Effect of Particle Size and Content of Raw Materials on Self-Propagating High-Temperature Synthesis of Ti-C-Fe System

The effects of Fe content, carbon sources and the particle size of Ti and C on the SHSprocesses of Ti-C-Fe and structure charactristics of synthesized powders were studied. It is shownthat combustion temperature becomes lower and particle sizes of synthesized product becomesmaller with the increasing of Fe content and the velocity of combustion wave is highest at 10wt%of Fe content. This is due to the effect of Fe liquid. The composition of TiC synthesized withgraphite is more close to the stoichiometric TiC, the size of TiC particles is larger and combustiontemperature and velocity of combustion wave are higher than with carbon black. The structuredifference between the two kinds of carbon is responsible for the effect of carbon. Smaller Tiand C particle sizes do good to combustion synthesis of the system. With the increasing of Fecontent the combustion model becomes pulsating and spin combustion from steady combustion.The combustion reaction for the system can'nt sustain if Fe content is higher than 60wt%.