Temperature dependence of thermal conductivity in W and W-Re alloys from 300 to 1000 K

The thermal conductivities of W and W-Re alloys with Re contents of up to 25% were obtained from their thermal diffusivity data. The W and W-Re alloys were fabricated by powder metallurgy process. The samples with 8-mm diameter and 1-mm thickness were prepared by wire cutting tool. The thermal diffusivities of W and W-Re alloys were measured from room temperature to 1000 K. The results show that the thermal conductivity of the W decreases while those of W-Re increase when temperature increases. Thermal conductivity due to electron estimated from Wiedeman-Franz-Lorenz law in W decreases with temperature while those in W-Re alloy increases. The contribution of phonon on the thermal conductivity of W with high percent Re proved to be less than the contribution of electron at high temperatures.