Abstract
A new method to produce ultra-high-temperature ceramic composites under rather mild conditions (1700°C, 30 MPa, treatment time 15 min) was applied to synthesize a relatively dense (ρrel = 84.5%) HfB2–30 vol % SiC material containing nanocrystalline silicon carbide (average crystallite size ∼37 nm). The elemental and phase compositions, microstructure, and some mechanical properties of this material and also its thermal behavior in an air flow within the temperature range 20–1400°C were investigated. Using a high-frequency induction plasmatron, a study was made of the effect of a supersonic dissociated air flow on the surface of the produced ultra-high-temperature ceramic composite shaped as a flat-end cylindrical sample installed into a copper water-cooled holder. On 40-min exposure of the sample to the supersonic dissociated air flow, the sample did not fail, and the weight loss was 0.04%. Although the heat flux was high, the temperature on the surface did not exceed 1400–1590°C, which could be due to the heat transfer from the sample to the water-cooled model. The thickness of the oxidized layer under these conditions was 10–20 μm; no SiC-depleted region formed. Specific features of the microstructure of the oxidized surface layer of the sample were noted.
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Original Russian Text © E.P. Simonenko, N.P. Simonenko, A.N. Gordeev, A.F. Kolesnikov, E.K. Papynov, O.O. Shichalin, K.Yu. Tal’skikh, E.A. Gridasova, V.A. Avramenko, V.G. Sevastyanov, N.T. Kuznetsov, 2018, published in Zhurnal Neorganicheskoi Khimii, 2018, Vol. 63, No. 11, pp. 1465–1475.
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Simonenko, E.P., Simonenko, N.P., Gordeev, A.N. et al. Impact of a Supersonic Dissociated Air Flow on the Surface of HfB2–30 vol % SiC UHTC Produced by the Sol–Gel Method. Russ. J. Inorg. Chem. 63, 1484–1493 (2018). https://doi.org/10.1134/S0036023618110177
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DOI: https://doi.org/10.1134/S0036023618110177