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Title: Comparison of thermal stability in MAX 211 and 312 phases
Authors: Pang, WK
Low, IM
O'Connor, BH
Studer, AJ
Peterson, VK
Sun, ZM
Palmquist, JP
Keywords: Temperature range 0065-0273 K
Neutron diffraction
Pressure range micro pa
Surface coating
Magnetic susceptibility
Issue Date: 3-May-2010
Publisher: Insitute of Physics
Citation: 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
Abstract: 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
Gov't Doc #: 3463
ISSN: 1742-6596
Appears in Collections:Journal Articles

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