Experimental investigation of the equilibrium composition of titanium carbonitride and analysis using thermodynamic modelling

Abstract A new experimental investigation of the composition of titanium carbonitride (TiCxNy(cF8)) is presented. The C and N contents in equilibrium with graphite and N2 gas of pressures of 1 bar and 100 bar have been determined at 1430°C and 1850°C. Special effort has been made to verify that equilibrium is reached. Using the new experiments a revised thermodynamic description of the Ti–C–N system is presented, including also an assessment of the molar volumes in this system. Calculated phase equilibria are presented and compared with experimental information, and the agreement is discussed. Further, the differences in measured results are discussed.