High-Temperature Reaction Process of Si-Ti Powcer Mixtures under a Nitrogen Gas

Abstract

In this work, high-temperature reaction process with gaseous nitrogen led Si and Ti powders, Si and titanium silicide powders or titanium silicide powders to two phase ceramic composites consisting of Si₃N₄ (α-Si₃N₄ and β-Si₃N₄) and TiN. The results of X-ray diffraction analysis showed there are remarkable differences in the ratio of α-Si₃N₄/β-Si₃N₄ between the specimen used elemental powders and that used intermetalic powders. That is mainly caused by a difference in the starting temperature and reactivity of silicon nitridation. Thus, it is promising for synthesis of Si₃N₄-TiN composite powders to use intermetalic powders.