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Surface treatment method of powder metallurgy part

A powder metallurgy and surface treatment technology, applied in metal material coating process, coating, solid diffusion coating and other directions, to achieve the effect of reducing production cost, improving corrosion resistance and stable quality

Inactive Publication Date: 2011-07-06
杭州力合金邦表面技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing technology, almost no one performs surface treatment on powder metallurgy to improve its surface properties and achieve the effect of traditional steel QPQ

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The composition and weight content of the powder metallurgy material in this example are: 0.95-1.05% C, 1.5-2% Cu, and the rest are Fe and unavoidable impurities. Its material can be made by existing powder metallurgy technology, and the product density is 6.7g / cm 3 , carry out the surface treatment of the present invention on this powder metallurgy part.

[0021] Degreasing and decontamination treatment uses RR-60 high-efficiency cleaning agent, at 25-40 ° C, ultrasonic cleaning for 3-15 minutes; pickling activation treatment uses RR-602 activator, 25-40 ° C, ultrasonic cleaning for 5-10 minutes; water washing is at room temperature Deionized water; then put in an infrared oven at a temperature of 220-340°C for 1 hour. Then carry out gas nitriding sulfur chromium, the temperature is 560 ℃, the time is 50min; the shot peening treatment is carried out after cooling out of the furnace; the final oxidation treatment temperature is 350 ℃, the treatment time is 120min; afte...

Embodiment 2

[0023]The composition and weight content of the powder metallurgy material in this example are: 0.95-1.05% C, 1.5-2% Cu, 3.5-5% Ni, and the rest are Fe and unavoidable impurities. Its material can be made by existing powder metallurgy technology, and the product density is 6.9g / cm 3 , carry out the surface treatment of the present invention on this powder metallurgy part.

[0024] Degreasing and decontamination treatment uses RR-60 high-efficiency cleaning agent, at 25-40 ° C, ultrasonic cleaning for 3-15 minutes; pickling activation treatment uses RR-602 activator, 25-40 ° C, ultrasonic cleaning for 5-10 minutes; water washing is at room temperature Deionized water; then put in an infrared oven at a temperature of 220-340°C for 1 hour. Then carry out gas nitriding of sulfur chromium at 540°C for 120 minutes; after cooling out of the furnace, carry out shot peening; finally carry out oxidation treatment at 350°C for 120 minutes; after the above surface treatment, 40μm The ni...

Embodiment 3

[0026] The composition and weight content of the powder metallurgy material in this example are: 0.95-1.05% C, 1.5-2% Cu, 3.5-5% Ni, 3% Mo, and the rest are Fe and unavoidable impurities. Its material can be made by existing powder metallurgy technology, and the product density is 7.0g / cm 3 , carry out the surface treatment of the present invention on this powder metallurgy part.

[0027] Degreasing and decontamination treatment uses RR-60 high-efficiency cleaning agent, at 25-40 ° C, ultrasonic cleaning for 3-15 minutes; pickling activation treatment uses RR-602 activator, 25-40 ° C, ultrasonic cleaning for 5-10 minutes; water washing is at room temperature Deionized water; then put in an infrared oven at a temperature of 220-340°C for 1 hour. Then carry out gas nitrogen sulfur chromium nitriding, the temperature is 580 ℃, the time is 70min; the shot peening treatment is carried out after cooling out of the furnace; the final oxidation treatment temperature is 350 ℃, the tre...

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Abstract

The invention discloses a surface treatment method of a powder metallurgy part. The method comprises the following steps of: firstly, performing complex cementation on the powder metallurgy part with nitrogen gas, sulfur gas and chromium gas to form a dense coating tissue of a nitrogen-sulfur-chromium compound with the size of between 15 microns and 45 microns on the surface of the powder metallurgy part; secondly, polishing the surface of the powder metallurgy part; and lastly, oxidizing the powder metallurgy part at low temperature to form a dense oxide layer. The compound coating tissue is a dense oxide layer covered by a polynary ultra-hard nitrogen-sulfur-chromium compound, so that the powder metallurgy part has high wear resistance, corrosion resistance and high temperature resistance, the friction coefficient is greatly lowered, the seizing resistance magnitude order is raised, the working quality of the powder metallurgy part is remarkably enhanced, and the service life is prolonged.

Description

technical field [0001] The invention relates to a surface treatment method of wear resistance, corrosion resistance and low friction coefficient on the surface of powder metallurgy parts. Background technique [0002] Powder metallurgy parts refer to metal parts that are directly made of several metal powders or metal powders and non-metallic powders without melting and casting, through preparation, compression molding, sintering, etc. Powder metallurgy is a metallurgical process and ceramic sintering process The perfect combination, when using powder metallurgy to manufacture products, the loss of metal is only 1 to 5%, while when using general casting methods, the loss of metal may reach 80%, powder metallurgy can be pressed into the final size of the compact, It does not require or rarely requires subsequent mechanical processing, so it can greatly save metal, reduce product costs, and be an advanced process for mass production. [0003] In order to further expand the ap...

Claims

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Application Information

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IPC IPC(8): C23C8/28C23C8/02C23C8/80
Inventor 不公告发明人
Owner 杭州力合金邦表面技术有限公司
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