Thermodynamic Analysis and Microstructure Study of ZrO_2-Ti Metal-Ceramic Composites

The standard Gibbs free energy of Ti_2O was predicted according to the quasi-parabola rule. The co-existing region of Ti and ZrO_2 was obtained by thermodynamic calculation to de termine the synthesis conditions of this composite. ZrO_2-Ti system composites sintered under ordinary pressure were prepared by a powder metallurgical method. The gradient distribution of composition, the interfacial microstructure between layers and the combining state of phases between Ti and ZrO_2 were investigated by means of XRD, SEM, EDS, TEM and so on. The experimental results show that the joint between Ti and ZrO_2 phases is physical in this composite. ZrO_2 mainly exists as a tetragonal phase.