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Hot-pressed Si3N4 ceramics containing CaO-Al2O3-AlN modifying additives

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Abstract

We have studied the influence of SHS aluminum nitride content (5–15%) and particle size on the fabrication conditions (hot pressing in a nitrogen atmosphere) of Si3N4-based ceramics containing CaO-Al2O3-AlN sintering aids. The results demonstrate that the reaction of Si3N4 with a eutectic calcium aluminate mixture during liquid-phase sintering leads to the formation of α-sialon-based intergranular phases: Ca m/z Si12 − (m − n)Al(m + n)O n N16 − n . The addition of AlN to starting mixtures contributes to a more complete conversion of the calcium aluminate sintering aid to Ca-α-sialon and influences the relationship between α-Si3N4 and β-Si3N4 in the ceramics. We examine the influence of synthesis conditions and the percentages of added calcium aluminates and aluminum nitride on the density, porosity, and bending strength of the ceramics. Thermogravimetric analysis data demonstrates that the Si3N4 + Ca-α-sialon composites obtained are stable to oxidation in air up to 1300°C.

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Authors and Affiliations

  1. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskii pr. 49, Moscow, 119991, Russia

    Yu. F. Kargin, A. S. Lysenkov, S. N. Ivicheva, S. V. Kutsev & K. A. Solntsev

  2. Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, ul. Akademika Osip’yana 8, Chernogolovka, Moscow oblast, 142432, Russia

    V. V. Zakorzhevskii & I. P. Borovinskaya

Authors
  1. Yu. F. Kargin
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  2. A. S. Lysenkov
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  3. S. N. Ivicheva
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  4. V. V. Zakorzhevskii
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  5. I. P. Borovinskaya
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  6. S. V. Kutsev
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  7. K. A. Solntsev
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Correspondence to Yu. F. Kargin.

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Original Russian Text © Yu.F. Kargin, A.S. Lysenkov, S.N. Ivicheva, V.V. Zakorzhevskii, I.P. Borovinskaya, S.V. Kutsev, K.A. Solntsev, 2012, published in Neorganicheskie Materialy, 2012, Vol. 48, No. 11, pp. 1291–1296.

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Kargin, Y.F., Lysenkov, A.S., Ivicheva, S.N. et al. Hot-pressed Si3N4 ceramics containing CaO-Al2O3-AlN modifying additives. Inorg Mater 48, 1158–1163 (2012). https://doi.org/10.1134/S0020168512110039

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  • DOI: https://doi.org/10.1134/S0020168512110039

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