A THERMODYNAMIC ANALYSIS OF CERMET SINTERING OF TIN-NI POWDER MIXTURES

The Ti-Ni-N phase diagram has been thermodynamically assessed, and a c onsistent set of thermodynamic functions has been developed. An extend ed ternary solubility of nitrogen in Ti2Ni and the ternary interaction in liquid phase have been modeled. The solid ternary solution phases were extrapolated from the thermodynamic descriptions of the binary bo undary systems, The experimental phase equilibria at 1100 and 900 degr ees C have been well reproduced. The thermodynamic description of the Ti-Ni-N system has been applied to study the conditions for the format ion of nitride inclusion in nickel alloys containing titanium, the nit ridation of Ni-Ti alloys, and the denitrification, phase formation, an d vaporization during the sintering of the TiN-Ni mixed powder compact s.