Rapid Transformation of α-Alumina Nanocomposite Powders by Microwave Assisted Combustion

Abstract:

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The microwave-assisted combustion synthesis as a route to obtain ultrafine α-alumina and magnesium aluminate composite powders starting from the ammonium aluminum carbonate hydroxide precursor was investigated. The synthetic temperature and the crystallite size of the α- alumina nanocomposite powder were significantly affected by the environmental atmosphere in the microwave assisted combustion. The α-alumina and spinel composite powder was obtained by the microwave-assisted combustion at temperature of 1000°C under H2/N2, but at 1150°C by the normal heat process under air. The rapid transformation from γ- to α-phase was achieved by microwave assisted nucleation at low temperature of 900°C under H2/N2 atmosphere. The least crystallite size of 26.2 nm was obtained under H2/N2 atmosphere at 1000°C for 10 min.

Info:

Periodical:

Solid State Phenomena (Volumes 124-126)

Edited by:

Byung Tae Ahn, Hyeongtag Jeon, Bo Young Hur, Kibae Kim and Jong Wan Park

Pages:

823-826

DOI:

10.4028/www.scientific.net/SSP.124-126.823

Citation:

Y. M. Jung and S. W. Kim, "Rapid Transformation of α-Alumina Nanocomposite Powders by Microwave Assisted Combustion", Solid State Phenomena, Vols. 124-126, pp. 823-826, 2007

Online since:

June 2007

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Price:

$35.00

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