Azide SHS of highly dispersed powder of titanium carbonitride with intermediate partial nitriding or partial carburizing titanium powder

摘要

It is noted that the powder of titanium carbonitride(TiC_(0.5)N_(0.5))is the basis of the TiC_(1-x)Nx/Ni-Mo system cermets, which are considered as the most promising tool materials for the replacement of classical hard alloys based on tungsten carbide of the WC-Co system.The properties of these cermets are the higher the finer is the titanium carbonitride powder from which they are sintered.First, a simple energy-saving process of self-propagating high-temperature synthesis(SHS)was applied for the intermediate partial nitriding of the initial metal powder of titanium to the composition of TiN0 2 or partial carburizing to TiCo 3 composition in order to ensure fire safety and efficiency of the grinding process in the planetary ball mill to obtain superfine powders of partially nitrided or carburized titanium with ultrafine structure.Further, these powders were used in the azide SHS process for complete nitriding and carburizing to produce titanium carbonitride powder which was composed of superfine agglomerates of ultrafine and nano-particles of TiC_(0.5)N_(0.5).