Ti_2AlC ternary carbide synthesized by thermal explosion

摘要

Ti_2AlC ternary carbide was fabricated from 2Ti-Al-C powder blend employing thermal explosion (TE) mode of self-propagating high-temperature synthesis (SHS). The formation of Ti_2AlC was found to occur during cooling from the high combustion temperature (>2000℃) by a peritectic reaction between the earlier formed liquid Ti aluminides and a solid Ti carbide, TiC_(1-x). The application of a moderate 30-MPa pressure during TE at 800℃ yielded a near fully dense material containing, in addition to the Ti_2AlC ternary phase, an appreciable amount of TiC_(1-x).