The TiC/ Ti5Si3 composites were synthesized by high energy milling and hot pressing with Ti, Si and
C powders as raw materials. The effect of processing conditions,especially hot pressing temperature,on the phase com
position and microstructure of the synthesized product was studied. Meanwhile,the thermodynamic was examined by
DSC,XRD and SEM. The results show that high purity TiC/ Ti5Si3 were successfully obtained by high energy milling for
12 h and hot pressing at 1 400 for 6 h. The synthesizing process was as follows:at first,Ti+C TiC, △G = -
167.72 kJ/ mol,then,5TiC+8Si →Ti5Si3 +5SiC, △G =-62.12 kJ/ mol,finally,3SiC+8Ti →Ti5Si3 +3TiC, △G =-
697.8 kJ/ mol. Microstructure shows that the synthesizing process of TiC/ Ti5Si3 composites go with the Si melted,the
materials are combined in the form of TiC-Si-Ti5Si3,and Si is binder.