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Copper-tin localized alloying powder for oil-retaining bearing and preparation method thereof

An alloy powder, copper-tin technology, applied in the field of copper-tin local alloy powder for oil-containing bearings and its preparation, can solve the problems of low requirements, major segregation, poor forming, etc., and achieve the effect of ensuring the connection of oil holes

Active Publication Date: 2010-11-10
SHANGHAI QIAODUN METAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the above-mentioned preparation of powder by spraying has the advantages of simple process and no segregation, the shape of the powder is generally spherical, which is easy to cause poor forming defects; at the same time, due to its single process, it is important for the manufacture of oil-impregnated bearings. Important parameters such as packing density and shrinkage rate cannot be adjusted, so they cannot meet the production needs of oil-impregnated bearings
Since the copper and tin have formed all alloys during the melting process of the spray method, it will cause the tin to be difficult to separate and flow during the sintering process of the oil-impregnated bearing products, resulting in the formation of dead pores
However, the purity of the main components of the powder produced by gas atomization is not high, and the purity of the water atomization powder is not high, but the oxygen content is also high
[0010] In addition to the production of copper-tin alloy powder by the spray method, for those with low requirements and the existing raw materials cannot meet the needs, the mixed method is usually used to produce copper-tin alloy powder. The main disadvantages of this method are: major segregation, large shrinkage, Therefore, the copper-tin mixed powder produced by this method uses less

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1.1 Classification of electrolytic copper powder: classify electrolytic copper powder, divide electrolytic copper powder into 3 grades, and mix according to the percentage in the following table:

[0046] Types of electrolytic copper powder

1

2

3

Mesh size (mesh)

-100～200

-200～300

-300

Grading ratio (%)

40

40

20

[0047] The raw copper powder is prepared by mixing the copper powders of the above particle size grades in proportion.

[0048] 1.2 Mixing of raw material powder:

[0049] The raw material copper powder is mixed with the raw material tin powder according to the ratio, wherein the weight percentage of the raw material copper powder and the raw material tin powder is: raw material copper powder 90.5wt%; raw material tin powder 9.5wt%.

[0050]1.3 The copper-tin mixed powder was sintered at a temperature of 480° C. for 20 minutes, and then the weight percentage of copper-tin alloy in the ...

Embodiment 2

[0059] 2.1 Classification of electrolytic copper powder: classify electrolytic copper powder, divide electrolytic copper powder into 3 grades, and mix according to the percentage in the following table:

[0060] Types of electrolytic copper powder

1

2

3

Mesh size (mesh)

-100～200

-200～300

-300

Grading ratio (%)

35

35

30

[0061] The use of copper powder with the above particle size grades mixed in proportion can increase the shrinkage rate in subsequent processing; the mold can be reused; the strength can be greatly improved; at the same time, the deformation of the sintered body is relatively large, and the precision requirements are high.

[0062] 2.2 Mixing of raw material powder:

[0063] The above mixed raw copper powder is mixed with the raw tin powder according to the ratio, wherein the weight percentages of the mixed raw copper powder and the raw tin powder are: the mixed raw copper powder 91.5wt...

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Abstract

The invention relates to the fields of new special alloy and power metallurgy materials, in particular to a copper-tin localized alloying powder for an oil-retaining bearing and a preparation method thereof. The copper-tin localized alloying powder for an oil-retaining bearing contains the following components in proportion: 89.5-91.5 wt% of Cu and 8.5-10.5 wt% of Sn. The copper-tin localized alloying powder for an oil-retaining bearing can be used for preparing alloying powders with various specifications according to the actual application requirement by combining raw hopper powders according to the grades of granularities thereof; meanwhile, controllable contractibility rate within a certain range, adjustable apparent density and favorable flowability are realized through adjustment and combination of granularity and control on raw material density and sintering temperature, and relatively ideal contractibility rate of sintering bodies and favorable pressing strength can be obtained in the subsequent treatment process.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a partial copper-tin alloy powder for oil-impregnated bearings and a preparation method thereof. Background technique [0002] Micro motor oil bearing (abbreviation: oil bearing) is a kind of sliding bearing, which is a kind of porous alloy product impregnated with lubricating oil in the pores. When the shaft rotates, due to the friction between the shaft and the oil-impregnated bearing, the temperature of the oil-impregnated bearing increases and the pumping action causes the lubricating oil to seep out of the friction surface of the inner or outer diameter of the oil-impregnated bearing. When the shaft stops when turning. The lubricating oil flows back into the oil bearing. Therefore, the consumption of lubricating oil is very small, and it can be used for a long time without supplying lubricating oil from the outside. It is very suitable for occasions wher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/02C22C1/04F16C33/66
Inventor 苏兆祥谭成波
Owner SHANGHAI QIAODUN METAL