Synthesis of complex carbonitrides Ti1−x WxC1−y Ny

Abstract

We have studied the effect of process factors (temperature, nitrogen pressure, composition) on synthesis of carbonitrides Ti1−xWxC1−yNy from the starting components (WC, TiC, TiN) with particle size 10–12 μm. Under realistic conditions, we have determined the range of existence for homogeneous cubic carbonitrides. As the tungsten carbide content increases, the temperature needed for synthesis of homogeneous carbonitrides increases. Synthesis of complex carbonitrides occurs in two steps: via formation of titanium carbonitride followed by dissolution of WC in the latter, and by formation of the complex titanium-tungsten carbonitride. We have established that the major reason for the appearance of the W2C phase is thermal dissociation of titanium nitride.