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Method for producing premixed copper-tin 10 bronze

A production method and pre-mixing technology, applied in the field of powder metallurgy, can solve problems such as high energy consumption, unfavorable sintering of electrolytic copper powder, high pollution, etc., and achieve good pore distribution, avoid component segregation, and high sintering strength.

Active Publication Date: 2016-03-09
湖南省天心博力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of electrolytic copper powder is a high-pollution and high-energy-consuming copper powder production method, and electrolytic copper powder is not conducive to sintering. The dendritic structure of electrolytic copper powder is easy to form closed pores during sintering.

Method used

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  • Method for producing premixed copper-tin 10 bronze

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of raw copper powder: Copper powder is atomized by water with a conical spray plate, with 30 spray holes, the diameter of the spray hole is 1.0mm, the water pressure of the spray plate is 15MPa, the particle size of the copper powder is less than 100μm, and the shape of the copper powder is Irregular in appearance, bulk density is 2.0~2.6g / cm 3 ;The atomized copper powder is heat treated in a heat treatment furnace, the heat treatment temperature is 500°C, the heat treatment atmosphere is reducing atmosphere, and the heat treatment time is 30 minutes; then the powder is crushed and oxidized and sieved, and the antioxidant is selected to passivate the copper powder with a volatilization temperature above 300°C agent, sieve to get raw copper powder less than 150um;

[0024] (2) Mix the raw materials copper powder and tin powder according to the ratio of 9:1, and mix them evenly in the batch machine, and the bulk density of the tin powder is less than 3.5g / ...

Embodiment 2

[0030] (1) Preparation of raw copper powder: Copper powder is atomized by water with a conical spray plate, with 30 spray holes, the diameter of the spray hole is 1.0mm, the water pressure of the spray plate is 15MPa, the particle size of the copper powder is less than 100μm, and the shape of the copper powder is Irregular in appearance, bulk density is 2.0~2.6g / cm 3 ;The atomized copper powder is heat treated in a heat treatment furnace, the heat treatment temperature is 500°C, the heat treatment atmosphere is reducing atmosphere, and the heat treatment time is 30 minutes; then the powder is crushed and oxidized and sieved, and the antioxidant is selected to passivate the copper powder with a volatilization temperature above 300°C agent, and sieve to obtain raw copper powder less than 150 μm;

[0031] (2) Mix raw copper powder and tin powder according to the ratio of 9:1, and mix them evenly in the batch machine. Among them, the bulk density of tin powder is less than 3.5g / c...

Embodiment 3

[0037] (1) Preparation of raw copper powder: Copper powder is atomized by water with a conical spray plate, with 30 spray holes, the diameter of the spray hole is 1.0mm, the water pressure of the spray plate is 15MPa, the particle size of the copper powder is less than 100μm, and the shape of the copper powder is Irregular in appearance, bulk density is 2.0~2.6g / cm 3 ;The atomized copper powder is heat treated in a heat treatment furnace, the heat treatment temperature is 500°C, the heat treatment atmosphere is reducing atmosphere, and the heat treatment time is 30 minutes; then the powder is crushed and oxidized and sieved, and the antioxidant is selected to passivate the copper powder with a volatilization temperature above 300°C agent, and sieve to obtain raw copper powder less than 150 μm;

[0038] (2) Mix raw copper powder and tin powder according to the ratio of 9:1, and mix them evenly in the batch machine. Among them, the bulk density of tin powder is less than 3.5g / c...

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Abstract

The invention discloses a method for producing premixed copper-tin 10 bronze. The method comprises the steps that copper powder is subjected to water atomization by a conical spray tray and then is subjected to thermal treatment, the copper powder subjected to thermal treatment is crushed and subjected to oxidation resistance, and raw material copper powder is obtained through screening; the prepared copper powder and tin powder are evenly mixed according to the mass fraction; the powder is subjected to thermal treatment in a reducing atmosphere, and copper powder particles and tin powder particles are bonded with each other in a diffusion mode in the thermal treatment process; the thermal treatment powder is crushed, and powder is obtained through screening; a lubricating agent is added into the powder to be mixed evenly. According to mixed bronze powder produced by the method, the water atomization copper powder in irregular shapes is used and then is subjected to thermal treatment, so that the raw material copper powder has good toughness, and composition segregation of the bronze powder is avoided; in addition, the water atomization copper powder is likely to form communicated pores after being sintered, and the environment can not be polluted by the water atomization method for producing the bronze powder. The premixed bronze prepared by the method is free of composition segregation, stable in apparent density, good in forming property and high in sintered strength; well distributed pores are formed in a sintered mode.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a production method of premixed copper-tin-10 bronze. Background technique [0002] Copper-tin-bronze self-lubricating bearings have the characteristics of strong corrosion resistance, high strength, low noise and long life, and are now the basic parts in the mechanical field. Copper tin 10 bronze powder is the main raw material for making self-lubricating bearings. Copper tin 10 bronze powder is divided into pre-mixed bronze powder and alloy bronze powder. Mixed bronze powder is to mix copper powder and tin powder according to the ratio of 9:1, so the production method is simple and the production efficiency is high, but the disadvantage of this production method is that the tin powder is easy to segregate, and the segregated parts in the parts sintered with the bronze powder Tin melting is prone to large pores, which affects the pore distribution and sintering strength of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C9/02
CPCC22C9/02B22F1/05B22F1/10B22F1/142
Inventor 莫文剑易翠钟耀宗
Owner 湖南省天心博力科技有限公司
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