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Electrolytic copper powder and manufacturing method thereof

A technology of electrolytic copper powder and a manufacturing method, which is applied in the field of electrolytic copper powder, can solve the problems of reduced productivity, agglomeration fluidity, and increased quality deviation of molded bodies, and achieve high industrial applicability, high-strength molding, and high apparent density Effect

Inactive Publication Date: 2011-04-13
FUKUKA METAL FOIL & POWDER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, when the branches of the electrolytic copper powder are developed by the above-mentioned conventional method, the degree of entanglement between the electrolytic copper powder is more than necessary, so there is a problem that aggregation is likely to occur and the fluidity is reduced, making it very difficult to handle. Not only will the productivity decrease, but also the compression ratio will increase when the aggregates of these electrolytic copper powders are compression-molded, which will lead to a decrease in the molding speed and an increase in the quality deviation of the molded body.

Method used

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  • Electrolytic copper powder and manufacturing method thereof
  • Electrolytic copper powder and manufacturing method thereof
  • Electrolytic copper powder and manufacturing method thereof

Examples

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Embodiment 1

[0050] First, a sulfuric acidic copper sulfate aqueous solution composed of a copper concentration of 10±2 g / L and a sulfuric acid concentration of 90±20 g / L was prepared, and the additives listed in Table 1 were added to prepare an electrolytic solution. Then, after immersing the cathode and anode made of tough pitch copper in an electrolyte solution maintained at a liquid temperature of 35 to 45° C., the 2 The current density flows through the two poles, thus, electrolytic copper powder is deposited on the cathode.

[0051] Then, the electrolytic copper powder deposited on the cathode was washed with water, neutralized, dried, and then passed through a 60-mesh sieve to obtain electrolytic copper powder having a particle diameter of 250 μm or less.

Embodiment 2～25、 comparative example 1～7

[0053] Electrolytic copper powder was produced in the same manner as in Example 1 above except that the additives and the addition amounts of the electrolytic solution in the above-mentioned Example 1 were changed as shown in Table 1.

Embodiment 26～28、 comparative example 8～10

[0055] Change the copper concentration of the electrolytic solution in the foregoing Example 1 to 13 ± 1g / L (embodiment 26 and comparative example 8), 15 ± 1g / L (embodiment 27 and comparative example 9), 18 ± 1g / L ( In Example 28 and Comparative Example 10), except that the additives and their addition amounts were changed as shown in Table 1, electrolytic copper powder was produced in the same manner as in Example 1 above.

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Abstract

An aim of the invention is to obtain electrolytic copper powder which does not cause the branch development of the electrolytic copper powder to a degree higher than a necessary degree, has improved moldability compared with the traditional electrolytic copper powder and can be molded with a high strength. For improving the self-strength of the electrolytic copper powder and precipitating the electrolytic copper powder that can be molded with high strength, the electrolytic solution is a solution which is added with one or more than two components selected from tungstate, molybdate and sulfur-containing organic compound in water solution of copper sulphate in a manufacturing method for precipitating the electrolytic copper powder through current flow in the electrolytic solution with a purpose of dimension fining of the microcrystals that form the electrolytic copper powder.

Description

technical field [0001] The present invention relates to electrolytic copper powder and a method for producing the electrolytic copper powder. Background technique [0002] It is well known that when the cathode and anode are immersed in the electrolytic solution, the electrolytic copper powder precipitated on the cathode side has a dendritic shape and a large surface area, and has excellent formability and sinterability. It is used as a material for moldings such as oil-impregnated bearings, machine parts, brushes, and friction materials. [0003] In recent years, moldings formed by powder metallurgy have become porous, thinned, and complicated in shape. Therefore, molding with conventional electrolytic copper powder has become difficult, and people have been seeking to improve the performance of electrolytic copper powder. Formability. Electrolytic copper powder enables high-strength molding by improving formability. [0004] Here, as a production method for improving th...

Claims

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Application Information

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IPC IPC(8): B22F1/00C25C5/02
Inventor 和田润益冈佐千子
Owner FUKUKA METAL FOIL & POWDER CO LTD