Self-propagating high-temperature synthesis of Ti3SiC2:I, ultra-high-speed neutron diffraction study of the reaction mechanism
- Riley, Daniel P.
- Kisi, Erich H.
- Hansen, Thomas C.
- Hewat, Alan W.
DOIAbstract
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...
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