Combustion Synthesis of Ti_3SiC_2/TiC Composites from Elemental Powders under High-Gravity Conditions

摘要

Combustion synthesis of Ti_3SiC_2/TiC composites from 3Ti/xSi/ 2C (x = 1, 1.1, 1.2) powders was conducted under high-gravity conditions with gravity up to 895 G. The results showed that the phase composition of the products strongly depended on the gravity level. We find that high-gravity synthesis favors the growth of TiC phase over Ti_3SiC_2 phase, as a consequence of the reduced existence time of the Ti-Si liquid phase. This discovery suggests that gravity provides a new leverage for controlling product phase composition in combustion synthesis. It was also found that the densification process during combustion synthesis could be enhanced under a high-gravity condition.