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Structural transformations of alumina by high energy ball milling

Published online by Cambridge University Press:  03 March 2011

P.A. ZielińAski ,
R. Schulz ,
S. Kaliaguine  and
A. Van Neste
P.A. ZielińAski
Affiliation:
Département de Génie Chimique, Université Laval, Québec G1K 7P4, Canada
R. Schulz
Affiliation:
Technologie des Matériaux, Institut de Recherche d'Hydro-Québec, Varennes, Québec J3X 1S1, Canada
S. Kaliaguine
Affiliation:
Département de Génie Chimique, Université Laval, Québec G1K 7P4, Canada
A. Van Neste
Affiliation:
Département de Mines et Métallurgie, Université Laval, Québec G1K 7P4, Canada
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Abstract

Room temperature, high energy ball milling was applied to various transition aluminas (γ, K, χ), producing thermodynamically stable α-alumina–a phenomenon that could otherwise be achieved only by high temperature (1100–1200 °C) heat treatment. The transformation proceeds in two steps. The first one consists of rapid microstructural rearrangements with continuously increasing α-transformation rate. In the second step (1–2 h from the start), only relatively small changes in morphology are observed with a constant α-transformation rate. The rate is influenced only by the milling intensity. The presence or the absence of oxygen in the milling atmosphere has a large influence on the final surface area of α-alumina.

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Type
Articles
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Journal of Materials Research , Volume 8 , Issue 11 , November 1993 , pp. 2985 - 2992
Copyright
Copyright © Materials Research Society 1993

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References

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