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

Abstract:

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.

• Periodical: Solid State Phenomena (Volumes 124-126)
• Pages: 823-826
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.124-126.823
• Online since: June 2007
• Authors: Young Mi Jung, Sang Woo Kim
• Keywords: Aluminum (Al), Magnesium Aluminate, Micro-Wave, Nanocomposite, Spinel, Synthesis

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