Preparation method of flaky silver-coated nickel powder

The invention discloses a preparation method of flaky silver-coated nickel powder with high dispersion and good conductivity. The preparation method comprises the steps of adopting flaky nickel powderas a base material, and sequentially carrying out sensitization and activation, pre-replacement, chemical silvering, magnetic separation, drying, grinding, sieving and other process steps to obtain the target product. The prepared product is good in silver coating effect, high in dispersion and excellent in conductivity. The preparation method has the advantages of mild reaction conditions, low requirement on equipment, controllability in silver content and easiness in industrial large-scale production; and the flaky silver-coated nickel prepared through the method provided by the invention has the D50 being 0.5 to 50mum, the average thickness being smaller than 7mum, and the silver content being 1 to 20 percent. 本发明公开了种高分散、导电性能好的片状银包镍粉体的制备方法，以片状镍粉为基材，先后通过敏化活化、预置换、化学镀银、磁性分离、烘干研磨过筛等工艺步骤获得目标产品；所制备的产物银包覆效果好、分散性高且导电性