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Study of high-temperature thermal stability of max phases in vacuum

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Open access
Authors
Low, It-Meng
Pang, W.
Kennedy, S.
Smith, R.
Date
2010
Type
Conference Paper

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Citation
Low, I.M. and Pang, W.K. and Kennedy, S.J. and Smith, R.I. 2010. Study of high-temperature thermal stability of max phases in vacuum, in Sanjay Mathur and Tatsuki Ohji (ed), Proceedings of the 34th International Conference on Advanced Ceramics and Composites, Jan 24 2010, pp. 171-180. 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
Remarks

Reprinted with permission of The American Ceramic Society, http://www.ceramics.org/, All rights reserved.

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Abstract

The susceptibility of two MAX phases (Ti2AlN and Ti4AlN3) to high-temperature thermal dissociation in a dynamic environment of high-vacuum has been investigated using in-situ neutron diffraction. In high vacuum, these phases decomposed above 1400C through the sublimation of Ti and Al elements, forming a surface coating of TiN. The kinetics of isothermal phase decomposition was modelled using the Avrami equation and the Avrami exponent (n) of isothermal decomposition of Ti2AlN and Ti4AlN3 was determined to be 0.62 and 0.18 respectively. The characteristics of thermal stability and phase transitions in Ti2AlN and Ti4AlN3 are compared and discussed.