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Direct nitriding of spherical microparticles of carbonyl iron powder was carried out by means of chemical oven technique. Experimental selection of highly exothermic mixtures (“chemical ovens”) and nitrogen-containing additives was realized. It was shown that the nitriding products contain Fe3Nx where x ranges from 0.93 to 1.15 as a basis and are represented by spherical core–shell particles where the core is iron and the shell consisting of sub-microcrystals includes Fe, Fe3C, and FexN (x = 3 and 4). According to XRD-Rietveld method calculations, the maximum yield of FexN was 66 wt %.
Баринова et al. (Sun,) studied this question.