Preparation and thermal properties of zirconium tungstate/copper composites

摘要

ZrW_2O_8/Cu composites were prepared by the powder metallurgy method. Electroless plating was used to deposit copper on ZrW_7O_8 powder before sintering. The thermal expansion and thermal conductivity of composites were measured in the temperature range from 25 ℃ to 200 ℃ and compared with those predicted from various theoretical models. The results show that the coefficient of thermal expansion of ZrW_2O_8/ Cu composites with a different volume fraction of ZrW_2O_8 is greater than the theoretically calculated value. The thermal conductivities of ZrW_2O_8/ Cu composites in- crease with a higher copper content and decrease upon elevated temperature. The thermal conductivity of composites with a different volume fraction of ZrW_2O_8 is lower than the theoretically calculated value.