Abstract：A special W coated Cu nano-composite powder was successfully synthesized via hydrothermal reaction and calcining-continuous reduction process， and the phase， morphology and microstructure of the powder obtained at different preparation stages were analyzed using XRD， SEM and TEM， respectively. Results show that the near-spherical CuWO4·2H2O and Cu2WO4(OH)2 complexes are produced by co-precipitation between Na2WO4·2H2O and Cu(NO3)2·3H2O during hydrothermal reaction， and this complex powder has good dispersibility， a narrow size distribution of 10-15 nm without hard aggregate. After calcination， the precipitations are converted into a mixed oxide powders consisted of[CuWO4-x，]CuO and WO3 through dehydration and decomposition. After hydrogen reduction， the oxide powders turn into W-Cu composite powder completely， which presents a special near-spherical structure of W coated Cu， the particle size is 20-60 nm， at the same time， the presence of Cu plays a catalytic role on the reduction of tungsten oxide.
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2017, Vol. 27 
