Fine-grain silver powder and process for producing the same

A manufacturing method, technology of silver powder, applied in the direction of nanotechnology, nanotechnology, metal processing equipment, etc. for materials and surface science, which can solve problems such as low junction

Inactive Publication Date: 2009-01-28
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to obtain silver powder with low caking property, in terms of production conditions, a reaction system with rapid reduction has to be adopted. As a result, although the crystallinity is low, only silver powder with obvious aggregation can be obtained.

Method used

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  • Fine-grain silver powder and process for producing the same
  • Fine-grain silver powder and process for producing the same
  • Fine-grain silver powder and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this example, fine particle silver powder was manufactured by the above-mentioned manufacturing method, and the powder body characteristic of the obtained fine particle silver powder was measured. Furthermore, silver paste was produced using fine particle silver powder, a test circuit was formed, and the conductor resistance and sintering start temperature were measured.

[0041] First, 63.3 g of silver nitrate was dissolved in 9.7 liters of pure water to prepare an aqueous solution of silver nitrate, and 235 ml of ammonia water with a concentration of 25 wt % was added at one time to the aqueous solution of silver nitrate, and the aqueous solution of silver ammonia complex was obtained by stirring.

[0042] This silver ammonium complex aqueous solution is imported with the flow rate of 1500ml / sec to such as figure 1 In the shown first flow path a with an inner diameter of 13mm, the reducing agent flows from the second flow path b at a flow rate of 1500ml / sec, and co...

Embodiment 2

[0046] In this example, fine particle silver powder was produced under different production conditions from that of Example 1, and the powder properties of the obtained fine particle silver powder were measured. Furthermore, silver paste was produced using fine-particle silver powder, a test circuit was formed, and the conductor resistance and sintering start temperature were measured.

[0047] First, 63.3 g of silver nitrate was dissolved in 3.1 liters of pure water to prepare an aqueous solution of silver nitrate, and in this aqueous solution of silver nitrate, 235 ml of ammonia water with a concentration of 25 wt % was added at one time, and the aqueous solution of silver ammonia complex was obtained by stirring.

[0048] This silver ammonium complex aqueous solution is imported with the flow rate of 1500ml / sec to such as figure 1 In the shown first flow path a with an inner diameter of 13mm, the reducing agent flows from the second flow path b at a flow rate of 1500ml / sec,...

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Abstract

Fine-grain silver powder that has a grain size of minuteness not known in the prior art, exhibiting dispersion close to monodispersion with reduced grain aggregation. For obtaining the fine-grain silver powder, an aqueous solution of silver ammine complex (S1) is caused to flow through given flow channel (hereinafter referred to as 'first flow channel'). Second flow channel (b) is disposed so as to join the middle of the first flow channel (a), and an organic reducing agent optionally together with an additive (S2) is caused to flow through the second flow channel (b). At confluence (m) of the first flow channel (a) and the second flow channel (b), contact and mixing is carried out so as to effect reduction deposition. Thus, there is obtained fine-grain silver powder of such powder characteristics not known in the prior art that the average diameter of primary grain (DIA) obtained by an image analysis of scanning electron microscope images is 0.6 m or less (a), the crystallite diameter 10 nm or less (b) and the sintering initiation temperature 240 DEG C or below.

Description

technical field [0001] The invention relates to a microparticle silver powder and a method for manufacturing the microparticle silver powder. Background technique [0002] As described in Patent Document 1, in the conventional production of silver powder, a wet reduction process in which an aqueous silver ammonia complex solution is produced with silver nitrate solution and ammonia water and an organic reducing agent is added to the aqueous silver ammonia complex solution has been used. In recent years, these silver powders are mainly used in the formation of electrodes or circuits of chip parts, plasma display panels, and the like. [0003] Patent Document 1: JP-A-2001-107101 [0004] Therefore, in the above-mentioned electrodes and circuits, it is required to greatly reduce the size of the formed circuits and electrodes, and to increase the density and precision of wiring and to have high reliability. [0005] However, the average particle size D of the primary particle ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/24B22F1/054
CPCB22F9/24B22F1/0018B82Y30/00B22F1/054B22F1/00
Inventor 佐佐木卓也加藤政志吉丸克彦
Owner MITSUI MINING & SMELTING CO LTD
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