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Title
Self-propagating high-temperature synthesis of Ti3SiC2:I, ultra-high-speed neutron diffraction study of the reaction mechanism
Author/Creator
Riley, Daniel P.;  Kisi, Erich H.;  Hansen, Thomas C.;  Hewat, Alan W.
Description
In situ neutron diffraction at 0.9 s time resolution was used to reveal the reaction mechanism during the self-propagating high-temperature synthesis (SHS) of Ti3SiC2 from furnace-ignited stoichiometric 3Ti + SiC + C mixtures. The diffraction patterns indicate that the SHS proceeded in five stages: (i) preheating of the reactants, (ii) the (alhpa)-(beta) phase transformation in Ti, (iii) preignition reactions, (iv) the formation of a single solid intermediate phase in <0.9 s, and (v) the rapid nucleation and growth of the product phase Ti3SiC2. No amorphous contribution to the diffraction patterns from a liquid phase was detected and, as such, it is unlikely that a liquid phase plays a major role in this SHS reaction. The intermediate phase is believed to be a solid solution of Si in TiC such that the overall stoichiometry is ~3Ti:1Si:2C. Lattice parameters and known thermal expansion data were used to estimate the ignition temperature at 923 ± 10°C (supported by the (alpha)-(beta) phase transformation in Ti) and the combustion temperature at 2320 ± 50°C.
Relation
The Journal of American Ceramic Society Vol. 85, Issue 10, p. 2417-2424
Publisher Link
http://dx.doi.org/10.1111/j.1151-2916.2002.tb00474.x
Date
2002
Publisher
American Ceramic Society
Keyword(s)
high temperature;  synthesis;  titanium
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/27075
Identifier
ISSN:0002-7820
Reviewed
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Subject
"The Journal of American Ceramic Society"
 
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