High-temperature thermal stability of Ti2AlN and Ti4AlN3: A comparative diffraction study
Access Status
Authors
Date
2011Type
Metadata
Show full item recordCitation
Source Title
ISSN
School
Collection
Abstract
The susceptibility of Ti2AlN and Ti4AlN3 to high-temperature thermal dissociation in a dynamic environment of high-vacuum has been investigated using in situ neutron diffraction. Under high vacuum, these ternary nitrides decomposed above 1400 °C through the sublimation of Al, and possibly Ti, to form a surface coating of TiNx (0.5=x=0.75). The kinetics of isothermal phase decomposition were modelled using the Avrami equation and the Avrami exponents (n) of isothermal decomposition of Ti2AlN and Ti4AlN3 were determined to be 0.62 and 0.18, respectively. The characteristics of thermal stability and phase transitions in Ti2AlN and Ti4AlN3 are compared in terms of the rate of decomposition, phase relations and microstructures.
Related items
Showing items related by title, author, creator and subject.
-
Chamberlain, Anthony C. (1996)The effect of stoichiometry on the pyrolytic decomposition, oxidation and ignition behaviour of synthetic violarite and pentlandite has been established. These minerals, of general formula (Fe,Ni)(subscript)3S(subscript)4 ...
-
Low, It-Meng; Oo, Zeya (2010)Aluminium titanate (Al2TiO5) is an excellent refractory and thermal shock resistant material due to 25 its relatively low thermal expansion coefficient and high melting point. However, Al2TiO5 is only 25 thermodynamically ...
-
Fisher, Nicholas G. (2000)Activated carbon is widely used in the gold processing industry as an adsorbent for the gold cyanide complex, [Au(CN)(subscript)2]. However, many other processing reagents are also adsorbed (termed fouling), which compete ...