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Metal powder for powder metallurgy and iron-based sintered compact

A technology of powder metallurgy and metal powder, which is applied in the field of mixed powder for powder metallurgy, and can solve problems such as difficult uniform distribution, difficulty in making metal powder, and deviation in product quality

Inactive Publication Date: 2005-08-17
JX NIPPON MINING & METALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, this adds a new process, making the manufacturing process complicated, and there will be deviations in product quality
In addition, even if the metal powder of bismuth or lead is mixed, it is difficult to form a uniform distribution only by dispersing small particles, and because metal indium is a soft metal, it is difficult to make metal powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The synthesized indium stearate (In content: 12.0% by weight) was finely pulverized and passed through a sieve to obtain a fine powder of 250 mesh or less.

[0029] 0.8% by weight of indium stearate (abbreviated as "In" in Table 1 below) and 1.0% by weight of graphite powder were mixed with iron powder (Herganes reduced iron powder). At forming pressure 6t / cm 2 Under the conditions, the mixed powder (filling amount 1.5-2.5g) is made into a sample of about 10.06mmφ×2.70-4.55mmH.

[0030] In order to judge the moldability, the relationship between the molding density (GD) and the molding pressure of each molded body is shown in Table 1 (sample Nos. 291 to 298).

[0031] The formability of the mixed powder was evaluated for the sample, and the molded body of the sample was sintered in a batch atmosphere furnace at a sintering temperature of 1150° C. in a hydrogen atmosphere for 60 minutes. The density (SD) and the like of the sintered body are similarly shown in Table 1....

Embodiment 2

[0036] The synthesized bismuth stearate (Bi content: 12.0% by weight) was finely pulverized and passed through a sieve to obtain a fine powder of 250 mesh or less.

[0037] 0.4% by weight of the aforementioned bismuth stearate (abbreviated as "Bi" in Table 3 below), 0.4% by weight of indium stearate obtained in Example 1, and 1.0% by weight of graphite powder were mixed with respect to the iron powder (Herganes reduced iron powder). %. At forming pressure 6t / cm 2 Under the conditions, the mixed powder (filling amount 1.5~2.5g) is made into a sample of about 10.05mmφ×2.74~4.59mmH.

[0038] In order to judge the moldability, the relationship between the molding density (GD) and the molding pressure of each molded body is shown in Table 3 (sample Nos. 281 to 288). In addition, in the same table, indium stearate contains 0.4 weight% although the indium soap added together is not shown.

[0039] The formability of the mixed powder was evaluated for the sample under the same cond...

Embodiment 3

[0043] The synthesized nickel stearate (Ni content: 12.0% by weight) was finely pulverized and passed through a sieve to obtain a fine powder of 250 mesh or less.

[0044] With respect to the iron powder (Herganes reduced iron powder), 0.4% by weight of the aforementioned nickel stearate (abbreviated as "Ni" in Table 4 below), 0.4% by weight of indium stearate obtained in Example 1, and 1.0% by weight of graphite powder were mixed. %. At forming pressure 6t / cm 2 Under the conditions, the mixed powder (filling amount 1.5-2.5g) is made into a sample of about 9.93mmφ×2.59-4.48mmH.

[0045] In order to judge the moldability, the relationship between the molding density (GD) and the molding pressure of each molded body is shown in Table 4 (sample Nos. 221 to 228). In addition, in the same table, indium stearate contains 0.4 weight% although the indium soap added together is not shown.

[0046] Under the same conditions as in Example 1, the formability of the mixed powder was eva...

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PUM

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Abstract

Provided is metallic powder for powder metallurgy having iron as its principal component and containing indium soap, or metallic powder for powder metallurgy further comprising at least one type selected among bismuth soap, nickel soap, cobalt soap, copper soap, manganese soap and aluminum soap in such indium soap. Thereby obtained is metallic powder for powder metallurgy capable of easily improving the rustproof effect without having to hardly change the conventional process.A metal powder for powder metallurgy containing iron as a main component, characterized in that it further contains an indium soap; and the metal powder for powder metallurgy, characterized in that it still further contains, in addition to said indium, at least one selected from among a bismuth soap, a nickel soap, a cobalt soap, a copper soap, a manganese soap and a aluminum soap. The above mixed metal powder for powder metallurgy allows the production of a sintered compact exhibiting enhanced rust inhibiting effect with ease, with little change of a conventional process.

Description

technical field [0001] The present invention relates to a mixed powder for powder metallurgy used in the manufacture of sintered parts, brushes, etc., and in particular to a powder metallurgy metal suitable for manufacturing iron-based sintered parts with good rust resistance and the like used as a solid lubricant Powder and iron-based sintered body. Background technique [0002] Iron powder usually used for sintered mechanical parts, sintered oil-impregnated bearings, metal graphite brushes, etc. is easy to rust, and organic rust inhibitors such as benzotriazole are generally used in combination. [0003] However, although these organic antirust agents have a temporary antirust effect, they do not exist at all at the commonly used sintering temperature of 700° C. or higher because they decompose or volatilize at 50° C. or higher. Therefore, after sintering, it is in the same state as when it is not rust-proof, and it is very easy to rust. [0004] On the one hand, in orde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/02B22F1/10B22F1/105C22C33/02C22C38/00C22C38/04C22C38/08C22C38/10C22C38/16
CPCC22C38/04C22C38/002C22C33/02B22F1/007C22C33/0264C22C38/08C22C38/10C22C38/16B22F1/0059B22F2998/00B22F1/10B22F1/105
Inventor 矢作政隆伊森彻中村笃志成泽靖增田诚治
Owner JX NIPPON MINING & METALS CORP
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