【摘要】 采用湿法还原反应,把钯银铵络离子还原成粉末;通过在反应液中加入高分子添加剂及调整反应液流动形态等来控制合金粉的形貌及粒径分布;在还原釜内表面喷涂不粘且防腐涂料,防止钯银合金粉发生银镜反应.采用该工艺生产的钯银合金粉纯度高(大于99.93％),有害杂质铁的质量分数小于0.0108％;合金粉颗粒呈球状,粒径在0.2～0.6μm之间的颗粒占95％以上,粒径在0.45μm附近的颗粒的相对百分率频率最大.该粉末完全符合电子元件的要求.更多还原

【Abstract】 The ultra-fine Pd-Ag powder is made from [ Ag (NH3 )2 ]+ OH and Pd(NO3)2(NH3)4 by reduction-reaction; the particle size of the Pd-Ag alloy powder is controlled by addition of some high molecular organic compound and by flowing shape of reaction fluid. The inner face of the reactor is sprayed with a special paint to avoid the reaction of it on the solution. The purity of the Pd-Ag alloy powder produced by the process is more than 99- 93% and the mass fraction of Fe in the powder is less than 0. 0108%. The particles of the powder are globular shape. The numbers of the particles whose diameter is between 0. 2 μm and 0. 6 μm are more than 95% of all the particles, and the mean diameter of the particles is about 0. 45μm. The Pd-Ag powder can be used to making electronic elements.更多还原