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Iron based powder for powder metallurgy

An iron-based powder and powder metallurgy technology, which is applied in metal processing equipment, thin material handling, transportation and packaging, etc., can solve the problems of uniform and sufficient filling of iron-based powder and reduction of the yield of iron powder.

Active Publication Date: 2010-11-24
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this technique, since iron powder deviated from the specified range cannot be used, not only the yield of iron powder is lowered, but also it is difficult to uniformly and sufficiently fill a thin-walled cavity such as a gear tooth with iron-based powder.

Method used

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  • Iron based powder for powder metallurgy
  • Iron based powder for powder metallurgy
  • Iron based powder for powder metallurgy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Each binder shown in Table 1 and iron powder, graphite powder, Cu powder, etc. shown in Table 1 were heated and mixed using a Henschel type high-speed mixer, and cooled to 60°C. Then, various fluidity-improving particles and favorable lubricants shown in Table 2 and Table 1 were added and mixed. In addition, the physical properties of the fluidity-improving particles are shown in Table 3. In addition, some samples (No. 12, No. 13) used iron powder previously subjected to an overwetting improvement treatment with a silane coupling agent (phenyltrimethoxysilane) under the above-mentioned preferred conditions.

[0091] The surface of each of the obtained iron-based powders was observed using a scanning electron microscope (SEM), and the adhesion state of the fluidity-improving particles was evaluated. Examples of photographs taken of the iron-based powder surface are shown in Figure 2A ~ Figure 2C , and show the results of its evaluation together. Figure 2A ○ (良: Good...

Embodiment 2

[0116] Using a Henschel type high-speed mixer, heat and mix the binders shown in Table 4 and iron powder, graphite powder, Cu powder, etc. shown in Table 4, and cool to 60°C, and then put the Iron powder to which no binder was attached, free lubricant and fluidity-improving particles shown in Table 5. In No.31~33 and No.36~40, fluidity improving particles are pre-mixed with iron powder without binder, and then mixed with iron powder with binder attached (the above heating, mixing and cooling to 60 ℃ iron powder) mixing; in No.34 and No.35, the fluidity-improving particles and the iron powder without the binder were not previously mixed, but were mixed with the iron powder with the binder attached. In No. 40, the iron powder to which the binder was added was subjected to a wettability improvement treatment in the same manner as in Example 1.

[0117]Then, it examined similarly to Example 1. The results are shown in Table 5. In addition, all the determinations of the state of...

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Abstract

An iron based powder for powder metallurgy that can be molded while ensuring high fluidity, uniform filling in thin cavity and high withdrawal force can be provided by adhering fluidity improving particles via a binder onto the surface of iron powder.

Description

technical field [0001] The present invention relates to iron-based powders suitable for powder metallurgy applications and methods for their manufacture. Background technique [0002] The powder metallurgy technique is a technique of compression-molding a metal-based powder as a raw material using a die, and sintering the resulting green compact to obtain a product (sintered body). [0003] Powder metallurgy technology can significantly reduce the manufacturing cost of mechanical parts of complex shapes due to its ability to produce mechanical parts of complex shapes with extremely high dimensional accuracy. Therefore, various mechanical parts manufactured by powder metallurgy technology are used in many aspects. In addition, recently, the demand for miniaturization and weight reduction of mechanical parts has been increasing, and various raw material powders for powder metallurgy for manufacturing small, lightweight and sufficiently strong mechanical parts have been studie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F1/16
CPCB22F1/02C22C33/02C22C33/0264Y10T428/12181B22F1/108B22F1/16
Inventor 尾野友重宇波繁河野贵史尾崎由纪子
Owner JFE STEEL CORP
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