The evolution of microstructural and phase transformations during nitriding of mechanically preactivated vanadium disilicide powder is investigated by X-ray diffraction, chemical analysis, and transmission electron microscopy. It is established that, in the initial stage of nitriding (1000–1100°C), the phase formation is accompanied by the dispersion of near-surface zones of VSi2 particles and the formation of V2N and α-modification silicon nitride. With increase in the nitriding temperature, the phase formation is accompanied by the delamination of particles and the formation of mainly VN and silicon nitride of α- and α-modifications. Nitriding of a mechanically activated vanadium disilicide powder at 1400°C enables synthesizing a fine silicon nitride–vanadium nitride composite powder in a single process. The synthesized powder is formed as loose aggregates consisting of 50 nm particles.
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Translated from Poroshkovaya Metallurgiya, Vol. 54, No. 5–6 (503), pp. 3–10, 2015.
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Krushinskaya, L.A., Makarenko, G.N., Kotko, A.V. et al. Phase Formation During Nitriding of Vanadium Disilicide. Powder Metall Met Ceram 54, 253–258 (2015). https://doi.org/10.1007/s11106-015-9707-6
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DOI: https://doi.org/10.1007/s11106-015-9707-6