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Metal powder for powder metallurgy, compound, granulated powder, and sintered body

a technology of metal powder and powder metallurgy, which is applied in the field of metal powder for powder metallurgy, a compound, a granulated powder, and a sintered body, can solve the problems of increasing workload and cost, and achieve the effect of high density

Inactive Publication Date: 2015-04-30
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

This patent describes a method for producing a high-density and strong metal powder by controlling the timing of crystal growth during the sintering process. By adding specific elements like zirconium and niobium, pores can be minimized and the resulting material has excellent mechanical properties. This method also allows for the production of a sintered body with a high density and excellent corrosion resistance. Overall, this patent provides a technique for producing high-quality metal powder and sintered bodies with superior mechanical properties.

Problems solved by technology

However, this result in a significant increase in workload, and also an increase in cost cannot be avoided.

Method used

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examples

[0179]Next, examples of the invention will be described.

1. Production of Sintered Body Involving Molding by Injection Molding Method

Sample No. 1

[0180](1) First, a metal powder having a composition shown in Table 1 produced by a water atomization method was prepared. This metal powder had an average particle diameter of 3.86 μm, a tap density of 4.38 g / cm3, and a specific surface area of 0.24 m2 / g.

[0181]The composition of the powder shown in Table 1 was identified and determined by an inductively coupled high-frequency plasma optical emission spectroscopy (ICP method). In the ICP analysis, an ICP apparatus (model: CIROS-120) manufactured by Rigaku Corporation was used. Further, in the identification and determination of C and S, a carbon-sulfur analyzer (CS-200) manufactured by LECO Corporation was used. Further, in the identification and determination of O, an oxygen-nitrogen analyzer (TC-300 / EF-300) manufactured by LECO Corporation was used.

[0182](2) Subsequently, the metal powder ...

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Abstract

A metal powder for powder metallurgy contains Fe as a principal component, Cr in a proportion of 10% by mass or more and 30% by mass or less, C in a proportion of 0.15% by mass or more and 1.5% by mass or less, Si in a proportion of 0.3% by mass or more and 1% by mass or less, Zr in a proportion of 0.01% by mass or more and 0.5% by mass or less, Nb in a proportion of 0.01% by mass or more and 0.5% by mass or less, and Mn and Ni in a total proportion of 0.05% by mass or more and 1.6% by mass or less. Further, the metal powder for powder metallurgy preferably has a crystal structure of martensite-based stainless steel.

Description

BACKGROUND[0001]1. Technical Field[0002]The present invention relates to a metal powder for powder metallurgy, a compound, a granulated powder, and a sintered body.[0003]2. Related Art[0004]In a powder metallurgy method, a composition containing a metal powder and a binder is molded into a desired shape to obtain a molded body, and the obtained molded body is degreased and sintered, whereby a sintered body is produced. In such a process for producing a sintered body, an atomic diffusion phenomenon occurs among particles of the metal powder, and thereby the molded body is gradually densified, resulting in sintering.[0005]For example, JP-A-2012-87416 proposes a metal powder for powder metallurgy containing Zr and Si, wherein the remainder thereof contains at least one element selected from the group consisting of Fe, Co and Ni, and inevitable elements. According to such a metal powder for powder metallurgy, the sinterability is enhanced by the action of Zr, and a sintered body having ...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F3/10B22F1/103
CPCB22F1/0003B22F2301/35B22F3/10B22F3/1021C22C38/02C22C38/04C22C38/48C22C38/50B22F1/103B22F1/00C22C33/0285B22F2998/10
Inventor ISHIGAMI, HIDEKINAKAMURA, HIDEFUMISHIOHARA, YUKIHIKO
Owner SEIKO EPSON CORP
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