Silver powder, production method thereof, and conductive paste
AssigneeDowa Electronics Materials Co., Ltd.
InventorsMASANORI FUJII, YUMA HIGASHI
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Abstract
Provided is silver powder including silver particles having closed pores inside the particles, wherein when cross sections of the silver particles are observed at a magnification of 10,000, an average of numbers of the pores having Heywood diameters of 200 nm or greater relative to an area of the cross sections is 0.01 pores/μm2 or less, and wherein when the cross sections of the silver particles are observed at a magnification of 40,000, an average of numbers of the pores having Heywood diameters of 10 nm or greater but less than 30 nm relative to the area of the cross sections is 25 pores/μm2 or more.
Claims8
Silver powder comprising
- silver particles having closed pores inside the particles,
- wherein when cross sections of the silver particles are observed at a magnification of 10,000, an average of numbers of the pores having Heywood diameters of 200 nm or greater relative to an area of the cross sections is 0.01 pores/μm2 or less, and
- wherein when the cross sections of the silver particles are observed at a magnification of 40,000, an average of numbers of the pores having Heywood diameters of 10 nm or greater but less than 30 nm relative to the area of the cross sections is 25 pores/μm2 or more.
A method for producing silver powder including silver particles having closed pores inside the particles, the method comprising
- adding a reducing agent-containing solution containing aldehyde as a reducing agent to an aqueous reaction system containing silver ions and mixing the aqueous reaction system,
- wherein a liquid temperature of the aqueous reaction system is maintained to be 33° C. or lower until 90 seconds from start of the mixing.
Dependencies are inferred from the claim text.