Abstract
The structure as well as the phase and granulometric compositions of the submicron-sized heterophase HfB2–34 at % HfC powders fabricated by mechanical activation assisted self-propagating high-temperature synthesis from (Hf + B + C) mixtures were studied. It was demonstrated that HfB2–HfC powders can be produced from (Hf + B + C) mixtures by mechanochemical synthesis in a planetary ball mill (centrifugal factor, 60 g) during more than 15 min. The SHS product with composition HfB2–34 at % HfC consisted of a combination of highly porous agglomerates sized 5–100 µm, which can be easily broken into composite HfB2–HfC particles sized 1–10 µm. Important that each composite particle of powder have a heterophase structure which consists of HfB2 grains sized 0.5–2.0 µm and equiaxial HfC grains sized 0.3–1 µm. Impurity oxygen content in the SHS products did not exceed 0.29 wt %. Milling of the SHS product allowed to obtain the HfB2–34 at % HfC powder characterized by the average particle size of 4 µm with heterophase submicron-sized microstructure and oxygen content of 0.72 wt %.
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This work was supported by the Ministry of Science and Education of the Russian Federation within the framework of the state assignment (project no. 0718-2020-0034).
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Zaitsev, A.A., Potanin, A.Y., Pogozhev, Y.S. et al. Mechanical Activation Assisted Self-Propagating High-Temperature Synthesis of HfB2–HfC Composites. Int. J Self-Propag. High-Temp. Synth. 32, 157–168 (2023). https://doi.org/10.3103/S1061386223020073
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DOI: https://doi.org/10.3103/S1061386223020073