Abstract
Ultra-high-temperature composite materials HfB2-SiC containing 45 vol % SiC were prepared by spark plasma sintering. The behavior of a sample of this composition under exposure to a subsonic jet of dissociated air of a high-frequency induction plasmatron was studied; the total time was more than 30 min. Under certain test conditions, some regions of the sample were found to experience a rapid increase in temperature up to 2700°C. So, most of the surface area of the sample experienced exposure to temperatures up to 2500–2700°C for more than 15–18 min, while the rest of the surface had a temperature of 1700–1800°C during almost the entire duration of the experiment. The joint use of optical microscopy, scanning electron microscopy (with EDX analysis), X-ray powder diffraction, and X-ray computed microtomography 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. 11, pp. 1542–1556.
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Sevastyanov, V.G., Simonenko, E.P., Gordeev, A.N. et al. HfB2-SiC (45 vol %) ceramic material: Manufacture and behavior under long-term exposure to dissociated air jet flow. Russ. J. Inorg. Chem. 59, 1298–1311 (2014). https://doi.org/10.1134/S0036023614110217
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DOI: https://doi.org/10.1134/S0036023614110217