Experimental Investigation and Thermodynamic Calculation of the Titanium–Silicon–Carbon System

The 1100°C isothermal section and the isopleths at 5, 10, and 15 at.% C in the Ti–Si–C system were determined by DTA and XRD methods. Five invariant reactions (L (liquid) = Si + SiC + TiSi 2 at 1330°C, L = TiSi + TiSi 2 + Ti 5 Si 3 C x at 1485°C, L + Ti 5 Si 3 C x = Ti 3 SiC 2 + TiSi 2 at 1485°C, L + Ti 3 SiC 2 = TiSi 2 + SiC at 1473°C, and L + TiC = bcc‐(Ti) + Ti 5 Si 3 C x at 1341°C) were observed. The transition temperature for L + TiC = Ti 3 SiC 2 + SiC was measured by the Pirani technique. Optimized thermodynamic parameters for the Ti–Si–C system were then obtained by means of the CALPHAD (calculation of phase diagrams) method applied to the present experimental results and reliable literature data. The calculations satisfactorily account for most of the experimental data.