Fine particulate silver powder and production method thereof

a technology of production method, which is applied in the direction of coatings, etc., can solve the problems of significant factor of decreasing product yield, achieve low impurity content, achieve high dispersibility, and efficiently obtain fine particulate silver powder

Inactive Publication Date: 2007-04-12
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0034] The fine particulate silver powder according to the present invention is fine as never present conventionally, has a high dispersibility and has a small impurity content, and it can be understood that such a silver pow

Problems solved by technology

Therefore they were unsuitable for the recent fine-pitched circuit formation, and made a significant factor of decreasing product yield.
In the meantime, the following

Method used

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  • Fine particulate silver powder and production method thereof
  • Fine particulate silver powder and production method thereof
  • Fine particulate silver powder and production method thereof

Examples

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Effect test

example 1

[0041] In this example, a fine particulate silver powder was produced using the production method stated above and the properties of the obtained fine particulate silver powder were measured. And further, a silver paste was produced with the fine particulate silver powder and a test circuit was formed and the conductor resistance and sintering starting temperature were measured.

[0042] First, 63.3 g of silver nitrate was dissolved in 9.7 liters of pure water to prepare a silver nitrate aqueous solution, and 235 ml of 25 wt % concentration ammonia water was added thereto at once and agitated and a silver ammine complex aqueous solution was obtained.

[0043] This silver ammine complex aqueous solution was introduced into the first flow path a of 13 mm inside diameter shown in FIG. 1 at a flow rate of 1,500 ml / sec and a reducing agent was flowed from the second flow path b at a flow rate of 1,500 ml / sec, and they were contacted at the joining point m at a temperature of 20° C. and a fin...

example 2

[0046] In this example, a fine particulate silver powder was produced using the production conditions different from those of Example 1 and the properties of the obtained fine particulate silver powder were measured. And further, a silver paste was produced with the fine particulate silver powder and a test circuit was formed and the conductor resistance and sintering starting temperature were measured.

[0047] First, 63.3 g of silver nitrate was dissolved in 3.1 liters of pure water to prepare a silver nitrate aqueous solution, and 235 ml of 25 wt % concentration ammonia water was added thereto at once and agitated and a silver ammine complex aqueous solution was obtained.

[0048] This silver ammine complex aqueous solution was introduced into the first flow path a of 13 mm inside diameter shown in FIG. 1 at a flow rate of 1,500 ml / sec and a reducing agent was flowed from the second flow path b at a flow rate of 1,500 ml / sec, and they were contacted at the joining point m at a temper...

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Abstract

An object of the present invention is to provide a silver powder which is an unprecedentedly fine particulate silver powder, has a dispersibility more approximate to monodispersibility resulting less aggregation, and has a low impurity content.
To achieve the above object, a fine particulate silver powder having unprecedented powder properties in which: a. the average particle diameter DIA of the primary particles obtained by image analysis of a scanning electron micrograph is 0.6 μm or less; b. the crystallite diameter is 10 nm or less; c. the sintering starting temperature is 240° C. or less; and d. the carbon content is 0.25 wt % or less is obtained by allowing a silver ammine complex aqueous solution S1 to flow in a certain flow path (hereinbelow referred to as “first flow path”) providing a second flow path b which joins the first flow path a on its way and allowing an organic reducing agent and additives S2, if required, to flow into the first flow path a through the second first flow path b, and contacting and mixing them at the joining point of the first flow path a and the second flow path b to allow reduction and deposition of particles, and washing the particles with an excess amount of an alcohol.

Description

TECHNICAL FIELD [0001] The invention of this application relates to a fine particulate silver powder and a production method of the fine particulate silver powder. Particularly, the present invention relates to a fine particulate silver powder having a low impurity content. BACKGROUND ART [0002] Conventionally, for the production of a silver powder, wet reduction process has been adopted in which an aqueous solution of silver ammine complex is produced with a silver nitrate solution and ammonia water, and an organic reducing agent is added to this as described in Patent Document 1. In late years, these silver powders are used for forming electrodes and circuits of chip parts, plasma display panel, etc. as main field of application. [0003] [Patent document 1]: Japanese Patent Laid-Open Publication No. 2001-107101 [0004] Therefore, as for such electrodes and circuits, drastic fine production of the electrodes and circuits are demanded, and high reliability has come to be demanded alon...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00C22C5/06
CPCB22F9/24C22C5/06B22F1/00
Inventor SASAKI, TAKUYAKATO, MASASHIYOSHIMARU, KATSUHIKO
Owner MITSUI MINING & SMELTING CO LTD
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