Preparation of Ag-NiO composite Powders by Spray Pyrolysis

Thermal properties of AgNO3, Ni(NO3) 2 6H2O and the mixed nitrates of Ag and Ni were investigated by using thermogravimetric analysis and differential thermal analysis. The composite powders of Ag-NiO were prepared from the nitrate solutions by spray pyrolysis. The spray pyrolysis experiments were carried out to prepare the composite powders with 90~10 % Ag-NiO composition, which was a useful material in electronic industry.In thermal analysis of the mixed nitrates of AgNO3 and Ni(NO3)2 6H2O, the melting point and the beginning temperature of the thermal decomposition were found to be lower than those temperatures of AgNO3. When the reaction temperature in the spray pyrolysis was above 1,223 K, the produced composite powders became spherical particle with mean diameter of about 2 microns, while the products with rough surface were obtained at a lower reaction temperature. The products with different particle diameter could be prepared by spray pyrolysis under different spraying conditions. The composite powders became finer with an increase in temperature and with a decrease in Ag concentration