is established that the combustion in the ferrosilicon-additive-nitrogen systems can be implemented with a zircon additive no larger than 60% and that of ilmenite no larger than 40%. The composition of the final product of the mixture with zircon includes Si₄N₄, Fe, Si₂N₂O, and ZrO₂; that with ilmenite includes Si₃N₄, Fe, Si₂N₂O, and TiN. The absence of ZrN in the former case contradicts the results of the calculation and the presence of TiN in the latter case corresponds to them.