Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/24684

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Title
Reaction kinetics in Ti3SiC2 synthesis studied by time-resolved neutron diffraction
Author/Creator
Wu, Erdong;  Riley, Daniel Phillip;  Kisi, Erich Herold;  Smith, R. I.
Description
The reactive sintering of 3Ti/SiC/C to form the ternary carbide Ti3SiC2, previously found to involve the intermediate phases TiCx and Ti5Si3Cx, was investigated by time-resolved neutron powder diffraction. The kinetics of Ti3SiC2 formation from the intermediate phases TiCx Ti5Si3Cx (x <= 1) and a small amount of free C was determined. The crystallization rate of the Ti3SiC2 phase was determined through quantitative analyses of the diffraction patterns collected at different temperatures and is initially well-described by the Mehl-Avrami-Johnson equation. The activation energy was found to be 380 +/- 10 kj/mol and the Avrami exponent 3.0 +/- 0.2. The Avrami exponent decreases to close to I when more than half of the crystallization process was completed. This indicates a change in the mechanism of Ti3SiC2 crystal growth from unrestricted two or three-dimensional growth in the a-b planes to one-dimensional growth only, due to interaction of the growing,disk-like crystals and cessation of growth in the preferred direction.
Relation
Journal of the European Ceramic Society Vol. 25, no. 15, p. 3503-3508
Date
2005
Publisher
Elsevier Science
Keyword(s)
sintering;  carbides;  kinetics;  Ti3SiC2;  neutron diffraction;  high-temperature synthesis;  powder diffraction;  phase change;  microstructure;  nucleation;  growth
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/24684
Identifier
ISSN:0955-2219
Language
eng
Reviewed
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Subject
"Journal of the European Ceramic Society"
 
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