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Phase Transformation and Densification Behavior of Microwave Sintered γ-A12O3

Published online by Cambridge University Press:  15 February 2011

John Freim ,
Joanna McKittrick ,
Joel Katz  and
Kurt Sickafus
John Freim
Affiliation:
University of California, San Diego, La Jolla, CA 92093–0411
Joanna McKittrick
Affiliation:
University of California, San Diego, La Jolla, CA 92093–0411
Joel Katz
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
Kurt Sickafus
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
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Abstract

The phase transformation and densification behavior of gas condensation synthesized γA12O3 sintered with microwave radiation has been studied. Nucleation and growth phase transformations, which produce α-A12O3 occurred as the material was heated through the temperature range of 800–1300°C. These phase transformations resulted in anomalous grain growth with a distinct change in particle morphology, crystallite size and surface area. A12O3 derived from a chemically synthesized boehmite precursor has been shown to exhibit the same nucleation and growth phase transformation behavior when conventionally heated. It is concluded that nanocrystalline γ or β alumina will not be a viable starting material for the production of dense bodies with grain sizes of less than 100 nm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 347: Symposium O – Microwave Processing of Materials IV , 1994 , 525
Copyright
Copyright © Materials Research Society 1994

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References

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