Thermodynamic aspects of synthesis of refractories from talc-kaolin-alumina compositions

Possible solid-phase chemical reactions with talc, kaolinite, and alumina taken as the initial raw components are considered from the standpoint of thermodynamics. Stoichiometric dependences that make it possible to control the phase composition of the synthesized materials by varying the proportion...

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Bibliographic Details
Published in:Refractories and industrial ceramics 1998-04, Vol.39 (3-4), p.135-138
Main Authors: LOGVINKOV, S. M, SEMCHENKO, G. D, KOBYZEVA, D. A
Format: Article
Language:English
Subjects:
Aluminous refractories
Aluminum oxide
Applied sciences
Building materials. Ceramics. Glasses
Ceramics
Chemical composition
Chemical industry and chemicals
Chemical reactions
Cordierite
Corundum
Exact sciences and technology
Kaolin
Kaolinite
Mullite
Phase composition
Phase diagrams
Refractories
Refractory products
Solid phases
Special refractories
Stoichiometry
Talc
Talcs
Thermodynamics
Triangles
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Description
Summary:Possible solid-phase chemical reactions with talc, kaolinite, and alumina taken as the initial raw components are considered from the standpoint of thermodynamics. Stoichiometric dependences that make it possible to control the phase composition of the synthesized materials by varying the proportion of the ingredients are analyzed. The reaction resulting in a three-phase combination of corundum—mullite—cordierite with stoichiometric coefficients of 45, 74, and 6, respectively, is shown to have the maximum thermodynamic probability. It is assumed that the point that corresponds to this proportion of the phases in the M—A—S phase diagram is a singular point and can be close to the assumed point of the triple eutectic in the A—MA—A3S2 elementary triangle.
ISSN:1083-4877
1573-9139
DOI:10.1007/BF02768040