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On the mechanisms of solid-phase reversible chemical reactions in the MgO—Al2O3—SiO2 system

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Refractories and Industrial Ceramics Aims and scope

Abstract

Results of an electron microscope study of metastable intermediate compounds formed due to the incompleteness of solid-phase processes in shaping materials of a corundum-mullite-cordierite phase composition are presented. The identification of high-temperature clinoenstatite in contact with cordierite grains has made it possible to model and analyze some variants of mass transfer in the solid-phase reversible chemical reaction between mullite and spinel with the formation of corundum and cordierite. Common features in the mass transfer are determined for four reversible chemical reactions that occur in the subsolidus region of the MgO-A12O3-SiO2 phase diagram under a normal pressure. This has made it possible to find and substantiate the most probable mechanisms of these reactions and the mechanisms of synthesis of triple oxide compounds, i.e., sapphirine and cordierite.

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Authors and Affiliations

  1. Kharkov State Polytechnical University, Kharkov, Ukraine

    S. M. Logvinkov, G. D. Semchenko & D. A. Kobyzeva

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  1. S. M. Logvinkov
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  2. G. D. Semchenko
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  3. D. A. Kobyzeva
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Logvinkov, S.M., Semchenko, G.D. & Kobyzeva, D.A. On the mechanisms of solid-phase reversible chemical reactions in the MgO—Al2O3—SiO2 system. Refract Ind Ceram 39, 291–296 (1998). https://doi.org/10.1007/BF02765084

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