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

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 cordieri...

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Bibliographic Details
Published in:Refractories and industrial ceramics 1998-07, Vol.39 (7-8), p.291-296
Main Authors: LOGVINKOV, S. M, SEMCHENKO, G. D, KOBYZEVA, D. A
Format: Article
Language:English
Subjects:
Aluminum oxide
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Chemical reactions
Cordierite
Corundum
Exact sciences and technology
High temperature
Magnesium oxide
Mass transfer
Mullite
Phase composition
Phase diagrams
Silicon dioxide
Solid phases
Studies
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Summary: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.
ISSN:1083-4877
1573-9139
DOI:10.1007/BF02765084