Home – Home – Jornals – Combustion, Explosion and Shock Waves 2021 number 4

The stages of chemical transformation in the combustion wave of an exothermic Fe₂O₃/Al/AlN mixture in nitrogen atmosphere is studied using an original method for terminating a combustion front. It is revealed that, in a stoichiometric Fe₂O₃/6Al mixture diluted with 35 % (wt.) AlN, the combustion front stops following the combustion of a 30 ÷ 40-mm mixture column. The zones of a stopped combustion wave are investigated by the local analysis methods. It is shown that the alumothermal reduction of iron (III) oxide to iron aluminide proceeds in stages via the formation of a (FeAl) _x O _{ydouble oxide having varying chemical composition. The final synthesis products include aluminum oxynitride, iron aluminide, and unreacted aluminum nitride.}