还原法制备银包铜粉主盐添加工艺及镀层沉积过程研究

Adding Processes of Silver Solution and the Deposit Process of Silver Coating during Reduction Preparation of Silver-Coated Copper Powders

用葡萄糖作为还原剂制备银包铜粉。在还原法镀银过程中,主盐溶液以不同的工艺添加可得到不同微观形貌和表观颜色的银包铜粉,用扫描电镜、能谱仪对银包铜粉进行表征,并用滴定法计算不同添加工艺制备的银包铜粉的含银量,确定了较优的主盐添加工艺;同时,通过在施镀过程中阶段性取粉观察,对银包铜粉镀层的沉积过程进行了分析。

The silver-coated copper powders were prepared by a reduction method, using glucose as the reductant. The different adding processes of silver-ammonia solution varied the micro-morphology and appearance color of the powders. The coated powders were characterized by SEM and EDS. The silver contents of different adding processes were calculated by titration. Thus the optimal adding process was determined. Meanwhile, the silver coating deposit process was analyzed by observation of the powders taken out from the solution at different stages during silver plating.