Patent classifications
B22F2009/042
Silver flake powder and production method thereof, and electrically conductive paste
To provide a flaky silver powder having a tapped density of from 0.8 g/mL to 1.9 g/mL, and a cumulative 50th percentile particle diameter (D.sub.50) of from 2 m to 7 m, where the cumulative 50th percentile particle diameter (D.sub.50) is measured by laser diffraction or laser scattering particle size analysis.
METHOD OF PRODUCING SILVER POWDER
A method of producing a silver powder includes: adding a reductant to a silver ammine complex aqueous solution to obtain a first liquid; adding a surface treatment agent, in an amount of 0.05 to 0.15 wt % relative to weight of silver contained in the silver ammine complex aqueous solution, to the first liquid to obtain a second liquid; obtaining a first silver powder from the second liquid and drying; and stirring the first powder, a lubricant, and media inside of a vessel to obtain a second silver powder. A specific surface area diameter is 1.3 to 2.0 m. A diameter at a cumulative value of 50% in a volume-based particle size distribution is 1.5 to 3 times the specific surface area diameter. Additive amounts of the lubricant and the surface treatment agent are, in total, 0.1 to 0.4 wt % relative to weight of silver in the first silver powder.
SILVER FLAKE POWDER AND PRODUCTION METHOD THEREOF, AND ELECTRICALLY CONDUCTIVE PASTE
To provide a flaky silver powder having a tapped density of from 0.8 g/mL to 1.9 g/mL, and a cumulative 50th percentile particle diameter (D.sub.50) of from 2 m to 7 m, where the cumulative 50th percentile particle diameter (D.sub.50) is measured by laser diffraction or laser scattering particle size analysis.