Thermal conductivity of superplastically deformed 3Y-TZP : Superplasticity and its applications

The thermal diffusivity and specific heat of superplastically deformed 3Y-TZP specimens were measured in a temperature range from 298 to 1273 K. From these data, the thermal conductivity has been evaluated and discussed. A weak temperature dependence of the thermal conductivity was observed. The thermal conductivity showed almost no dependence on the grain size and grain aspect ratio of the 3Y-TZP specimens. On the other hand, the thermal conductivity was considerably sensitive to the deformation-induced cavities. The influence of the cavities on the thermal conductivity is related with temperature. An expression was proposed for predicting the relationship between the effective thermal conductivity and deformation-induced cavities within the present experimental range.