Method for manufacturing Fe-based sintered alloy member having excellent dimensional accuracy, strength and sliding performance

Inactive Publication Date: 2006-05-18
MITSUBISHI MATERIALS PMG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] (a) In the conventional method of manufacturing the Fe-based sintered alloy member by blending and mixing an Fe powder, a graphite powder, and a Cu powder and by forming and sintering the resultant mixture, when the mixture of an Fe powder, a graphite powder, and a Cu powder is sintered, the Cu powder is melted into a Cu liquid phase, which exhibits excellent wettability with respect to Fe. Accordingly, Cu in the liquid phase infiltrates into the boundary of the Fe powder to weaken the bonding between the particles in the Fe powder, thereby decreasing the strength of the sintered body, which expands the sintered body to deteriorate the dimensional accuracy.
[0062] Therefore, the method of manufacturing the Fe-based sintered alloy member having excellent dimensional accuracy, strength, and sliding performance according to the present invention comprises the steps of: preparing a Cu alloy powder having compositions described in (1) to (8), an Fe powder, and a graphite powder, as a base powder; blending the base powder in a predetermined amount; mixing the resultant powder with a zinc stearate powder or Ethylene-bis-Amide as a lubricant using a double-cone mixer; press-forming the mixture to form a green compact; and sintering the green compact in a hydrogen atmosphere including nitrogen at a temperature of 1090 to 1300° C. At this time, the sintering temperature ranges more preferably 1100 to 1260° C.

Problems solved by technology

Accordingly, Cu in the liquid phase infiltrates into the boundary of the Fe powder to weaken the bonding between the particles in the Fe powder, thereby decreasing the strength of the sintered body, which expands the sintered body to deteriorate the dimensional accuracy.

Method used

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Embodiment Construction

[0063] As a base powder, atomized an Fe powder having a mean particle size of 80 μm, a graphite powder having a mean particle size of 15 μm, a Cu alloy powder having a mean particle size and compositions shown in Table 1, a pure Cu powder, and a MnO powder were prepared.

TABLE 1Composition (wt %)Cu andinevitableKindFeOMnZnAlSiimpuritiesCuA1.20.25————balancealloyB4.10.36————balancepowderC9.50.52————balanceD5.20.350.8———balanceE3.80.686.5———balanceF4.50.9414.3———balanceG2.90.31—9.3——balanceH4.10.58—5.2——balanceI3.70.67—0.25——balanceJ3.30.421.81.5——balanceK3.80.811.87.4——balanceL5.20.880.580.84——balanceM4.40.45———0.03balanceN4.70.42——0.03—balanceO4.10.77——0.930.94balanceP4.20.491.13.60.060.07balanceQ3.70.507.62.20.040.06balanceR 0.5*0.21————balanceS11*  0.45————balanceT3.80.1*————balanceU6.71.2*————balance

[0064] The values attached with symbol * denote that the values are out of the range of the present invention.

[0065] The base powder was blended to have a blending composition shown...

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Abstract

In a method of manufacturing an Fe-based sintered alloy member having excellent dimensional accuracy, strength, and sliding performance, and having a composition comprising: Cu: 0.5 to 7 wt %; C: 0.1 to 0.98 wt %; oxygen: 0.02 to 0.3 wt %; as needed, Mn: 0.0025 to 1.05 wt % and / or Zn: 0.001 to 0.7 wt %; and a balance of Fe and inevitable impurities by blending and mixing an Fe powder, a graphite powder, and a Cu alloy powder as a base powder and by forming and sintering the resultant mixture, in which the Cu alloy powder blended as the base powder has a composition comprising: Fe: 1 to 10 wt %; oxygen: 0.2 to 1 wt %; as needed, Zn: 0.2 to 10 wt % and / or Mn: 0.5 to 15 wt %; and a balance of Cu and inevitable impurities.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method of manufacturing an Fe-based sintered alloy member having excellent dimensional accuracy, strength and sliding performance, which is used in manufacturing mechanical parts such as oil pump gears. [0003] 2. Description of Related Art [0004] Recently, with the advancements in the methods of manufacturing an Fe-based sintered alloy member having excellent dimensional accuracy, strength, and sliding performance, it is possible to accurately produce various mechanical parts made of an Fe-based sintered alloy member having excellent dimensional accuracy, strength, and sliding performance in a large amount. As an example of the method of manufacturing an Fe-based sintered alloy member having excellent dimensional accuracy, strength, and sliding performance, there is disclosed a method of manufacturing an Fe-based sintered alloy member having excellent dimensional accuracy, strength...

Claims

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Application Information

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IPC IPC(8): B22F3/02
CPCC22C33/0207C22C33/0257
InventorKAWASE, KINYAISHII, YOSHINARI
OwnerMITSUBISHI MATERIALS PMG CORP