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Comparison of thermal stability in MAX211 and 312 phases

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Open access
Authors
Pang, Wei Kong
Low, It-Meng
O'Connor, Brian
Studer, A.
Peterson, V.
Sun, Z.
Palmquist, J-P.
Date
2010
Type
Conference Paper

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Citation
Pang, W.K. and Low, I.M. and O'Connor, B.H. and Studer, A.J. and Peterson, V.K. and Sun, Z.M. and Palmquist, J-P. 2010. Comparison of thermal stability in MAX211 and 312 phases, International Conference on Neutron Scattering 2009, May 3 2009. Knoxville, Tennessee, USA: Institute of Physics (IOP).
Source Title
Journal of Physics: Conference Series Volume 251
Source Conference
International Conference on Neutron Scattering 2009
DOI
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School
Department of Imaging and Applied Physics
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© 2010 IOP Institute of Physics

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Abstract

The susceptibility of four MAX phases (Ti2AlC, Cr2AlC, Ti3AlC2, and Ti3SiC2) to high-temperature thermal dissociation in vacuum has been investigated using in-situ neutron diffraction. In high vacuum, these phases decomposed above 1400°C through the sublimation of M and A elements, forming a surface coating of MC. The apparent activation energies for the decomposition of sintered Ti3SiC2, Ti3AlC2, and Ti2AlC were determined to be 179.3, -71.9, and 85.7 kJ mol−1, respectively. The spontaneous release of Ti2AlC and TiC from de-intercalation during decomposition of Ti3AlC2 resulted in a negative activation energy.