Journal
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
Volume 55, Issue -, Pages 32-40Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.calphad.2016.06.007
Keywords
Gaseous metal hydroxides; Reaction thermodynamics; Oxides; Steam
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The thermodynamics and kinetics of gaseous metal hydroxide formation from simple oxides important for power and propulsion applications are reviewed. The transpiration technique for determining thermodynamics of gaseous metal hydroxide is highlighted. The status of thermodynamic data for CrO2(OH)(2)(g), Si(OH)(4)(g), and Al(OH)(3)(g) in available databases is described. A thermodynamic argument is presented for the trend that gaseous metal hydroxides with more -OH groups will have a greater pressure dependence and a lower temperature dependence of reaction from their condensed phase oxide than those gaseous metal hydroxides with few -OH groups. Finally, the need for thermodynamic data for Ti-, Mn-, Y-, and Ta-gaseous metal hydroxides is summarized. (C) 2016 Elsevier Ltd. All rights reserved.
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