Effect of heat treatment on surface smoothness of silver coated copper powder
To solve the application problem of silver-clad copper powder in conductive paste,the present study prepared silver-clad copper powder by the combination of electroless plating and dipping method.By controlling the heat treatment process,the flatness and smoothness of the surface of the silver plating layer the smooth was improved.By scanning electron microscopy and resistance tester,the effects of heat treatment process on the morphology,oxidation resistance,conductivity and oil absorption rate of the silver-clad copper powder coated layer were investigated.It is found that the combination of electroless plating and dipping method can prepare silver-clad copper powder with a smoother surface.With the increase of heat treatment temperature,the silver layer becomes smoother and flatter.However,when the heat treatment temperature is 700 ℃,the silver-clad copper powder will be cracked and agglomerated.With the extension of the heat treatment time,the structure of the silver-clad copper powder will be distorted and agglomerated.Studies have shown that controlling the heat treatment process can improve the surface smoothness of the silver layer,thereby reducing its oil absorption rate in the electronic paste,and improving oxidation resistance and electrical conductivity.When the heat treatment temperature is 600℃ and the holding time is 10 min,the prepared silver-clad copper powder presents the best morphology and comprehensive performance.
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