Experimental analysis reveals self-healing silicon carbide coatings withstand temperatures up to 1750°C, indicating durability for high-enthalpy environments.
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 1750C for 30 min. Mechanisms of self-healing of the coating under the influence of oxygen at high temperature were revealed.
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V.V. Antipov (2025) studied this question.
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