Effect of Al_2O_3 content on the synthesized products by the laser ignited self-propagating high-temperature synthesis reaction of Al_2O_3-Ti-C system

摘要

The effect of Al_2O_3 content on ignition temperature and combustion temperature, the phase composition, the density of the products and the grain size of TiC was investigated by self-propagating high-temperature synthesis reaction of Al_2O_3-Ti-C system. The results show ignition temperature increases and combustion temperature decreases with the increasing of Al_2O_3 content; the density of the products varies with Al_2O_3 content, TiC and Al_2O_3 are the two stable phases after SHS, TiC particle size decreases with the increasing of Al_2O_3 content, furthermore, the fracture type of the sintered specimens is a nearly completely intergranu-lar mode.