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Preparation method of copper-tin local alloy powder for oil-containing bearing

A technology of alloy powder and mixed powder, which is applied in the field of preparation of copper-tin local alloy powder, which can solve the problems of large density difference between tin powder and copper powder, low strength of oil-bearing bearings, uniform diffusion of tin powder, etc., and achieve improved porosity , good density uniformity, low particle density effect

Inactive Publication Date: 2019-02-26
罗源县凤山镇企业服务中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the density difference between tin powder and copper powder is large, and segregation is prone to occur after mixing. It is difficult to make the tin powder diffuse evenly in the copper powder by mixing, so the strength of the oil-impregnated bearing is not high, and the traditional copper powder is used It is difficult to prepare high porosity oil-impregnated bearings with tin partial alloy powder

Method used

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  • Preparation method of copper-tin local alloy powder for oil-containing bearing
  • Preparation method of copper-tin local alloy powder for oil-containing bearing

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preparation example Construction

[0013] Please refer to figure 1 Shown, a kind of preparation method of the copper-tin local alloy powder that the invention provides for oil bearing, comprises the following steps:

[0014] S1, oxidizing the copper powder to obtain copper oxide powder, and then reducing the copper oxide powder to obtain porous copper powder;

[0015] S2. Mix the porous copper powder and tin powder to obtain a mixed powder with a tin content of 9.5wt% to 10.5wt%, and heat the mixed powder at a temperature of 450°C to 650°C for 5min to 8min;

[0016] S3. Crushing the heated mixed powder, and then adding 0.2wt% to 0.4wt% of paraffin wax powder to the crushed mixed powder.

[0017] It can be seen from the above description that after the copper powder is first oxidized and then reduced, a porous copper powder with a rough surface and pores can be obtained. The rough surface of the porous copper powder can increase the friction between the porous copper powder and the tin powder. Segregation betw...

Embodiment 1

[0043] Please refer to figure 1 Shown, embodiment one of the present invention is:

[0044] A method for preparing copper-tin partial alloy powder for oil bearings, comprising the following steps:

[0045] S1, oxidizing the copper powder to obtain copper oxide powder, and then reducing the copper oxide powder to obtain porous copper powder;

[0046] S2. Mix the porous copper powder and tin powder to obtain a mixed powder with a tin content of 9.5 wt%, and heat the mixed powder at a temperature of 650° C. for 5 minutes;

[0047] S301, breaking the heated mixed powder;

[0048] S302. Sieve the crushed mixed powder to obtain a sieved powder with a particle size ranging from 60 mesh to 500 mesh;

[0049] S303. Add 0.4 wt% paraffin wax powder to the sieved powder.

Embodiment 2

[0051] A method for preparing copper-tin partial alloy powder for oil bearings, comprising the following steps:

[0052] S1, oxidizing the copper powder to obtain copper oxide powder, and then reducing the copper oxide powder to obtain porous copper powder;

[0053] S2. Mix the porous copper powder and tin powder to obtain a mixed powder with a tin content of 10 wt%, and heat the mixed powder at a temperature of 500° C. for 7 minutes;

[0054] S301, breaking the heated mixed powder;

[0055] S302. Sieve the crushed mixed powder to obtain a sieved powder with a particle size ranging from 60 mesh to 500 mesh;

[0056] S303. Add 0.3 wt% paraffin wax powder to the sieved powder.

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Abstract

The invention relates to a preparation method of copper-tin local alloy powder for an oil-containing bearing. The method includes the following steps that S1, oxidation is carried out on copper powderto obtain copper oxide powder, and then reduction treatment is carried out on the copper oxide powder to obtain porous copper powder; S2, the porous copper powder is mixed with tin powder to obtain the mixed powder with the tin content of 9.5-10.5%, and the mixed powder is heated at the temperature of 450-650 DEG C for 5-8 minutes; S3, the heated mixed powder is crushed, and then 0.2-0.4% of paraffin powder is added into the crushed mixed powder. The copper-tin local alloy powder uniform in tin distribution can be obtained, and meanwhile, the prepared oil-containing bearing has high porosity.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a method for preparing copper-tin partial alloy powder used for oil-impregnated bearings. Background technique [0002] Semi-diffused copper-tin alloy powder is a kind of copper-tin alloy powder. Its preparation method is usually to mix copper powder and tin powder and then heat, so that the tin part diffuses in the copper powder to achieve the effect of partial alloying. However, the density difference between tin powder and copper powder is large, and segregation is prone to occur after mixing. It is difficult to make the tin powder diffuse evenly in the copper powder by mixing, so the strength of the oil-impregnated bearing is not high, and the traditional copper powder is used It is difficult to prepare oil-impregnated bearings with high porosity with tin partial alloy powder. Contents of the invention [0003] The technical problem to be solved by the present in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00
CPCB22F1/102B22F1/145
Inventor 林怡满
Owner 罗源县凤山镇企业服务中心
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