Crystal growth of TiC grains during SHS reactions
Abstract
The microstructure formation of TiC during self-propagating high-temperature synthesis (SHS) reactions is investigated thanks to the quenching method. The morphology and chemical composition of titanium carbide grains are characterized, during the growth phase, from X-ray diffraction (XRD), scanning electron microscopy (SEM) and wavelength dispersion spectroscopy (WDS) analyses. It is demonstrated that TiC x grains nucleate with a great deficit in carbon; the carbon composition evolves towards the stoichiometry during the growth phase. The TiC grain sizes are then coupled to thermal data acquired by infra red (IR) thermography. It is shown that the convolution of the temperature and of the time elapsed in the temperature range Tmax-1000 K constitute a pertinent parameter to give account of the variation of TiC grain sizes.
- Publication:
-
Journal of Crystal Growth
- Pub Date:
- June 2007
- DOI:
- 10.1016/j.jcrysgro.2007.02.018
- Bibcode:
- 2007JCrGr.304..481C
- Keywords:
-
- 81.20.Ka;
- 81.10.-h;
- 81.40.-z;
- Chemical synthesis;
- combustion synthesis;
- Methods of crystal growth;
- physics of crystal growth;
- Treatment of materials and its effects on microstructure and properties