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The influence of water vapor on thermal transformation of boehmite

Published online by Cambridge University Press:  31 January 2011

Zdenek Hrabe ,
Sridhar Komarneni ,
Ladislav Pach  and
Rustum Roy
Zdenek Hrabe*
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
Sridhar Komarneni*
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
Ladislav Pach*
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
Rustum Roy
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
*
a)Current address: Department of Silicate Chemistry, Slovak Technical University, CS-812 37 Bratislava, Czechoslovakia.
b)Also with the Department of Agronomy.
a)Current address: Department of Silicate Chemistry, Slovak Technical University, CS-812 37 Bratislava, Czechoslovakia.
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Abstract

Boehmite compacts and boehmite gels (seeded and unseeded) were annealed at various temperatures in nitrogen and 1 atm water vapor to determine the influence of water vapor on boehmite transformation to new phases, changes in porosity, and morphology. Water vapor was found to accelerate the phase transformations markedly compared to dry N2 treatment. The catalyzing effect of water vapor may be due to its interactions on grain surfaces and generation of fast diffusion paths, resulting in nucleation and growth of new phases. This result shows that control of the furnace atmosphere is a useful variable in thermally activated processes.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 2 , February 1992 , pp. 444 - 449
Copyright
Copyright © Materials Research Society 1992

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