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.
Refractories and Industrial Ceramics – Springer Journals
Published: Nov 23, 2007
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