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Foamed nitride-bonded silicon carbide refractories

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We obtained foamed silicon carbide insulating material with a nitride bond. The nitride bond is formed from a mixture of silicon nitride of theα- andβ-modifications upon reaction with nitrogen. The formation of the nitride commences at about 1200°, and is practically complete at 1450°; the rate of nitriding of the foam ceramic is much greater than in dense specimens. The material has a homogeneous phase composition which is an advantage compared with foamed silicon carbide containing a complex bond obtained in carbon fillings.

The foamed insulating brick based on nitride bond possesses a high thermal-shock resistance and structural strength at elevated temperatures. The strength is increased with an increase in the apparent density. The material is characterized by moderate mechanical strength, typical for silicon carbide refractories of this type [1, 3, 4].

The foamed silicon carbide brick with a nitride bond can be recommended for service at high temperatures in nonoxidizing atmospheres when substantial thermal-shock resistance is required.

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Literature cited

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Authors and Affiliations

  1. D. I. Mendeleev Moscow Institute of Chemical Technology, USSR

    I. Ya. Guzman, V. S. Pankratova & O. V. Aleksandrovskaya

Authors
  1. I. Ya. Guzman
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  2. V. S. Pankratova
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  3. O. V. Aleksandrovskaya
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Translated from Ogneupory, No. 7, pp. 48–51, July, 1970.

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Guzman, I.Y., Pankratova, V.S. & Aleksandrovskaya, O.V. Foamed nitride-bonded silicon carbide refractories. Refractories 11, 449–451 (1970). https://doi.org/10.1007/BF01290721

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  • DOI: https://doi.org/10.1007/BF01290721

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