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Interaction of HfB2 + SiC + Cr Mixtures of Various Compositions with Carbon and Silicon Carbide Substrates

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Abstract—

Graphite and SiC substrates have been coated with two layers via slurry spraying: an inner layer, consisting of Cr–SiC, and an outer layer, consisting of HfB2–SiC–Cr. Coating growth has been shown to involve the formation of a Cr5Si3Cx-based intermediate liquid. The phase composition and surface morphology of the coatings have been studied by X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy. Single-layer coatings produced from Cr–SiC are tightly bonded to graphite substrates but peel off from SiC substrates. Bilayer coatings peel off from both graphite and SiC. Thermodynamic evaluation has made it possible to find the most plausible chemical reactions in the HfB2–SiC–Cr–C system at temperatures in the range 1300–1900 K. The experimental data have been shown to correlate with the calculation results.

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ACKNOWLEDGMENTS

We are grateful to A.V. Utkin, Cand. Sci. (Chem.), for useful discussions of our results and to A.V. Ukhina, Cand. Sci. (Chem), for collecting the X-ray diffraction patterns of the samples.

Funding

This work was supported by the Russian Federation Ministry of Science and Higher Education through the state research target for the Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, project no. AAAA-A17-117030310277-6.

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Authors and Affiliations

  1. Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, 630128, Novosibirsk, Russia

    D. A. Bannykh, V. V. Lozanov & N. I. Baklanova

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  1. D. A. Bannykh
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  2. V. V. Lozanov
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  3. N. I. Baklanova
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Correspondence to N. I. Baklanova.

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Bannykh, D.A., Lozanov, V.V. & Baklanova, N.I. Interaction of HfB2 + SiC + Cr Mixtures of Various Compositions with Carbon and Silicon Carbide Substrates. Inorg Mater 57, 343–350 (2021). https://doi.org/10.1134/S0020168521040026

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  • DOI: https://doi.org/10.1134/S0020168521040026

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