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Dynamic neutron diffraction study of thermal stability and self-recovery in aluminium titanate

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Authors
Low, It-Meng
Oo, Zeya
Date
2010
Type
Conference Paper

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Citation
Low, I.M. and Oo, Z. 2010. Dynamic neutron diffraction study of thermal stability and self-recovery in aluminium titanate, in Sanjay Mathur and Tatsuki Ohji (ed), Proceedings of the 34th International Conference on Advanced Ceramics and Composites, Jan 24 2010, pp. 139-149. Daytona Beach, Florida: American Ceramic Society.
Source Title
Proceedings of the 34th International Conference on Advanced Ceramics and Composites
Source Conference
Proceedings of the 34th International Conference on Advanced Ceramics and Composites
School
Department of Imaging and Applied Physics
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Reprinted with permission of The American Ceramic Society, http://www.ceramics.org/, All rights reserved.

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Abstract

Aluminium titanate (Al2TiO5) is an excellent refractory and thermal shock resistant material dueto its relatively low thermal expansion coefficient and high melting point. However, Al2TiO5 unstableand undergoes a eutectoid-like decomposition to a-Al2O3 and TiO2 (rutile) at the temperature range of900-1280C. In this paper, we describe the use of high-temperature neutron diffraction to study (a) thephenomenon of self-recovery in decomposed Al2TiO5, and (b) the role of grain size on the rate ofisothermal decomposition at 1100C. It is shown that the process of decomposition in Al2TiO5 isreversible whereby self-recovery occurs readily when decomposed Al2TiO5 is re-heated above 1300C,and the rate of phase decomposition increases as the grain size decreases.