Abstract
Flameless combustion of 40% Fe2O3 – 40% RDX – 20% HDI (mix I) and 30% CoCO3 – 15% iron formate – 40% RDX – 15% HDI (mix II) systems was explored by time-resolved X-ray diffraction (TRXRD). In case of mix I, the reaction was found to proceed via the formation of FeO intermediate: Fe2O3 → FeO → Fe3O4. Variation in the extent of iron reduction was associated with dynamic temperature change and a reductant content of the reaction zone. The reduction proceeded as a solid-state reaction, without amorphization of the structure. The process in system II involved the formation of CoO and FeO intermediates. Further reduction – up to metals – takes place behind the combustion front and yields a mixture of nanosized Co, Fe, and Co0.7Fe0.3 particles. Exposure of hot reaction products – nano-sized Co and Fe – to the air leads to their self-ignition and formation of Co3O4 and Fe3O4, respectively.
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Mikhailov, Y.M., Aleshin, V.V., Zhemchugova, L.V. et al. Transformations of Iron (III) Precursors in a Wave of Flameless RDX Combustion. Int. J Self-Propag. High-Temp. Synth. 27, 162–166 (2018). https://doi.org/10.3103/S106138621803007X
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DOI: https://doi.org/10.3103/S106138621803007X