Study of high-temperature thermal stability of MAX phases in vacuum
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Date
2010-01-28
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Publisher
American Ceramic Society
Abstract
The susceptibility of two MAX phases (Ti2AlN and Ti 4AlN3) 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 1400°C 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 Ti 2AlN 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.
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Keywords
Ceramics, Coatings, Dissociation, Pressure range micro pa, Phase stability, Titanium nitrides
Citation
Low, I. M., Pang, W. K., Kennedy, S. J., & Smith, R. I. (2010). Study of high-temperature thermal stability of MAX phases in vacuum. Paper presented to the 34th International Conference and Exposition on Advanced Ceramics and Composites (ICACC’10), 24th – 29th January 2010. Daytona Beach, Florida, United States of America: Hilton Daytona Beach Resort & Ocean Center. In W. M. Kriven, & Y. Zhou, et. al. (Eds.), Strategic Materials and Computational Design: Ceramic Engineering and Science Proceedings, 31(10), pp. 171-180. Westerville, Ohio, United States of America: American Ceramic Society. doi:10.1002/9780470944103.ch17