| 摘要 |
PROBLEM TO BE SOLVED: To provide a silver powder manufacturing method by which non-reducing reaction does not occur according to the amount of addition, the kind and amount of the dispersing agent are not limited; there problems are caused in the conventional manufacturing method in which the dispersing agent is added to a reaction liquid before reduction; and the silver powder excellent in dispensability is obtained and the silver powder to be obtained thereby. SOLUTION: This silver powder is manufactured by adding an aqueous solution containing a reducing agent to a water-based reaction system containing silver complex salt or silver oxide or both at a rate of >=1 equivalent/min, and either mixing and grinding wet cakes having a water content of 20 to 80% obtained by filtrating and washing slurry containing the silver powder with a mixer or mixing and griding the wet cakes together with the dispersing agent within the mixer after reduced. The silver powder has a characteristic excellent in dispesibility exhibiting a tap density of >=2g/cm<3> , an average particle size by the laser diffraction method of 0.1 to 5μm and a specific surface area of <=5m<2> /g. After this silver powder is pasted, a paste 3 is then piled on a 96% alumina substrate 1, on which a mending tape 2 is stuck for example, is stretched with a glass bar 4, is printed, then the tape is peeled and thereafter a paste coating film 5 is dried, thereby the cahracteristc of a surface roughness Ra of <=2μm and a coating density of >=4.5g/cm<3> is obtained.
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