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Preparation method for tin-coated copper composite powder

A composite powder and mixed powder technology, applied in the field of powder metallurgy, can solve the problems of high powder hardness, increased pressure and mold wear, powder performance influence, etc. Effect

Inactive Publication Date: 2013-03-20
JIANGSU YINGQIU GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is currently the most widely used, but the prepared pre-alloyed powder needs to be crushed, which has a great influence on the powder performance, and the prepared pre-alloyed powder forms a copper-tin solid solution, so the powder hardness is higher than that of the mixed powder, which increases the pressure during the pressing process. pressure and die wear

Method used

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  • Preparation method for tin-coated copper composite powder
  • Preparation method for tin-coated copper composite powder
  • Preparation method for tin-coated copper composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of tin-coated copper composite powder, the steps are as follows:

[0029] (1) Prepare powder, weigh a certain mass of copper powder and tin powder, and manually stir and pre-mix. Among them, the content of tin powder is 10%, the balance is copper powder, 0.5% of stearic acid is added, and stearic acid is added to play a lubricating effect. Copper powder is atomized copper powder, the particle size of copper powder is larger, and the particle size of tin powder is smaller. The particle size of the copper powder is -100 mesh, and the particle size of the tin powder is -300 mesh.

[0030] (2) Pretreatment, put the copper and tin powder weighed in step (1) into a ball mill for ball milling, and use a planetary ball mill to dry in a vacuum drying oven at 65°C for 4 hours to prepare a 'flaky' Copper-tin mixed powder, stainless steel balls are used as grinding balls, absolute ethanol is used as grinding medium, the mass ratio of grinding balls to raw mat...

Embodiment 2

[0034] (1) Prepare powder, weigh a certain mass of copper powder and tin powder, and manually stir and pre-mix. The content of tin powder is 12%, the balance is copper powder, and 0.5% stearic acid is added. Copper powder is electrolytic copper powder, the particle size of copper powder is larger, and the particle size of tin powder is smaller. The particle size of the copper powder is -100 mesh, and the particle size of the tin powder is -300 mesh.

[0035] (2) Pretreatment, put the copper and tin powder weighed in step (1) into a ball mill for ball milling, and use a rolling ball mill to dry in a vacuum drying oven at 65°C for 4 hours to prepare 'flaky' copper The tin mixed powder uses stainless steel balls as grinding balls, absolute ethanol as the grinding medium, the mass ratio of grinding balls to raw material powder is 5:1, and the ball milling time is 10 minutes. ;

[0036] (3) Annealing, put the powder pretreated in step (2) into a tube furnace, and anneal at 220°C...

Embodiment 3

[0039] (1) Prepare powder, weigh a certain mass of copper powder and tin powder, and manually stir and pre-mix. The content of tin powder is 8%, the balance is copper powder, and 0.5% stearic acid is added.

[0040] (2) Pretreatment, put the copper and tin powder weighed in step (1) into a ball mill for ball milling, and use a high-energy ball mill to dry in a vacuum oven at 65°C for 4 hours to prepare 'flaky' copper The tin mixed powder uses stainless steel balls as grinding balls, absolute ethanol as the grinding medium, the mass ratio of grinding balls to raw material powder is 4:1, and the ball milling time is 20 minutes. ;

[0041] (3) Annealing, put the powder pretreated in step (2) into a tube furnace, and anneal at 180°C for 90 minutes in a hydrogen atmosphere;

[0042] (4) Shaping treatment, move the powder in step (3) into the spheroidizing equipment, the rotating speed is 3600r / min, the processing time is 15min, and the tin-clad copper composite powder is prepared...

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Abstract

The invention relates to a preparation method for tin-coated copper composite powder. The composite powder comprises primary particles and secondary particles, wherein the primary particles mainly comprise copper powder; and the secondary particles mainly comprise small particle tin powder. The preparation method comprises the steps as follows: weighing a certain amount of the copper powder and the tin powder respectively; placing the weighed powder in a ball mill, and preprocessing for a period of time to prepare sheet powder; annealing the preprocessed powder under a protective atmosphere; and adding the annealed powder into spheroidizing equipment, and compounding and spheroidizing to prepare the tin-coated copper composite powder. According to the tin-coated copper composite powder, the copper powder can be uniformly coated with tin, the particle size of the powder is uniform, and the flowability is good. The preparation process is simple, the cost is lower, and the prepared oil bearing powder is good in flowability and easy to press.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a preparation method of tin-clad copper composite powder. Background technique [0002] Tin bronze oil bearing has the advantages of strong corrosion resistance, high mechanical strength, high thermal conductivity, long working life, etc. It is widely used in precision electronics, high-end household appliances, communication equipment, automobiles and IT and other fields. Copper tin powder is mainly mixed powder, fully alloyed powder and partially alloyed powder. [0003] The mixing method is to directly mix copper powder and tin powder according to a certain mass ratio, and then put them into the mixer for a certain period of time to obtain mixed copper-tin powder. This process is simple in operation and high in production efficiency, but due to The difference in raw material density, particle size and shape, although it has been mixed evenly by the powder mixer, due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02
Inventor 申承秀
Owner JIANGSU YINGQIU GRP CO LTD
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