Alumina-chromia refractories have been found to resist corrosion in oxide and other melts, finding application
in gasifiers and steel production. Refractories still experience some attack in these and other environments,
and thus there is a substantial need to understand their behavior.
The GASIF data file for use with coal gasifiers problems contains the system Na-Ca-Al-Cr-Si-B-O-C-H.
The chromia-alumina system is included so that refractory behavior can be considered. The global liquid
phase is modeled using the modified associate species approach. End-member solid solutions were not modeled,
and thus end-members are treated as stoichiometric compounds with no solubility for other components. There
is a limited model for mullite restricted to Na2O-AlO2-SiO2.
Na2O-CaO-Al2O3-Cr2O3-B2O3-SiO2 (GASIF)
References:
1. T. M. Besmann, N. S. Kulkarni, and K. E. Spear, "Thermochemical Analysis and Modeling of the
Al2O3-Cr2O3, Cr2O3-SiO2,
and Al2O3-Cr2O3-SiO2 Systems Relevant to Refractories,"
submitted to the Journal of the American Ceramic Society.
2. T. M. Besmann, N. S. Kulkarni, and K. E. Spear, "Thermochemical And Phase Equilibria Property Prediction
For Oxide Glass Systems Based On The Modified Associate Species Approach," pp. 557-566, in High Temperature
Corrosion and Materials Technology IV, The Electrochemical Society, Pennington, NJ 2004.
3. K. E. Spear, T. M. Besmann, M.D. Allendorf; "Modeling the Equilibrium Behavior of Chemically Complex
Oxide Glass Solutions," High Temperature Corrosion and Materials Chemistry V, E. Opila et al., Eds.
The Electrochemical Society Proceedings Series.
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