Formation Mechanism of Titanium Silicon Carbide: The Effect of Different Composition of Starting Materials

Titanium silicon carbide (Ti3SiC2) is a kind of ceramic that has physical property value similar with metal. Ti3SiC2 has been synthesized through various methods based on solid state reaction. Although Ti3SiC2 has been synthesized through various methods by using various starting materials consisting titanium (Ti), silicon (Si), and carbon (C) the mechanism of Ti3SiC2 formation through sintering has not fully understood. The aim of this research is to reveal the mechanism happening during sintering. Two composition of starting material was used, 2Ti/2Si/3TiC and 5Ti/2Si/3C. The analysis through XRD and SEM-EDS shows that the formation of intermediate phases, TiC and Ti5Si3, takes place prior to the formation of Ti3SiC2. In other words, Ti3SiC2 can only be formed through solid state reaction between TiC and Ti5Si3. Since TiC has already available in the system 2Ti/2Si/3TiC, the phase purity of Ti3SiC2 in 2Ti/2Si/3TiC is always higher than that of 5Ti/2Si/3C.

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