Heat-resistant coatings based on silicon carbide on graphite

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Abstract

A method for forming heat-resistant silicon carbide coatings on graphite products is proposed and investigated. The coating is formed by simultaneous occurrence of several chemical reactions between the silicon melt, carbon monoxide and the near-surface region of graphite at temperatures slightly exceeding the melting point of silicon. The formed coating has a thickness of up to several millimeters, has high mechanical strength and hardness. The samples were examined by various methods, including Raman spectroscopy, SEM. Thermal resistance of the obtained coatings was studied by testing in high-enthalpy subsonic air flows. It was shown that the coatings withstand such exposure at temperatures up to 1750°C for 30 min. Mechanisms of self-healing of the coating under the influence of oxygen at high temperature were revealed.

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About the authors

V. V. Antipov

Saint Petersburg State Technological Institute (Technical University)

Email: sergey.a.kukushkin@gmail.com
Russian Federation, Saint Petersburg

S. S. Galkin

Institute for Problems in Mechanics named after A. Yu Ishlinsky RAS

Email: sergey.a.kukushkin@gmail.com
Russian Federation, Moscow

А. S. Grashchenko

Institute of Problems of Mechanical Engineering RAS

Email: sergey.a.kukushkin@gmail.com
Russian Federation, St. Petersburg

D. M. Klimov

Institute for Problems in Mechanics named after A. Yu Ishlinsky RAS

Email: sergey.a.kukushkin@gmail.com
Russian Federation, Moscow

А. F. Kolesnikov

Institute for Problems in Mechanics named after A. Yu Ishlinsky RAS

Email: sergey.a.kukushkin@gmail.com
Russian Federation, Moscow

S. А. Kukushkin

Institute of Problems of Mechanical Engineering RAS

Author for correspondence.
Email: sergey.a.kukushkin@gmail.com
Russian Federation, St. Petersburg

А. V. Osipov

Institute of Problems of Mechanical Engineering RAS

Email: sergey.a.kukushkin@gmail.com
Russian Federation, St. Petersburg

А. V. Red’kov

Institute of Problems of Mechanical Engineering RAS

Email: sergey.a.kukushkin@gmail.com
Russian Federation, St. Petersburg

Е. S. Tepteeva

Institute for Problems in Mechanics named after A. Yu Ishlinsky RAS

Email: sergey.a.kukushkin@gmail.com
Russian Federation, Moscow

А. V. Chaplygin

Institute for Problems in Mechanics named after A. Yu Ishlinsky RAS

Email: sergey.a.kukushkin@gmail.com
Russian Federation, Moscow

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Supplementary files

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2. Fig. 1. Photographs of sample #2, (a) and (b) – before testing, (c) and (d) after testing. (a) and (c) – front side; (b) and (d) – back side.

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3. Fig. 2. Time dependences of the main plasma torch operating parameters and surface temperatures measured by the spectral ratio pyrometer, total radiation pyrometer and thermal imager in the experiment with sample № 2.

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4. Fig. 3. Thermal images of sample #2 at the 261st (a), 978th (b) and 1439th (c) seconds of testing and (d, d, e) – the corresponding temperature profiles along the lines marked in the figures (a, b, c).

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5. Fig. 4. Time dependences of the integral and spectral (at a wavelength of 0.9 μm) emissivity of the surface of the material of sample No. 2 during testing, as well as the temperatures from which they were obtained.

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6. Fig. 5. Photographs of the surface of sample No. 2 before exposure to a high-enthalpy air flow. a) edge of the sample at 1x magnification, b) middle of the sample surface at 5x magnification.

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7. Fig. 6. Photographs of the surface of sample No. 2 after exposure to a high-enthalpy air flow. a) edge of the sample at 5x magnification, b) middle of the sample surface at 5x magnification.

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8. Fig. 7. Raman spectra of the sample surface before and after testing (a), SEM image of a sample cleavage after testing (b), and data on the elemental composition determined by energy-dispersive spectroscopy (EDS) (c).

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