Abstract
Ternary compound Ti 3SiC 2 was rapidly synthesized by pulse discharge sintering the powder mixture of 1TiH 2/1Si/1.8TiC without preliminary dehydrogenation. Almost single-phase dense Ti 3SiC 2 was synthesized at 1400 °C for 20 min. The grain size of synthesized Ti 3SiC 2 strongly depends on sintering temperature. The synthesis mechanism of Ti 3SiC 2 was revealed to be completed via the reactions among the intermediate phases of Ti 5Si 3, TiSi 2 and the other reactants in the starting powder. The Ti–Si liquid reaction occurring above the Ti–Ti 5Si 3 eutectic temperature at 1330 °C was found to assist the synthesis reaction and densification of Ti 3SiC 2. The dehydrogenation of TiH 2 was accelerated by the synthesis reactions.
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