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Chromium-containing copper infiltrant and preparation method thereof

A technology of copper infiltration agent and copper powder, used in metal processing equipment, coating, transportation and packaging, etc., can solve the problems of loose surface of parts, reduce copper and other problems, achieve the effect of equipment operation, good formability, and improve material hardness

Inactive Publication Date: 2020-04-17
WUXI HENGTELI METAL PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the brazing agent, the role of carbon is to reduce the solubility of iron in copper, but at the same time reduce the melting point of copper on the surface of the part. Therefore, in actual production, although the addition of manganese is beneficial to the infiltration of copper during the copper infiltration process, but It is also found that if the permeability of copper is excessively increased and the solubility of iron is reduced, the iron on the surface of the part will continue to dissolve with the infiltrated copper to achieve final saturation during use, resulting in loosening on the surface of the part after a period of use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A chromium-containing brazing agent, its composition includes: 1.3% iron, 0.5% carbon, 0.01% chromium and the balance copper, wherein the iron raw material is reduced iron powder, the carbon raw material is carbon powder, chromium The raw material is chromium powder, and the copper raw material is electrolytic copper powder.

[0020] The electrolytic copper powder has a particle size of less than 100 mesh and a bulk density of 2.0 g / cm3.

[0021] The reduced iron powder has a particle size of less than 150 mesh.

[0022] The carbon powder has a particle size of less than 200 mesh.

[0023] The chromium powder has a particle size of less than 200 mesh.

[0024] A preparation method of chromium-containing brazing agent, the method steps are as follows:

[0025] (1) Weigh electrolytic copper powder: 98.19kg, reduced iron powder: 1.3kg, carbon powder: 0.5kg, chromium powder: 0.01kg, according to the ratio of ball to material 1:20, add 5kg of alumina ceramic balls, add 0....

Embodiment 2

[0029] A chromium-containing copperizing agent, its composition includes: 2.9% iron, 1.7% carbon, 0.2% chromium and the balance of copper, wherein the iron raw material is reduced iron powder, the carbon raw material is carbon powder, chromium The raw material is chromium powder, and the copper raw material is electrolytic copper powder.

[0030] The electrolytic copper powder has a particle size of less than 100 mesh and a bulk density of 2.0 g / cm3.

[0031] The reduced iron powder has a particle size of less than 150 mesh.

[0032] The carbon powder has a particle size of less than 200 mesh.

[0033] The chromium powder has a particle size of less than 200 mesh.

[0034] A preparation method of chromium-containing brazing agent, the method steps are as follows:

[0035] (1) Weigh electrolytic copper powder: 95.2kg, electrolytic iron powder: 2.9kg, carbon powder: 1.7kg, chromium powder: 0.2kg, according to the ball material ratio 1:20, add 5kg zirconia ceramic balls, add 0...

Embodiment 3

[0039] A chromium-containing copperizing agent, its composition includes: 1.8% iron, 1.2% carbon, 0.15% chromium and the balance of copper, wherein the iron raw material is carbonyl iron powder, the carbon raw material is carbon powder, chromium The raw material is chromium powder, and the copper raw material is atomized copper powder.

[0040] The atomized copper powder has a particle size of less than 100 mesh and a bulk density of 2.0 g / cm3.

[0041] The carbonyl iron powder has a particle size of less than 700 mesh.

[0042] The carbon powder has a particle size of less than 200 mesh.

[0043] The chromium powder has a particle size of less than 200 mesh.

[0044] A preparation method of chromium-containing brazing agent, the method steps are as follows:

[0045] (1) Weigh atomized copper powder: 96.85kg, carbonyl iron powder: 1.8kg, carbon powder: 1.2kg, chromium powder: 0.15kg, according to the ratio of ball to material 1:20, add 5kg of stainless steel balls, add 0.25...

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Abstract

The invention belongs to the technical field of powder metallurgy and discloses a chromium-containing copper infiltrant and a preparation method thereof. The copper infiltrant is prepared from the compositions in percentage by mass: 1.3-2.9% of iron, 0.5-1.7% of carbon, 0.01-0.2% of chromium and the balance of copper. The preparation method comprises the steps that raw materials are weighed according to the ratio, ceramic balls or stainless steel balls and a diffusion promoter are added, after mixing, powder is fed into a hydrogen reduction furnace to be diffused, the diffusion temperature is300-1000 DEG C, the diffusion time is 0.5-25 h, cooling, discharging out of the furnace for crushing and screening for collection are conducted, and then a lubricant is added for blending. The copperinfiltrant prepared by the preparation method has the characteristics that formability is good, the infiltration efficiency is high, no erosion exists, residue is less, and the material density and mechanical properties are significant improved. The method is simple in process, required equipment is easy to operate, and mass production can be achieved.

Description

technical field [0001] The invention relates to the field of metallurgical materials, in particular to a chromium-containing copperizing agent and a preparation method thereof. Background technique [0002] At present, due to its low cost and easy processing, powder metallurgy sintered steel parts are more and more widely used in industrial production, especially in the automotive machinery industry. Commonly used sintered steel gears, cams, valve seats, exhaust valve seats, etc. , when these parts are in service in some harsh environments, they are required to have good wear resistance and impact resistance, while maintaining high strength and hardness. However, the powder metallurgy sintered steel parts manufactured by conventional pressing-sintering process cannot reach a complete compact state during the pressing process, and the residual pores as a defect affect its tensile strength, impact toughness, fatigue strength and hardness. And other properties, so that it can ...

Claims

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Application Information

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IPC IPC(8): B22F3/26B22F1/00C23C12/02
CPCB22F3/26C23C12/02B22F2003/242B22F1/10
Inventor 邹勇平吕廷镇
Owner WUXI HENGTELI METAL PROD
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