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Preparation process of low-content copper-tin alloy powder

A technology for preparing copper-tin alloy and powder, which is applied in the field of preparation technology of low-content copper-tin alloy powder, can solve the problems of unstable content, discounted application effect, low activity, etc., so as to improve dispersibility, inhibit agglomeration and improve dispersibility. Effect

Active Publication Date: 2020-11-06
湖南省天心博力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the copper-tin powder with low tin content (tin content 5% and below) prepared by the traditional high-temperature smelting-atomization process has large tin burning loss, unstable content, large fluctuations, uneven distribution of Sn content, and Sn in the copper matrix. It is in the disadvantages of complete alloying, low activity, low catalytic activity, low temperature sintering and low alloying activity, so its application effect is greatly reduced

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  • Preparation process of low-content copper-tin alloy powder

Examples

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Effect test

Embodiment 1

[0028] A preparation process of low-content copper-tin alloy powder, the specific method is as follows:

[0029] (1) Mixing of copper and tin powder: use accurate weighing technology to weigh 5wt% tin powder with a purity of not less than 99.9%, add it to 95wt% water atomized copper powder with a purity of not less than 99.9% for mixing, and mix evenly ,spare. Among them, the particle size of the tin powder is less than 100 μm, and the particle size of the copper powder is less than 150 μm.

[0030] It is worth noting that the accuracy of the precise weighing technology of tin powder is controlled between 0.145% and 0.155%.

[0031] (2) High-energy ball milling: the above-mentioned uniformly mixed copper-tin powder and stearic acid are added in the high-energy ball mill, and ball milling is carried out at room temperature under the protection of nitrogen or inert gas, wherein the medium is a cast steel ball of db5mm, and the material-ball ratio is 1:25, the filling factor is...

Embodiment 2

[0037] A preparation process of low-content copper-tin alloy powder, the specific method is as follows:

[0038](1) Mixing of copper and tin powder: Weigh 5wt% tin powder with a purity of not less than 99.9% by precise weighing technology, add it to 95wt% water atomized copper powder with a purity of not less than 99.9% for mixing, and then add Polyethylene glycol is added in an amount of 0.4 wt% of the copper-tin alloy powder, mixed evenly, and set aside. Among them, the particle size of the tin powder is less than 100 μm, and the particle size of the copper powder is less than 150 μm. The accuracy of the precise weighing technology of tin powder is controlled between 0.145% and 0.155%.

[0039] (2) High-energy ball milling: its preparation process is the same as step (2) in Example 1, specifically refer to Example 1.

[0040] (3) Airflow classification: its preparation process is the same as step (3) in Example 1, with specific reference to Example 1.

Embodiment 3

[0042] A preparation process of low-content copper-tin alloy powder, the specific method is as follows:

[0043] (1) Mixing of copper and tin powder: Weigh 0.1wt% tin powder with a purity of not less than 99.9% by precise weighing technology, add it to 99.9wt% water atomized copper powder with a purity of not less than 99.9% for mixing, and then Polyethylene glycol was added in an amount of 0.2 wt% of the copper-tin alloy powder, mixed evenly, and set aside. Among them, the particle size of the tin powder is less than 100 μm, and the particle size of the copper powder is less than 150 μm. The accuracy of the precise weighing technology of tin powder is controlled between 0.145% and 0.155%.

[0044] (2) High-energy ball milling: the above-mentioned uniformly mixed copper-tin powder and stearic acid are added to a high-energy ball mill, and ball milling is carried out at room temperature under the protection of nitrogen or an inert gas, wherein the medium is a cast steel ball o...

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Abstract

The invention discloses a preparation process of low-content copper-tin alloy powder, and relates to the technical field of copper-tin alloy powder processing. The disclosed low-content copper-tin alloy powder is prepared by copper-tin powder mixing, high-energy ball milling and airflow classification processes, and the tin-copper alloy powder obtained by the mechanical alloying preparation process has a microstructure in an irregular scaly shape, a larger specific surface area and a more developed surface, and has the advantages of being higher in chemical catalytic activity, higher in low-temperature sintering activity, good in low-temperature alloying effect and the like. The process is simple and easy and convenient to operate; and by adopting the processes of airflow classification, dispersion treatment and the like, the copper-tin alloy powder product has good dispersity, the average grain diameter D50 and grain fineness distribution can be adjusted and controlled according to user requirements, the application performance of the product is greatly improved, and product quality requirements of customers are met.

Description

technical field [0001] The invention belongs to the technical field of copper-tin alloy powder processing, and in particular relates to a preparation process of low-content copper-tin alloy powder. Background technique [0002] As the earliest alloy used by humans, copper-tin alloy has a history of about 4000 years. The smelting and production of copper-tin alloy is easier than pure copper, and its strength is significantly improved compared with pure copper, and its wear resistance and chemical resistance are stable. When the tin content is less than 5%, the α solid solution is mainly formed in the copper-tin alloy, showing excellent plastic properties; when the tin content is close to 7%, the copper-tin alloy appears as Cu 31 sn 8 Based on the solid solution, the plastic deformation ability is reduced, and in high temperature environment, Cu 31 sn 8 The solid solution based on copper decomposes and diffuses, recrystallizes, and has good hot workability; when the tin co...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F1/00
CPCB22F1/0003B22F9/04B22F2009/042B22F2009/043
Inventor 李钢黄雄辉张拥军杨丛红
Owner 湖南省天心博力科技有限公司
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