EFFECT OF THE W-W CONTIGUITY ON CONDUCTIVITY OF W-Cu COMPOSITE

摘要

W-15wt.% Cu nanocomposite powder fabricated by ball-milling and subsequent hydrogen-reduction was sintered for 1 h at 1200℃ with 5 and 20℃/min. The homogeneity of the sintered microstructures was evaluated by the standard deviation of Vicker's hardness test and thermal conductivity from thermal diffusivity of laser flash method. The W—W contiguity was calculated by using Voronoi diagrams. The sintered microstructure in case of the 20 ℃/min sample was more homogeneous and had lower W-W contiguity than the 5 ℃/min sample. Thermal conductivity of the 20 ℃/min sample was about 5 % higher than the thermal conductivity of the 5 ℃/min sample. As the W-W contiguity was increased, conductivity was decreased. This indicates that the thermal conductivity is affected by the W-W contiguity resulting from the homogeneity of the sintered microstructure.