Abstract:The composite ceramic powders of Ti-Si-B4 C-C system were prepared by combustion synthesis
method based on thermodynamic analysis. The phase and microstructure of the products were respectively characterized
by XRD and SEM. The mechanism of combustion reaction was discussed.The results show that the composite powders
are composed of Ti3SiC2ꎬ TiB2 and TiCꎬ in which Ti3SiC2 is matrix phaseꎬ TiB2 and TiC are reinforcing phases. The
mass fractions of Ti3SiC2ꎬ TiB2 and TiC are 42.7% to 45.7%ꎬ 26.3% to 29.5% and 27.8% to 28.0%. TiB2 angular
particles and TiC irregular particles are dispersively distributed in layered structure Ti3SiC2. The combustion reaction
of Ti and Cꎬ the formation of Ti-Si meltꎬ the reduction of B and the synthesis of Ti3SiC2ꎬ the nucleation and growth
of TiB2 occur in the process of Ti-Si-B4C-C system combustion reaction.