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In this research, the chemical synthesis and densification behavior of Ag/ZnO metal-matrix composites were investigated. The initial precipitates were obtained by adding ammonium carbonate solution to silver and zinc nitrate solutions. The precipitates consisted of silver and zinc carbonates. The thermal behavior of the precipitates was studied using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The TGA curve showed three distinguishable mass-loss stages, related to the evaporation of physically adsorbed water and also the decomposition of silver and zinc carbonates into silver and zinc oxides, respectively. The mass-loss stages were associated with three endothermic reactions. According to the thermal-analysis results, the precipitates were calcined at 600 °C. The compressibility behavior of the synthesized Ag/ZnO powders was evaluated using the Heckel, Panelli and Ge models. The compaction data of the powders was best fitted to the Heckel equation. The synthesized powders were sintered at 930 °C. The results showed that by increasing the cold-compaction magnitude prior to sintering, the sinterability of the powders was enhanced. The microstructural evaluation of the synthesized composites carried out with a scanning electron microscope (SEM) confirmed a fine and homogenous dispersion of ZnO within the silver matrix.

Chemical synthesis and densification behavior of Ag/ZnO metal-matrix composites