THERMAL-EXPANSION BEHAVIOR OF ZRO2-Y2O3-NI CERMETS

Thermal expansion was measured in the temperature range from room temp erature to 950 degrees C for various compositions of the ZrO2-Ni cerme ts containing 8 wt% Y2O3. The data can be described using the first an d second coefficients of thermal expansion. The coefficient of linear thermal expansion in this specific temperature range increases linearl y with increasing Ni content, and that of ZrO2 can be obtained from th e extrapolated values. Finally, the dependence of the average coeffici ent of linear thermal expansion on composition of these cermets is dis cussed.