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Preparation method of low-apparent-density copper tin alloy powder for micro oil-retaining bearing

A technology of copper-tin alloy and low porosity ratio, which is applied in the field of preparation of copper-tin alloy powder with low porosity ratio for miniature oil-impregnated bearings, can solve the problems of difficult micro-oil-impregnated bearing sintered products, uneven distribution of alloy elements, and poor powder formability Achieve low cost, improve pressing and sintering performance, and reduce equipment investment

Inactive Publication Date: 2012-07-04
有研科技集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the vibration during transportation and the vibration during automatic powder filling from the powder hopper to the mold will cause local segregation of the original powder in the mixed powder, resulting in uneven distribution of alloying elements in the sintered product
[0004] The two elements of copper and tin in the atomized copper-tin alloy powder are evenly distributed without segregation, but the powder is mostly spherical and has a high bulk density, which leads to poor powder formability and low green compact strength, making it difficult to manufacture miniature oil-impregnated bearing sintered products
[0005] At present, the raw material powder used by manufacturers of miniature oil-impregnated bearings at home and abroad is generally partially alloyed copper-tin powder. This powder successfully solves the problems of the above two powders, but the production process is complicated and the powder cost is high.

Method used

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  • Preparation method of low-apparent-density copper tin alloy powder for micro oil-retaining bearing
  • Preparation method of low-apparent-density copper tin alloy powder for micro oil-retaining bearing

Examples

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Embodiment 1

[0020] A method for preparing copper-tin alloy powder with low porosity ratio for miniature oil-impregnated bearings. The weight percentage of the copper-tin alloy powder is: Cu: 90%, Sn: 10%. The steps of the method are as follows:

[0021] (1) Atomized powder making process: After mixing the electrolytic copper plate and tin material according to the weight ratio of 9:1, after heating to a molten state, copper-tin alloy powder particles are obtained through water atomized powder making equipment;

[0022] (2) Oxidation powder process: dynamically oxidize the alloy powder in a rotary kiln at 450°C, and the oxidation time is 60 minutes;

[0023] (3) Powder reduction process: the oxidized copper-tin alloy powder is reduced in a chain reduction furnace, and the protective atmosphere used for the reduction is an ammonia decomposition atmosphere (N 2 :H 2 =1:3), the reduction temperature is 550°C, and the reduction time is 45min;

[0024] (4) Sieve the reduced powder particles a...

Embodiment 2

[0029] Except that the weight percent of the copper-tin alloy powder composition phase is: Cu: 65%, Sn: 35%, and the electrolytic copper plate and the tin material are mixed according to the weight ratio of 65:35, the rest are the same as in Example 1, and the copper-tin obtained in this example The bulk density of the alloy powder is 2.8g / cm 3 about.

Embodiment 3

[0031] Except that the weight percent of the copper-tin alloy powder composition phase is: Cu: 95%, Sn: 5%, and the electrolytic copper plate and the tin material are mixed according to the weight ratio of 95:5, the rest are the same as in Example 1, and the copper obtained in this example The bulk density of tin alloy powder is 2.2g / cm 3 about.

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Abstract

The invention discloses a preparation method of low-apparent-density copper tin alloy powder for a micro oil-retaining bearing, and belongs to the technical field of copper tin alloy powder for the micro oil-retaining bearing. The alloy powder comprises the following component phases in percentage by weight: 65-95 percent of Cu and 5-35 percent of Sn. The preparation method comprises the following steps of: after atomized pulverizing of the copper tin alloy, dynamically oxidizing the prepared alloy powder; and then obtaining the alloy powder with proper apparent density by using a high-temperature hydrogen reduction technology. The method has a simple flow, low equipment investment and high technical content; the copper tin alloy powder is not mechanically mixed so as to easily cause the phenomenon of segregation during use and storage; meanwhile, the specific surface area of the powder is increased; and the press sintering performance of the powder is improved. The prepared alloy powder is particularly suitable for producing the micro oil-retaining bearing.

Description

technical field [0001] The invention belongs to the technical field of preparing copper-tin alloy powder for miniature oil-impregnated bearings, in particular to a method for preparing copper-tin alloy powder with low bulk ratio for miniature oil-impregnated bearings. Background technique [0002] Copper-tin miniature oil-impregnated bearings have the advantages of strong corrosion resistance, high mechanical strength, high thermal conductivity, and long service life. They are widely used in precision electronics, high-end household appliances, communication facilities, automobiles, and IT. A class of essential basic parts. Since the raw material copper tin powder has a great influence on the final performance of miniature oil-impregnated bearings, the research on the raw material powder and how to improve the powder performance have always been paid attention to by people. [0003] When directly mixing copper powder and tin powder to manufacture sintered oil-impregnated be...

Claims

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Application Information

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IPC IPC(8): C22C9/02C22C1/04B22F9/08
Inventor 董小江汪礼敏张景怀王林山刘宇慧徐景杰穆艳如
Owner 有研科技集团有限公司
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