Abstract
Ultra-high-temperature composite materials HfB2-SiC containing 10, 15, and 20 vol % SiC were prepared by spark plasma sintering. The behavior of the samples prepared under long-term exposure to subsonic dissociated airstreams of a high-frequency induction plasmatron was studied. The total test time per sample was 35–42 min. Under certain exposure conditions (which were dependent on the composition of a sample), some regions of the sample were found to experience a rapid increase in temperature up to 2700°C. These regions enlarged over time, so that most of the surface area of the sample experienced exposure to temperatures of up to 2500–2700°C for 19–38 min, while the rest of the surface had a temperature of up to 1800–1900°C during almost the entire duration of the experiment. The joint use of optical microscopy, scanning electron microscopy (with EDX analysis), and X-ray powder diffraction enabled us to study the microstructure and composition of a structurally complex oxidized layer.
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Original Russian Text © V.G. Sevastyanov, E.P. Simonenko, A.N. Gordeev, N.P. Simonenko, A.F. Kolesnikov, E.K. Papynov, O.O. Shichalin, V.A. Avramenko, N.T. Kuznetsov, 2014, published in Zhurnal Neorganicheskoi Khimii, 2014, Vol. 59, No. 12, pp. 1611–1632.
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Sevastyanov, V.G., Simonenko, E.P., Gordeev, A.N. et al. HfB2-SiC (10–20 vol %) ceramic materials: Manufacture and behavior under long-term exposure to dissociated air streams. Russ. J. Inorg. Chem. 59, 1361–1382 (2014). https://doi.org/10.1134/S0036023614120250
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DOI: https://doi.org/10.1134/S0036023614120250