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US 2024/0227002 A9Published application
Silver powder and method of producing same
AssigneeDowa Electronics Materials Co., Ltd.
InventorsKaori TOKUSADA, Hikaru HAYASHIDA
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Abstract
Provided are a silver powder having powder physical properties enabling reduction of volume resistivity after firing and a method of producing this silver powder. The silver powder has a tap density of 4.8 g/mL or more, a TAP/D50 value (value determined by dividing the tap density (g/mL) by the volume-based median diameter (μm)) of not less than 7 and not more than 15, and a specific surface area of not less than 0.75 m2/g and not more than 1.3 m2/g.
Claims8
A silver powder having:
- a tap density of 4.8 g/mL or more;
- a TAP/D50 value that is a value determined by dividing the tap density, in units of g/mL, by volume-based median diameter, in units of μm, of not less than 7 and not more than 15;
- and
- a specific surface area of not less than 0.75 m2/g and not more than 1.3 m2/g.
1 more element
A method of producing a silver powder comprising:
- a milling step of using high-pressure airflow to accelerate and mill a silver powder produced by a wet reduction method;
- and
- a classification step of classifying the silver powder, performed after the milling step, wherein
- the milling step is performed with the silver powder having a concentration of 0.2 kg/m3 or less, and
- the classifying is performed such that after the classification step, the silver powder has powder physical properties of:
- a tap density of 4.8 g/mL or more;
- a TAP/D50 value that is a value determined by dividing the tap density by volume-based median diameter, in units of μm, of not less than 7 and not more than 15;
- and
- a specific surface area of not less than 0.75 m2/g and not more than 1.3 m2/g.
6 more elements
Dependencies are inferred from the claim text.