Study of TiC/Ni3Al composites by laser ignited self-propagating high-temperature synthesis (LISHS)

Abstract

TiC/Ni 3 Al composites have been obtained in situ by laser ignited self-propagating high-temperature synthesis (LISHS) of an intimate mixture of compacted powders of elemental C, Ti, Ni and Al. Ignition temperature ( T ig ) and combustion temperature ( T c ) are investigated; the effects of Ni 3 Al content on density, phase composition, microstructure of the reaction products and particle size of the synthesized TiC were studied. The results show the density of the products varies with Ni 3 Al content, and a maximum value of density appears at 50 wt.% Ni 3 Al; TiC and Ni 3 Al are the two stable phases after SHS, TiC particle size decreases with the increasing of Ni 3 Al content, however, the decreasing of grain size is unobvious when Ni 3 Al content is over 60 wt.%.