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Mullite formation from highly homogeneous mixtures of Al2O3 and SiO2

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Abstract

Mullite, 3A12O3 · 2SiO2, was synthesized by heat-treating homogeneous sol-gel-derived mixtures of A12O3 and SiO2 taken in stoichiometric amounts. To reduce the mullitization temperature, sols containing γ-AlOOH and SiO2 nanoparticles (2 to 20 nm) were used in the preparation of the mullite precursors. A few samples were made using the products of hydrolysis of aluminum salts instead of the γ-AlOOH sol. The process parameters determining the homogeneity of the precursor mixtures were revealed. The preparation conditions ensuring mullite crystallization at temperatures between 1200 and 1250°C were found. The results are discussed in terms of the reaction between A12O3 and SiO2 during mullitization.

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Authors and Affiliations

  1. Perm State Technical University, Komsomol’skii pr. 29a, 614600, Perm, Russia

    V. V. Vol’khin

  2. Institute of Technical Chemistry, Ural Division, Russian Academy of Sciences, ul. Lenina 13, 614600, Perm, Russia

    I. L. Kazakova

  3. Institut für Angewandte und Technische Physik, Technische Universität Wien, Wiedner Hauptstrasse 8-10, A-1040, Vienna, Austria

    P. Pongratz

  4. Institut für Mineralogie, Kristallographie und Strukturchemie, Technische Universität Wien, Getreidemarkt 9/171, A-1060, Vienna, Austria

    E. Halwax

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  1. V. V. Vol’khin
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  2. I. L. Kazakova
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  3. P. Pongratz
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  4. E. Halwax
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Vol’khin, V.V., Kazakova, I.L., Pongratz, P. et al. Mullite formation from highly homogeneous mixtures of Al2O3 and SiO2 . Inorg Mater 36, 375–379 (2000). https://doi.org/10.1007/BF02758084

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  • DOI: https://doi.org/10.1007/BF02758084

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