Abstract
Yttria stabilized zirconia (YSZ) has been studied as a candidate reference material for thermophysical properties. In this study, the high-temperature stability of thermal diffusivity has been evaluated using Referceram ZR1 which was originally developed as a reference material for mechanical testing of fine ceramics. Thermal diffusivity of specimens before and after heat-treatment at various temperatures between 200 and 1500°C in air were measured by laser flash method. The heat-treatment at 900°C effected little change in thermal diffusivity. However, after heat-treatment at 1000°C or above, thermal diffusivity values were effected by phase separation, phase transportation, crack occurred in grain boundary, and so on. Therefore ZR1 should be used as a thermophysical reference material at temperatures below 900°C.
