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Metal particle and its production method

A silver particle and particle size distribution technology, which is applied in metal processing equipment, metal/alloy conductors, cable/conductor manufacturing, etc., can solve problems such as silver powder aggregation and particle aggregation, and achieve the effect of high density, easy specific gravity, and excellent dispersion

Active Publication Date: 2015-10-07
NAMICS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The metal particles described in Patent Document 3 are also due to the fact that the core material is the center of the tree-shaped crystal growth, so the core material must be present, and the obtained metal particles have multiple protrusions in the shape of chestnuts, so it is easy to be affected by the chestnut. Spike-like protrusions are entangled with each other to cause agglomeration between particles
[0014] The silver powder described in Patent Document 4 does not require a core substance, but since the dendrites grow thinly in the shape of needles, it is easy to cause aggregation between the silver powders due to the intertwining of the thin needle-like dendrites.

Method used

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  • Metal particle and its production method
  • Metal particle and its production method
  • Metal particle and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] After weighing silver nitrate aqueous solution 10kg (concentration 10mol% / L), citric acid aqueous solution 4kg (concentration 10mol% / L), 25 ℃ of pure water 20kg respectively, drop in the stainless steel tank of 50 liters (L), at room temperature ( 25° C.±10° C.) was stirred for 30 minutes using a stirrer (manufactured by Shimazaki Corporation, trade name: JETAJITER) to prepare a mixed solution of silver nitrate and citric acid.

[0104] Then, after weighing 17 kg of ascorbic acid aqueous solution (L-ascorbic acid aqueous solution; concentration 5mol% / L) and 300 kg of pure water at 25° C., they were dropped into a 450-liter stainless steel reaction tank, and at room temperature (25° C.±10° C.), use It was prepared by stirring for 30 minutes with a mixer (manufactured by Shimazaki Corporation, brand name: JETAJITER).

[0105] Then, using a 600mm diameter stirrer (500rpm) with 4 stainless steel blades, in the prepared ascorbic acid aqueous solution, a mixed solution of sil...

Embodiment 2

[0140] The volume cumulative particle diameter D 50 0.67μm silver particles. The SA value of the silver particle of Example 2 measured similarly to Example 1 was 20.

Embodiment 3

[0142] The volume cumulative particle diameter D was obtained in the same manner as in Example 1, except that the pH of the mixed solution of silver nitrate, citric acid, and ascorbic acid after the reduction reaction was adjusted to be more than 2 but not more than 3. 50 Silver particles of 3.32 μm. The SA value of the silver particle of Example 3 measured similarly to Example 1 was 28.

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Abstract

An object is to provide a metal particle which is a non-nucleated, spherical porous material having continuous open pores, and which is formed from dendritic crystals which have grown uniformly outward from the center without requiring a nucleating agent, and a method for producing the same. A method for producing a metal particle comprises the steps of: mixing a metal salt and a polycarboxylic acid in a liquid phase; adding a reducing agent to the resultant mixture to deposit metal particles; and drying the deposited metal particles. The metal particle produced by the method, which is a non-nucleated, spherical porous material having continuous open pores, is unlikely to suffer bonding or aggregation of the metal particles and exhibits excellent dispersibility, and, when the metal particle is used in a conductive composition, such as a conductive paste, a cured product having satisfactory conduction properties can be obtained at a relatively low temperature, making it possible to easily control the specific gravity or resistance.

Description

technical field [0001] The present invention relates to a metal particle which is a coreless spherical open connected porous body and a method for producing the same. More specifically, the present invention relates to a metal particle in which crystal growth proceeds uniformly in a tree form from the center outward and has a fine concave-convex structure on a spherical surface, and a method for producing the same, and a method for producing the same. Background technique [0002] Conventionally, fine particle silver powder obtained by growing crystals such as silver or copper in a tree shape (dendrite shape) on an electrode plate by an electrolytic method is known (Patent Document 1). In addition, it is also known that a crystal such as silver or copper is grown from the core material in a dendrite (dendrite shape) by using the core material as the center by an electroless method, and the protrusions extending radially and the gaps located in the protrusions are also known....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/00B22F9/24H01B1/22H01B5/00H01B13/00B22F1/05B22F1/052
CPCB22F9/24B22F1/0011B22F1/0014B22F3/11B22F9/18C22C1/02C22C5/02C22C5/04C22C5/06C22C9/00C22C19/03H01B1/02H01B1/22Y10T428/12B22F1/05B22F1/052B22F1/00H01B5/00
Inventor 高桥友之吉井明人
Owner NAMICS CORPORATION
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