Nano-composite Powder of Tungsten Coated Copper Produced by Thermo-chemistry Co-reduction

Two kinds of copper oxide with different particle sizes and 1.5 μm tungsten trioxide powder were employed to prepare the high-purity CuWO4 powder. By two stage hydrogen-reduction of the CuWO4 at 360 and 750 °C respectively and continuously, nano-composite powder of tungsten coated copper was synthesized. Micro-morphology, crystallization-components and grain-size of the products were investigated by scanning electron microscope (SEM), X-ray diffract meter (XRD) and transmission electric microscope (TEM) and laser particle size analyzer (LPSA) was also applied to measure the particle-size of CuWO4. The W film thickness of nano-composite powder synthesized by smaller-sized CuWO4 is thinner than that made from bigger-sized CuWO4. The average particle size of nano-composite powder of tungsten coated copper is about 50 nm under the two-stage hydrogen reduction.