Research on Finely Dispersed Spherical Silver Powder

Finely dispersed spherical silver powder were synthesized from silver nitrate by liquid-phase reduction in the liquid phase with formaldehyde as the reducing agent,succinic acid as the dispersant.The effects of the dosage of succinic acid,the concentrations of silver nitrate and formaldehydeand pH value on the size of silver powder were studied.The silver powder were examined and characterized with laser size distribution analyser,XRD and SEM.The studies indicate highly pure finely dispersed spherical silver powder with the particle size between 2 μm and 3 μm could be prepared under the following condition that temperature was 20～25 ℃,silver nitrate concentration was 0.01～0.07 mol/Land formaldehyde concentration was 0.48～13.32 mol/L.