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Preparation method of CuSn10 powder with low bulk density

A low bulk and density technology, applied in the field of powder metallurgy, can solve the problems of difficult control of sintering size change rate, unsatisfactory flow rate and bulk ratio performance, uneven powder composition, etc., to achieve good compressibility, stable shrinkage rate, flow good sex effect

Pending Publication Date: 2020-06-26
杭州屹通新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above-mentioned methods have solved the problem of high loose ratio of powder to varying degrees, there is still a large gap in porosity, which is specifically reflected in the uneven powder composition and difficult control of the sintering size change rate.
In order to solve the above problems, in the disclosed technology, the invention patent ZL03137901.X, a mixed copper-tin 10 powder and its production method, is produced by mixing copper powder, tin powder, copper-tin 10 pre-alloyed powder and additives produced by the pre-alloying method. The ratio of copper powder and tin powder is 9:1. Since the pre-alloyed powder is added to the mixture of copper powder and tin powder, the physical properties of the original mixture of pure copper powder and tin powder are changed. This is also the first method of using copper powder and tin powder. The product prepared by mechanical mixing of tin powder tries to combine the good compressibility of the mixed powder and the uniform composition of the pre-alloyed powder. At the same time, it is also affected by the segregation of the mixed powder components, and its flow rate and loose ratio performance are not ideal

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  • Preparation method of CuSn10 powder with low bulk density
  • Preparation method of CuSn10 powder with low bulk density

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: a kind of preparation method of CuSn10 powder with low bulk density mainly includes the following contents:

[0022] (1) The pure copper powder prepared by the water atomization method is selected, and the particle size of the water atomized pure copper powder is -200 mesh.

[0023] (2) The copper-tin alloy powder prepared by the water atomization method is selected, the particle size is -200 mesh, and the tin content is 20%.

[0024] (3) The above-mentioned pure copper powder and copper-tin alloy powder are selected and mixed in a ratio of 1:1. In order to prevent segregation, 0.2% adhesive is added during the powder mixing process. The ingredients of the adhesive are: thermoplastic 0.03% styrene-butadiene rubber, 3% ethyl acetate, 96.7% alcohol.

[0025] (4) Put the mixed powder into the reduction furnace, and carry out sintering and granulation at the reduction temperature of 500°C.

[0026] (5) The sintered powder is crushed and screened, and the fin...

Embodiment 2

[0027] Embodiment two: a kind of preparation method of low bulk density CuSn10 powder mainly comprises the following contents:

[0028] (1) The pure copper powder prepared by the water atomization method is selected, and the particle size of the water atomized pure copper powder is -200 mesh.

[0029] (2) The copper-tin alloy powder prepared by the water atomization method is selected, the particle size is -200 mesh, and the tin content is 30%.

[0030] (3) The above-mentioned pure copper powder and copper-tin alloy powder are selected and mixed in a ratio of 2:1. In order to prevent segregation, 0.2% adhesive is added during the powder mixing process. The components of the adhesive are: thermoplastic 0.03% styrene-butadiene rubber, 3% ethyl acetate, 96.7% alcohol.

[0031] (4) Put the mixed powder into the reduction furnace for sintering and granulation: the reduction temperature is 700°C.

[0032] (5) The sintered powder is crushed and screened, and the finished powder is ...

Embodiment 3

[0033] Embodiment three: a kind of preparation method of low bulk density CuSn10 powder mainly comprises the following contents:

[0034] (1) The pure copper powder prepared by the water atomization method is selected, and the particle size of the water atomized pure copper powder is -200 mesh.

[0035] (2) The copper-tin alloy powder prepared by the water atomization method is selected, the particle size is -200 mesh, and the tin content is 15%.

[0036] (3) Use the above-mentioned pure copper powder and copper-tin alloy powder to mix uniformly in a ratio of 1:2. In order to prevent segregation, add 0.2% adhesive during the powder mixing process. The mass fraction ratio of the adhesive is: : Thermoplastic styrene-butadiene rubber 0.03%, ethyl acetate 3%, alcohol 96.7%.

[0037] (4) Put the mixed powder into the reduction furnace for sintering and granulation: the reduction temperature is 600°C.

[0038] (5) Crushing and sieving the sintered powder, and adjusting the particl...

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Abstract

The invention discloses a preparation method of CuSn10 powder with low bulk density. The method is characterized by comprising the following steps: selecting pure copper powder prepared by a water atomization method, wherein the granularity of the water atomization pure copper powder is -200 meshes; selecting copper-tin alloy powder prepared by a water atomization method, wherein the granularity of the copper-tin alloy powder is -200 meshes, and the tin content is greater than 10-30%; mixing the pure copper powder and the copper-tin alloy powder according to a proportion, wherein the proportion of the copper to the copper-tin alloy powder is selected to be larger than 0-2.0 times according to the tin content of the copper-tin alloy powder; putting the mixed powder into a reduction furnaceat a reduction temperature of 400-700 DEG C; and crushing and screening the sintered powder, and adjusting the particle size distribution to obtain finished powder. The formed product is stable in performance and good in compressibility and flowability, a pressed green part is high in strength, the shrinkage rate of the powder after sintering is stable, and the structure is fine and uniform.

Description

technical field [0001] The invention relates to powder metallurgy technology, in particular to a method for preparing CuSn10 powder with low bulk density. Background technique [0002] Copper-tin alloy powder is mainly used in oil-impregnated bearings, diamond tools and other industries, among which CuSn10 powder has better pressing and sintering performance as the basic raw material for oil-impregnated bearings. There are currently several methods for preparing CuSn10 powder. One is to mechanically mix copper powder and tin powder at a ratio of 90:10. The other is to partially alloy copper powder and tin powder by diffusion alloying. The third method is to use pre-alloyed water Preparation of copper tin powder by atomization method. Although the above-mentioned methods have solved the problem of high porosity ratio of the powder to varying degrees, there is still a large gap in the porosity, which is specifically reflected in the uneven composition of the powder and the di...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/08B22F9/04
CPCB22F1/0003B22F9/082B22F9/04B22F2009/0828B22F1/103B22F1/10B22F1/142
Inventor 郑卓叶汉龙蒋守高李朋欢汪志荣
Owner 杭州屹通新材料股份有限公司
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