Temperature dependence of the thermal conductivity of AlN(Y₂O₃) ceramics by hot-press sintering

AlN ceramics were prepared by hot-press sintering with Y₂O₃ as additive. The temperature dependence of the thermal conductivity of AlN ceramics was measured using the flash-diffusivity technique. Thermal conductivity data from room temperature to 200°C was found to decrease as the temperature increasing. Stomata inhibits the rate of thermal conductivity as temperature changing. The lower porosity(the higher densification), the thermal conductivity was more sensitive to the temperature; yttrium aluminates as grain boundary phase promotes the rate of thermal conductivity as temperature changing. The more content of yttrium aluminates, the thermal conductivity was more sensitive to the temperature.