Method for producing mixed powder for powder metallurgy, method for producing sintered compact, and sintered compact

A mixed powder and powder metallurgy technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of reduced strength of sintered body, difficulty in increasing compacted powder density, solid solution hardening of steel powder, etc., and achieves high fluidity and easy operation Excellent efficiency and the effect of improving fluidity

Active Publication Date: 2018-04-17
JFE STEEL CORP
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Problems solved by technology

However, during sintering, each alloy element is not sufficiently diffused in Fe to form a non-uniform structure. As a result, the strength of the finally obtained sintered body may be poor.
In addition, when Mn, Cr, V, Si, etc. are used as alloy elements, these elements are more likely to be oxidized than Fe, so there is a problem that they are oxidized during sintering and the streng

Method used

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  • Method for producing mixed powder for powder metallurgy, method for producing sintered compact, and sintered compact

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Embodiment

[0110] Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to the following examples.

[0111] Mixed powder for powder metallurgy was produced by the following procedure.

[0112] (first mixing process)

[0113] The raw material mixed powder is obtained by mixing the Mo-containing powder and the Cu-containing powder in the iron-based powder. As the above-mentioned iron-based powder, atomized raw powder having an apparent density shown in Table 1 was used. The specific surface area of ​​the iron-based powder is 0.39m 2 / g. Mo oxide powder having an average particle diameter of 10 μm was used as the Mo-containing powder. As the Cu-containing powder, cuprous oxide powder having an average particle diameter shown in Table 1 was used. The above mixing was performed for 15 minutes using a V-type mixer. In addition, the compounding quantity of each powder was adjusted so that content of Mo and Cu in the...

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Abstract

Provided is a mixed powder for powder metallurgy with which it is possible to obtain a sintered compact that, despite not containing Ni, has an excellent tensile strength and ductility equivalent to or better than those of a sintered compact containing Ni. This method for producing a mixed powder for powder metallurgy includes: a first mixing step, in which a starting material mixed powder is obtained by mixing a Mo-containing powder and a Cu-containing powder into an iron-based powder; a diffusion/adhering step, in which a partially-diffused alloyed steel powder is obtained by diffusing and adhering the Mo and Cu onto the surface of the iron-based powder by heat-treating the starting material mixed powder; and a second mixing step, in which the mixed powder for powder metallurgy is obtained by mixing a graphite powder into the partially-diffused alloyed steel powder. The average grain diameter of the iron-based powder is 30-120 [mu]m. A cuprous oxide powder is used as the Cu-containing powder. The component composition of the mixed powder for powder metallurgy is 0.2-1.5 mass% Mo, 0.5-4.0 mass% Cu, and 0.1-1.0 mass% C, with the remainder comprising Fe and unavoidable impurities.

Description

technical field [0001] The present invention relates to a method for producing a mixed powder for powder metallurgy, and more particularly, to a method for producing a mixed powder for powder metallurgy that has properties suitable for manufacturing high-strength sintered parts for automobiles, etc., although it does not contain Ni. Moreover, this invention relates to the manufacturing method of a sintered body, and the sintered body obtained by the said manufacturing method. Background technique [0002] Powder metallurgy technology enables the manufacture of complex-shaped components in a shape that closely approximates the product shape (so-called near-net shape) and with high dimensional accuracy. Therefore, when using powder metallurgy technology to make parts, cutting costs can be greatly reduced. Therefore, powder metallurgy products to which powder metallurgy technology is applied are used in various fields as parts for various machines. [0003] In this powder met...

Claims

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Application Information

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IPC IPC(8): B22F1/00C22C33/02C22C38/00C22C38/16B22F1/10B22F1/12
CPCC22C38/00C22C38/16C22C1/05C22C33/0264C22C38/12B22F1/10B22F1/12B22F3/12B22F5/00B22F9/04C22C33/02B22F2998/10
Inventor 小林聪雄中村尚道前谷敏夫园部秋夫佐藤伊都也
Owner JFE STEEL CORP
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