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A Comparative Study of Decomposition Kinetics in MAX Phases at Elevated Temperature

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Authors
Low, It Meng
Pang, Wei
Date
2012
Type
Conference Paper

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Low, I.M. and Pang, W.K. 2012. A Comparative Study of Decomposition Kinetics in MAX Phases at Elevated Temperature, in D. Zhu, H. Lin, Y. Zhou and T. Huang (ed), 36th International Conference on Advanced Ceramics and Composites, Jan 22-27 2012, pp. 179-185. Daytona Beach, Florida: Wiley.
Source Title
Advanced Ceramic Coatings and Materials for Extreme Environments II: Ceramic Engineering and Science Proceedings, Volume 33, Issue 3
Source Conference
36th International Conference on Advanced Ceramics and Composites
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Abstract

The role of pore microstructures on the susceptibility of MAX phases (Ti3SiC2, Ti3AlC2, Ti2AlC, Ti2AlN2, Ti4AlN3) to thermal dissociation at 1300-1550 °C in high vacuum has been studied using in-situ neutron diffraction. Above 1400 °C, MAX phases decomposed to binary carbide (e.g. TiCx) or binary nitride (e.g. TiNx), primarily through the sublimation of Aelements such as Al or Si, forming in a porous surface layer of MXx. Positive activation energies were determined for decomposed MAX phases with coarse pores but a negative activation energy when the pore size was less than 1.0 µm. The role of pore microstructures on the decomposition kinetics is discussed.