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Iron-based parts and method for manufacture thereof

A manufacturing method and component technology, applied in the field of surface modification technology, can solve problems such as nickel plating peeling, and achieve improved hardness and strength, excellent sliding running-in and corrosion resistance, excellent sliding running-in and wear resistance. The effect of resistance and corrosion resistance

Inactive Publication Date: 2006-05-31
YOSHINO HARD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In this way, although the technologies described in the above two patent documents are excellent in corrosion resistance and running-in performance, the hardness change from the surface of the coating to the depth of the member to be plated is not implemented because the hardness change from the alloy steel to the nickel coating is smooth, etc. The special treatment of the change, so there is a problem that the nickel coating is easy to peel off from the alloy steel

Method used

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  • Iron-based parts and method for manufacture thereof
  • Iron-based parts and method for manufacture thereof
  • Iron-based parts and method for manufacture thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、2

[0062] Mix atomized iron powder (Atmel 300M: manufactured by Kobe Steel Works), electrolytic copper powder (CE15: manufactured by Fukuda Metal Foil Powder Industry), graphite powder (manufactured by Suusu Eastan) and lubricant (zinc stearate ), compress the mixed powder in a metal mold, and sinter in butane-modified gas at a temperature of 1120°C. In addition, the composition of the sintered body was copper: 1.5% by mass, the amount of bonded carbon: 0.2% by mass, and the density was 6.7Mg / m 3 .

[0063] A sample (Example 1) and a sample (Example 2) in which electroless nickel plating was performed on the sintered body were prepared. Here, the plating thickness was set at 5 μm. In addition, the phosphorus content in the electroless nickel plating layer is set to a low concentration. Under such conditions, each sample was sequentially subjected to quenching and tempering treatments. Quenching was carried out by oil quenching after heating at a temperature of 850° C. for 2 h...

Embodiment 3、4

[0065] The base material was produced using the same raw material powder and manufacturing method as in the above-mentioned Examples 1 and 2, except that the bonded carbon content of the sintered body was 0.6% by mass. A sample (Example 3) and a sample (Example 4) in which electroless nickel plating was performed on the sintered body were prepared. Oil quenching and tempering treatments were carried out after heating at a temperature of 880° C. for 1 hour in a gas atmosphere with a carbon potential of 0.1%, respectively.

Embodiment 5

[0067]The base material was produced by the same manufacturing method as in Examples 3 and 4 above, and the bonded carbon content of the sintered body was 0.6% by mass. The sintered body was electroplated with nickel in the same manner as in the above examples, and then heated at a temperature of 850° C. for 2 hours in a gas atmosphere with a carbon potential of 0.6%, quenched and tempered, and a sample was produced.

[0068] Table 1 shows the cross-sectional hardness for Examples 1-5 produced as described above.

[0069] Table 1

[0070] Distance from surface(mm)

0.1

0.3

0.5

1.0

Example 1

770

765

730

675

Example 2

765

725

700

655

Example 3

580

600

630

660

Example 4

600

620

640

665

Example 5

740

725

700

670

[0071] According to Table 1, Example 1 and Example 2, the surface layer port...

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Abstract

The present invention relates to an iron-based component whose hardness in the vicinity of the surface is particularly well adjusted in addition to excellent sliding performance and corrosion resistance. The surface of the iron or iron-based alloy is coated with a nickel layer containing carbon or a nickel layer containing carbon and phosphorus. On the iron or iron-based alloy substrate, a nickel diffusion layer with reduced nickel content is formed toward the depth thereof, and the nickel diffusion layer At least the surface layer contains carbon.

Description

technical field [0001] The present invention relates to iron-based parts used as various machine elements or mechanism parts including iron or iron-based alloys and a method for manufacturing the same, and particularly relates to iron-based parts that are not only slippery (najimi) and corrosion resistance but also A surface modification technology that finely adjusts the hardness near the surface. Background technique [0002] Gears, cams, link arms and other mechanical components, cameras, office equipment, transportation equipment, water treatment equipment and other mechanical components made of iron or iron-based alloys, except that they can be made from close to pure iron to contain other elements such as carbon according to the use Various compositions can be selected, and it can be produced by forming and sintering a mixture of metal powder or other additive powders (hereinafter referred to as "sintered material") in addition to materials made of molten metal (herein...

Claims

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Application Information

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IPC IPC(8): C23C12/02C21D1/06C22C19/03
CPCC23C12/02C21D1/06
Inventor 今井彰男山西祐司筒井唯之石井启
Owner YOSHINO HARD
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