Comparison of thermal stability in MAX 211 and 312 phases

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Insitute of Physics
The susceptibility of four MAX phases (Ti 2 AlC, Cr 2 AlC, Ti 3 AlC 2 , and Ti 3 SiC 2 ) 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 Ti 3 SiC 2 , Ti 3 AlC 2 , and Ti 2 AlC were determined to be 179.3, -71.9, and 85.7 kJ mol −1 , respectively. The spontaneous release of Ti 2 AlC and TiC from de-intercalation during decomposition of Ti 3 AlC 2 resulted in a negative activation energy.© 2010, Insitute of Physics
Temperature range 0065-0273 K, Neutron diffraction, Pressure range micro pa, Surface coating, Decomposition, Magnetic susceptibility
Pang, W.K., Low I.M., O'Connor, B.H., Studer, A.J., Peterson, V.K., Sun, Z.M., Palmquist, J.P. (2010). Comparison of thermal stability in MAX 211 and 312 phases. Journal of Physics: Conference Series, International Conference on Neutron Scattering 2009, 3th–7th May 2009. Knoxville, Tennessee, USA, 251(1), Art. No. 012025. doi:10.1088/1742-6596/251/1/012025