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Process for producing sintered bronze alloy powder

A manufacturing method and technology for sintering bronze, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of high manufacturing cost and not necessarily satisfactory

Active Publication Date: 2014-04-02
JX NIPPON MINING & METALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bronze powder for sintering is required to be basically completely bronze powder, so there is a problem that the production cost is high and it may not be satisfactory.

Method used

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  • Process for producing sintered bronze alloy powder
  • Process for producing sintered bronze alloy powder
  • Process for producing sintered bronze alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048]Mix 91% by weight of electrolytic copper powder of -200 mesh (-75 μm) with 9% by weight of tin powder of -350 mesh (-45 μm) to obtain Cu-9% Sn mixed powder, which is mixed in a reducing atmosphere at 500 °C for 30 minutes pre-sintering.

[0049] After this pre-sintering, it was lightly pulverized, and the coarse powder was removed with a 100-mesh (150 μm) sieve. This powder was further subjected to main sintering at 650° C. for 30 minutes in a reducing atmosphere. Thereafter, it was pulverized, and coarse powder was removed through a 100-mesh (150 μm) sieve to obtain sintered bronze alloy powder.

[0050] Table 1 shows the powder properties (apparent density, fluidity, and particle size distribution) of the -200 mesh (-75 μm) electrolytic copper powder used in Example 1 above. The powder itself has poor fluidity and does not flow. The micrograph of the electrolytic copper powder is as follows figure 1 shown. The apparent density is 2.10g / cm 3 . In addition, electr...

Embodiment 2

[0062] Mix 91% by weight of electrolytic copper powder of -200 mesh (-75 μm) with 9% by weight of tin powder of -350 mesh (-45 μm) to obtain Cu-9% Sn mixed powder, which is heated in a reducing atmosphere at 300 °C for 30 minutes pre-sintering. Then, it was sieved with a 100-mesh (150 μm) sieve to remove coarse powder. This powder was further subjected to main sintering at 700° C. for 30 minutes in a reducing atmosphere. Thereafter, it was pulverized, and coarse powder was removed through a 100-mesh (150 μm) sieve to obtain sintered bronze alloy powder.

[0063] The results are shown in Table 1, Table 2 and Table 3. As the raw material copper powder, the same copper powder as in Example 1 was used. As shown in Table 2, the apparent density is 2.34g / cm 3 , the fluidity is 21.4 seconds / 50g, and the fluidity that can be used is obtained.

[0064] In addition, as shown in Table 3, the powder green strength (Rattola value) of the sintered bronze alloy powder was 2.3%. It can ...

Embodiment 3

[0066] Add -350 mesh (-45μm) tin powder to tin-plated copper powder with a Sn content of 5.5% obtained by tin-plating electrolytic copper powder of -200 mesh (-75μm) to adjust the ratio of copper to tin to 91 % by weight: 9% by weight to obtain a mixed powder, which was pre-sintered at 500° C. for 30 minutes in a reducing atmosphere. Then, this was pulverized lightly, coarse powder was removed with a 100-mesh (150 μm) sieve, and the powder was subjected to main sintering at 650° C. for 30 minutes in a reducing atmosphere. Thereafter, it was pulverized, and coarse powder was removed through a 100-mesh (150 μm) sieve to obtain sintered bronze alloy powder.

[0067] The results are shown in Table 1, Table 2 and Table 3. As the raw material copper powder, the same copper powder as in Example 1 was used. As shown in Table 2, the apparent density is 1.95g / cm 3 , The fluidity is 33.6 seconds / 50g, although it is worse than Examples 1 and 2, but the fluidity that can be used is stil...

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Abstract

A process for producing a sintered bronze alloy powder, characterized by comprising: a provisional sintering step in which a copper / tin mixed powder prepared by mixing a 200-mesh powder of electrolytic copper with a 350-mesh tin powder so as to result in a tin powder proportion of 8-11 wt.% is sintered at 300-600ºC in a reducing atmosphere and then pulverized; a final sintering step in which the provisionally sintered powder is sintered again at 500-700ºC in a reducing atmosphere; and thereafter pulverizing and sieving the sintered powder. Provided is a bronze alloy powder which has a microfine particle size and is suitable for producing oil-impregnated sintered bearings having a reduced size. Although a microfine raw-material powder, the bronze alloy powder has flowability that causes no decrease in productivity.

Description

technical field [0001] The present invention relates to a technology for providing a bronze-based sintered powder used for sintering raw material powder for powder metallurgy such as an oil-impregnated bearing, and particularly a bronze alloy powder having a fine particle size suitable for producing a miniaturized sintered oil-impregnated bearing. Background technique [0002] Sintered oil-impregnated bearings are produced by powder metallurgy, whereby the gaps (pores) remaining between the initial raw material powder particles in the sintered body are used to impregnate lubricating oil into the pores so that they can be used without oil supply. [0003] As a material suitable for sintered oil-impregnated bearings, an alloy (bronze alloy) containing about 10% tin in copper is widely used. As the raw material powder of the bronze-based sintered oil-impregnated bearing, mixed powder of copper powder and tin powder or bronze alloy powder is used. [0004] In the case of mixed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F1/00B22F1/02B22F1/142
CPCC22C1/0425B22F2998/10B22F2999/00B22F1/0085B22F1/142B22F3/10B22F9/04B22F2201/01
Inventor 成泽靖
Owner JX NIPPON MINING & METALS CORP
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