置换还原法制备银包铜粉工艺及性能研究

Technologies and Performances of Silver-coated Copper Powder Prepared by Displacement Reaction

采用EDTA为络合剂,利用置换还原法制备银包铜粉。研究了还原剂的浓度,分散剂以及络合剂的浓度对银包铜粉性能的影响。实验结果表明,采用EDTA为络合剂,所得粉末表层结构致密,包覆均匀。当c(EDTA)为0.12mol/L,c(葡萄糖)为0.12mol/L,同时采用超声波分散,所得银包铜粉导电性最好,镀银层致密,粉末为银白色,包覆率高,抗氧化性最佳。

Silver-coated copper powder was prepared by displacement reaction using EDTA as the complexing agent.The effects of the concentration of reducing agent,dispersant as well as the complexing agent on the performances of silver-coated copper powder were investigated.The results showed that the powder prepared by displacement reaction using EDTA as the complexing agent was in dense and uniform state.When the concentration of complexing agent and reducing agent was all 0.12 mol/L and the ultrasonic dispersion was conducted,the prepared silver-coated copper powder possessed optimal conductivity with dense structure,silvery white color,high clad ratio and best antioxidation.