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Dendritic crystal-shaped copper powder

A crystalline copper and dendritic technology, applied in the field of copper powder, can solve the problems of difficult handling, reduced fluidity, and easy agglomeration, etc., and achieve the effect of excellent conductivity

Inactive Publication Date: 2013-01-16
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] In the above-mentioned Patent Document 5, it is pointed out that if the branches of the electrolytic copper powder expand and the dendrites grow further, the electrolytic copper powder is entangled with each other more than necessary, agglomeration is likely to occur, and the fluidity is lowered, making it difficult to handle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] In 2.5m×1.1m×1.5m size (approximately 4m 3 ) in the electrolytic cell according to the distance between the electrodes is 5cm hanging set size is (1.0m * 1.0m) cathode plate and insoluble anode plate (DSE (manufactured by PERMELEC electrode company)) each 9 pieces, make the copper sulfate solution as electrolyte Circulation was performed at 30 L / min, the anode and the cathode were immersed in the electrolytic solution, a direct current was flowed therein for electrolysis, and powdery copper was deposited on the surface of the cathode.

[0082] At this time, the Cu concentration of the circulating electrolyte was adjusted to 5 g / L, sulfuric acid (H 2 SO 4 ) concentration is adjusted to 100g / L, and the current density is adjusted to 100A / m 2 , implement electrolysis for 1 hour.

[0083] In electrolysis, the copper ion concentration of the electrolytic solution between the electrodes is always kept lower than that of the electrolytic solution at the bottom of the electr...

Embodiment 2

[0087] Electrolytic copper powder was obtained in the same manner as in Example 1, except that the electrolysis time was 40 minutes and the circulating liquid volume was 20 L / min.

[0088] As a result of observing the thus obtained electrolytic copper powder using a scanning electron microscope (SEM), it was confirmed that at least 90% or more of the copper powder particles had one main axis and two or more branches branched obliquely from the main axis. And undergo three-dimensional growth of dendrites.

Embodiment 3

[0090] Electrolytic copper powder was obtained in the same manner as in Example 1, except that the electrolysis time was 40 minutes, the Cu concentration of the electrolytic solution was 1 g / L, and the circulating liquid volume was 10 L / min.

[0091] As a result of observing the thus obtained electrolytic copper powder using a scanning electron microscope (SEM), it was confirmed that at least 90% or more of the copper powder particles had one main axis and two or more branches branched obliquely from the main axis. And undergo three-dimensional growth of dendrites.

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Abstract

The invention provides a novel dendritic crystal-shaped copper powder having a more excellent conductivity, wherein a branch extended out of a main shaft is expanded further, the dendritic crystal grows at a degree higher than present. The invention provides a dendritic crystal-shaped copper powder mainly containing copper powder particles. When using a scanning-type electron microscope to observe the copper powder particles, a dendritic crystal shape formed by extending more than 2 branches from a limiting shaft appears, the thickness a of the shaft is between 0.3 micrometers and 5.0 micrometers, and the length b of a longest branch extended out of the shaft is between 0.6 micrometers and 10.0 micrometers.

Description

【Technical field】 [0001] This invention relates to the copper powder which can be suitably used as a material, such as an electroconductive paste, and relates to the copper powder (referred to as "dendritic copper powder") containing dendritic copper powder particle|grains especially. 【Background technique】 [0002] Conductive paste is a fluid composition in which a conductive filler is dispersed in a vehicle (ヒヒクル) composed of a resin binder and a solvent, and it is widely used in the formation of circuits and the formation of electrodes on the outside of ceramic capacitors Wait. [0003] This conductive paste is classified into a resin curing type and a firing type. Among them, the resin curing type secures conduction by crimping the conductive filler through the curing of the resin; The volatilization of the conductive filler sinters to ensure the conduction. [0004] The former resin-curable conductive paste is generally a paste-like composition containing a conductive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00
CPCY02P10/20B22F1/00H01B1/02
Inventor 藤本卓三轮昌宏胁森康成林富雄
Owner MITSUI MINING & SMELTING CO LTD