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Formation of Al2O3 during heating of an Al/TiO2 nanocomposite powder

Published online by Cambridge University Press:  03 March 2011

D.L. Zhang ,
D.Y. Ying  and
P. Munroe
D.L. Zhang*
Affiliation:
Waikato Centre for Advanced Materials, Department of Materials and Process Engineering, University of Waikato, Hamilton 2001, New Zealand
D.Y. Ying
Affiliation:
Bioengineering Technologies Team, HortResearch, Ruakura Research Centre, Hamilton 2001, New Zealand
P. Munroe
Affiliation:
Electron Microscope Unit, University of New South Wales, Sydney 2052, Australia
*
a) Address all correspondence to this author. e-mail: d.zhang@waikato.ac.nz
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Abstract

The solid-state reactions between Al and TiO2 that occur during heating an Al/TiO2 nanocomposite powder produced using high-energy mechanical milling have been studied using thermal analysis, x-ray diffractometry (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) in combination with compositional microanalysis. It has been found that Al and TiO2 react in the temperature range from 650 to 800 °C, forming Al3Ti, but XRD analysis, SEM examination, and detailed TEM characterization of the powder particles heated to 800 °C show that the expected Al2O3 does not form. However, α–Al2O3 particles form during heating from 800 to 1000 °C. The possible reasons for the time gap between formation of Al3Ti and Al2O3 are discussed.

Keywords

Chemical reactionCompositePowder processing

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Type
Articles
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Journal of Materials Research , Volume 20 , Issue 2 , February 2005 , pp. 307 - 313
Copyright
Copyright © Materials Research Society 2005

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