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The Effect of Heat Generation on the Development of Vermicular α-Al 2O3 in Alumina Films

Published online by Cambridge University Press:  10 February 2011

R.B. Bagwell  and
G.L. Messing
R.B. Bagwell
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University147 Research Building West, University Park, PA 16802
G.L. Messing
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University147 Research Building West, University Park, PA 16802
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Abstract

The transformation of transition aluminas (i.e. θ-A12O3) to α-A12O3 results in an interconnected, porous microstructure that is commonly described as ‘wormy’ or‘vermicular’. The effect of heat generated during the exothermic transformation at the θ-Al2O3/α-Al2O3 interface on the development of the vermicular α-A12O3 morphology was analyzed in boehmite-derived thin films. The vermicular structure may arise in an analogous manner to the thermal dendrites formed in metals during solidification. However, the analysis shows that heat generation and transfer at the interface does not play a significant role in the development of α-A12O3 dendrites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 432: Symposium S – Aqueous Chemistry and Geochemistry of Oxides , 1996 , 133
Copyright
Copyright © Materials Research Society 1997

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