Iron/copper composite powder for powder metallurgy and process for producing the same

A composite powder and powder metallurgy technology, applied in metal processing equipment, coating, transportation and packaging, etc., can solve the problems of radial compressive strength reduction, strength increase, and special sintering methods are not common, etc., to improve radial resistance Compression strength, increase powder density and reduce cost

Active Publication Date: 2012-06-13
JX NIPPON MINING & METALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the special sintering method of machining before sintering is not common in the former
In addition, the latter has the same purpose in terms of increasing the amount of copper, but the strength of the exposed surface part of the iron (mainly considering wear resistance) may be increased, but the strength of the sintered body itself cannot be improved
[0006] In view of this, attempts have been made to use copper-coated iron powder as the basic component and increase the ratio of copper, but the current situation is that the problems of reduced radial compressive strength, fluidity and apparent density of the sintered raw material powder have not been basically solved, and have not been solved. may not be able to meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Using a copper sulfate plating solution with a sulfuric acid concentration of 7 g / L, a chlorine concentration of 7 mg / L, and a copper concentration of 40 g / L, iron powder of -100 mesh was added to produce copper-coated iron powder. The amount of copper coating was 50% by weight Cu. After that, it was baked at 650° C. for 30 minutes in a reducing atmosphere, and then pulverized.

[0043] The apparent density, fluidity, and specific surface area of ​​the composite powder thus obtained were measured. The results are shown in Table 1. As shown in Table 1, the apparent density of the iron-copper composite powder of Example 1 is 2.23g / cm 3 , fluidity is 22.8s / 50g, specific surface area is 0.12m 2 / g, a good iron-copper composite powder was obtained.

[0044] In addition, using the iron-copper composite powder, 4% by weight of tin powder, 0.5% by weight of graphite powder, and 0.5% by weight of zinc stearate as a molding lubricant were added to the composite powder, and mi...

Embodiment 2

[0051] Using a copper sulfate plating solution with a sulfuric acid concentration of 7 g / L, a chlorine concentration of 7 mg / L, and a copper concentration of 40 g / L, iron powder of -100 mesh was added to produce copper-coated iron powder. The amount of copper coating was 50% by weight Cu. After that, it was baked at 700° C. for 30 minutes in a reducing atmosphere, and then pulverized. The apparent density (g / cm3) of the iron-copper composite powder thus obtained was measured 3 ), fluidity (s / 50g), specific surface area (m 2 / g). The results are shown in Table 1.

[0052] As shown in Table 1, the apparent density of the iron-copper composite powder of Example 2 is 2.22g / cm 3 , fluidity is 23.2s / 50g, specific surface area is 0.11m 2 / g, a good iron-copper composite powder was obtained.

[0053] In addition, using the iron-copper composite powder, 4% by weight of tin powder, 0.5% by weight of graphite powder, and 0.5% by weight of zinc stearate as a molding lubricant were a...

Embodiment 3

[0056] Using a copper sulfate plating solution with a sulfuric acid concentration of 7 g / L, a chlorine concentration of 7 mg / L, and a copper concentration of 40 g / L, iron powder of -100 mesh was added to produce copper-coated iron powder. The amount of copper coating was 50% by weight Cu. After that, it was baked at 750° C. for 30 minutes in a reducing atmosphere, and then pulverized. The apparent density (g / cm3) of the iron-copper composite powder thus obtained was measured 3 ), fluidity (s / 50g), specific surface area (m 2 / g). The results are shown in Table 1.

[0057] As shown in Table 1, the apparent density of the iron-copper composite powder of Example 3 is 2.27g / cm 3 , fluidity is 23.0s / 50g, specific surface area is 0.09m 2 / g, a good iron-copper composite powder was obtained.

[0058] In addition, using the iron-copper composite powder, 4% by weight of tin powder, 0.5% by weight of graphite powder, and 0.5% by weight of zinc stearate as a molding lubricant were a...

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Abstract

An iron / copper composite powder for powder metallurgy comprising a copper-coated iron powder as a major component. The composite powder comprises a copper-coated iron powder or a powder mixture of a copper-coated iron powder and an electrolytic copper powder, and is characterized by having a copper content of 45-70 wt.%, apparent density of 2.2 g / cm<3> or higher, and fluidity of 25 s / 50 g or lower. Also provided is a process for producing an iron / copper composite powder for powder metallurgy comprising a copper-coated iron powder as a major component, characterized by plating an iron powder with copper, sintering this copper-coated iron powder alone having a copper content of 45-70 wt.% or a mixture prepared by mixing the copper-coated iron powder with an electrolytic copper powder so as to result in a copper content of 45-70 wt.%, and pulverizing the sinter. By the process for producing a raw powder for powder metallurgy which comprises copper-coated iron as a major component and is for use in producing, e.g., a sintered oil-impregnated bearing, a raw sintering powder is obtained which is improved in flowability and apparent density and in sinter properties including ring compression strength. A cost reduction is also attained.

Description

technical field [0001] The present invention relates to an iron-copper composite powder for powder metallurgy whose main component is copper-coated iron powder used as a powder metallurgy raw material powder for sintering oil-impregnated bearings and the like, and a manufacturing method thereof. Background technique [0002] Copper-coated iron powder is generally used as a powder metallurgy raw material powder for sintering oil-impregnated bearings and the like used in IT-related equipment, automotive electrical equipment, and the like. Iron is mainly responsible for the strength of the bearing, and copper is responsible for corrosion resistance and wear resistance. Recently, for such copper-clad iron composite powders, it is required to increase the ratio of copper, thereby increasing wear resistance and corrosion resistance. [0003] At this time, simply increasing the ratio of copper will reduce the amount of iron, so the strength will naturally decrease. The strength e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F1/00C22C9/00B22F1/17
CPCC22C9/00C22C1/0425B22F1/025C22C30/02B22F1/17
Inventor 成泽靖
Owner JX NIPPON MINING & METALS CORP
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