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Surface coating technique of powder metallurgical parts

A powder metallurgy and surface coating technology, used in the fields of low friction coefficient surface treatment, wear resistance and corrosion resistance, can solve the problem of poor anti-corrosion performance, reduce the number of coating times, reduce costs, and achieve excellent rigidity. Effect

Inactive Publication Date: 2013-01-09
WUXI HUAYUE OPTICAL MIRROR BOX CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent forms a dense oxide film on the surface of powder metallurgy parts, the anti-corrosion performance is not very good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A coating process on the surface of a powder metallurgy magnetic material, said method comprising the steps of:

[0033] (1) Perform gas nitriding sulfur chromium treatment on powder metallurgy parts; that is, use a gaseous mixture of sulfur-containing chromium complexes and ammonia gas in a salt bath furnace for treatment at a treatment temperature of 480 ° C for 80 minutes.

[0034] (2) Use a polishing wheel with a brass wire with a wire diameter of 0.15 mm to polish the powder metallurgy parts after step (1);

[0035] (3) Oxidize the powder metallurgy parts processed in step (2) at an oxidation temperature of 300°C for 60 minutes;

[0036] Repeat steps (1)-(3) 2 times;

[0037] (4) Coat the powder metallurgy parts treated in step (3) with Dacromet coating once.

Embodiment 2

[0039] A coating process on the surface of a powder metallurgy magnetic material, said method comprising the steps of:

[0040](1) Perform gas nitriding sulfur chromium treatment on powder metallurgy parts; that is, use a gaseous mixture of sulfur-containing chromium complexes and ammonia gas in a salt bath furnace for treatment at a treatment temperature of 650 ° C for 30 minutes.

[0041] (2) Use a polishing wheel with a brass wire with a wire diameter of 0.05mm to polish the powder metallurgy parts after step (1);

[0042] (3) Oxidize the powder metallurgy parts processed in step (2), the oxidation temperature is 400°C, and oxidize for 10 minutes;

[0043] Repeat steps (1)-(3) 3 times;

[0044] (4) Coat the powder metallurgy parts treated in step (3) with Dacromet coating once.

Embodiment 3

[0046] A coating process on the surface of a powder metallurgy magnetic material, said method comprising the steps of:

[0047] (1) Perform gas nitriding sulfur chromium treatment on powder metallurgy parts; that is, use a gaseous mixture of sulfur-containing chromium complexes and ammonia gas in a salt bath furnace for treatment at a treatment temperature of 480 ° C for 80 minutes.

[0048] (2) Use a polishing wheel with a brass wire with a wire diameter of 0.11mm to polish the powder metallurgy parts after step (1);

[0049] (3) Oxidize the powder metallurgy parts processed in step (2) at an oxidation temperature of 330°C for 30 minutes;

[0050] Repeat steps (1)-(3) 4 times;

[0051] (4) Coat the powder metallurgy parts treated in step (3) with Dacromet coating once.

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Abstract

The invention provides a surface coating technique of powder metallurgical parts, wherein the method comprises the following steps of: (1) performing gas nitriding, sulfurizing and chromizing treatment on the powder metallurgical parts; (2) polishing the powder metallurgical parts treated in step (1); (3) oxidizing the powder metallurgical parts treated in the step (2); and (4) coating dopes on the powder metallurgical parts treated in the step (3). The surface coating technique provided by the invention reduces the coating times of Dacromet dopes, and the dopes are coated once to achieve a corrosion prevention effect, so that the cost is reduced, and meanwhile, the powder metallurgical parts have excellent rigidity.

Description

technical field [0001] The invention relates to surface treatment of powder metallurgy materials, in particular 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 (P / M, Powder Metallurgy) is a process technology for producing metal or using metal powder (or a mixture of metal powder and non-metal powder) as raw material, forming and sintering, and manufacturing metal materials, composites and various types of products , is an important material preparation and forming technology, and is known as the key to solving high-tech and new material problems. 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 pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/24C23C12/02B05D3/12B05D7/14
Inventor 周叶
Owner WUXI HUAYUE OPTICAL MIRROR BOX CO LTD
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