Abstract

Cu-Al_20_3 composite powders were prepared by hydrogen reduction of Cu2+ from ammoniacal copper sulfate solution on alumina core using autoclave. The copper reduction rate and the properties of copper layer were investigated using Scanning Electron Microscope(SEM), X-ray diffractometer, size and chemical analyzers. The reduction rate of Cu2+ showed the maximum value when the molar ratio of [NH_3]/[Cu2+] was 2. In order to prevent the agglomeration of Cu powder and ethane reduction rate, Fe2+ and anthraquinone which act as catalysis were added in the solution. Catalysis was effectively chanced with the addition of two elemerts at a time. Optimum conditions obtained in this study were hydrogen reduction temperature of 205cireC, stirring speed of 500 rpm and hydrogen partial pressure of 300 psi. Obtained Cu-Al_20_3 composite Powders were found to have the uniform and continuous copper coating layer of nodule shape with 3~5 mum thickness.