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Rapid Consolidation of Nanophase Al2O3 and an Al2O3/Al2TiO5 Composite

Published online by Cambridge University Press:  10 February 2011

David A. West ,
Rajiv S. Mishra  and
Amiya K. Mukherjee
David A. West
Affiliation:
Department of Chemical Engineering and Materials Science, The University of California, Davis Davis, CA 95616
Rajiv S. Mishra
Affiliation:
Department of Chemical Engineering and Materials Science, The University of California, Davis Davis, CA 95616
Amiya K. Mukherjee
Affiliation:
Department of Chemical Engineering and Materials Science, The University of California, Davis Davis, CA 95616
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Abstract

A rapid consolidation technique has been utilized in producing single phase AI2O3 in less than 10 minutes at 1400°C resulting in a grain size less than 500 nm. TiO2 has been added in hopes of obtaining Al2O3/Al2TiO5 nanocomposites in sintering times less than 30 minutes. The sintering process involves resistance heating of a graphite die containing the powder at heating rates of about 10 °C/s. The resistance heating step is preceded by a preparatory step consisting of DC voltage pulses applied across a prepressed powder compact. The retention of the nanostructure is attributed to the rapid heating rate although the possible effect of the DC pulses are also discussed. An Al2O3/Al2TiO5 composite has been produced during a short anneal immediately following sintering of an Al2O3/TiO2 nanocomposite. Substantial grain growth has been observed to occur during the transformation taking the composite to the microcrystalline regime.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 457: Symposium V – Nanophase and Nanocomposite Materials II , 1996 , 347
Copyright
Copyright © Materials Research Society 1997

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References

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