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Metal powder for powder metallurgy and sintered body

a technology of metal powder and sintered body, which is applied in the field of metal powder for powder metallurgy and a sintered compact, can solve the problems of insufficient densification of sintered compact, slow rate of atomic diffusion between particles, and significant reduction of sintering properties, and achieve excellent mechanical properties

Inactive Publication Date: 2015-01-01
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a metal powder for powder metallurgy that can easily produce a high-density, mechanically-properties sintered compact, even in cases of poor sintering properties or low temperatures. Additionally, a dense sintered compact can be produced using this metal powder.

Problems solved by technology

However, there is a case where the rate of the atomic diffusion between particles may be slow depending on a composition of the metal powder.
In this case, there is a concern that a sintering property will be significantly decreased, and thereby the densification of the sintered compact will not progress sufficiently.
Specifically, for example, in a case where the metal powder used is a powder with a composition by which an atomic arrangement becomes a face-centered cubic lattice at a sintering temperature, each atom is arranged into a dense face-centered cubic lattice structure at the sintering temperature, and thereby the progress of the sintering is obstructed and the densification is difficult to progress.
Therefore, in regard to such a metal powder, even when a sintered compact is obtained by a method disclosed in JP-A-6-10088, in the obtained sintered compact, the densification becomes insufficient and thereby mechanical properties deteriorate.
In addition, regardless of the composition of the metal powder, the densification of a sintered compact is difficult to progress in a low temperature sintering range, and it is difficult to improve mechanical properties of the obtained sintered compact.
On the contrary, when the sintering temperature is raised to improve mechanical properties, a temperature variation easily occurs, such that the progress of densification may be nonuniform, and thereby it is difficult to expect a sufficient improvement in mechanical properties.
Therefore, dimensional accuracy of the sintered compact is decreased, and the time and cost necessary for the sintering are considerably increased.

Method used

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  • Metal powder for powder metallurgy and sintered body
  • Metal powder for powder metallurgy and sintered body

Examples

Experimental program
Comparison scheme
Effect test

example 1a

[0152](1) First, SUS 316L series powder (manufactured by Epson Atmix Corporation) with a composition shown in Table 1, which was produced by a water atomizing method, was prepared. In addition, a mean particle size of the SUS 316L series powder was 9.87 μm, a tap density was 4.38 g / cm3, and a specific surface area was 0.24 m2 / g. In addition, a melting point of the SUS 316L material was substantially 1400° C.

[0153]In addition, compositions of the powder shown in Table 1 were identified by an inductively-coupled high frequency plasma emission spectrometry method (ICP method). In addition, in the ICP analysis, an ICP apparatus (CIROS 120 type, manufactured by Rigaku corporation) was used.

TABLE 1(SUS 316L)Evaluation resultComposition of metal powder of powder metallurgyof sinteredCSiZrcompact(c)(b)NiCrMo(a)Fea / bc / bRelative densitymass %mass %mass %mass %mass %mass %———%Example 1A0.3512.4816.312.090.04Remainder0.11497.7Example 2A0.5712.6416.442.070.06Remainder0.10598.0Example 3A0.7812.45...

examples 2a to 7a

[0168]Sintered bodies were obtained similarly to Example 1A, except that a composition of the metal powder for powder metallurgy was changed as shown in Table 1.

example 1b

[0170]First, an SCM 415 series powder (produced by Epson Atmix Corporation) that had a composition shown in Table 2 and was produced by a water atomizing method was prepared. In addition, a mean particle size of the SCM415 series powder was 9.74 μm.

[0171]Next, similarly to Example 1A, a sintered compact was obtained. In addition, a heating temperature at the time of the heating was set to 87% of a melting point of the SCM 415 material.

TABLE 2(SCM415)Evaluation resultComposition of metal powder of powder metallurgyof sinteredCSiZrcompact(c)(b)NiCrMo(a)Fea / bc / bRelative densitymass %mass %mass %mass %mass %mass %———%Example 1B0.150.351.010.240.06Remainder0.1710.42993.7Example 2B0.160.790.990.220.05Remainder0.0630.20397.0Example 3B0.170.411.030.210.03Remainder0.0730.41596.6Example 4B0.150.651.050.240.04Remainder0.0620.23196.7Comparative0.150.251.000.210.00Remainder0.0000.60093.1Example 1BComparative0.140.151.020.250.00Remainder0.0000.93393.1Example 2BComparative0.140.831.050.230.00Remai...

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Abstract

There is provided a metal powder for powder metallurgy including Zr and Si in a manner such that following conditions of (A) and (B) are satisfied, wherein a remainder thereof includes at least one element selected from the group consisting of Fe, Co and Ni, (A) the mass ratio of a content of Zr to a content of Si is 0.03 to 0.3, and (B) the content of Si is 0.35 to 1.5% by mass.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional of U.S. patent application Ser. No. 13 / 114,370 filed on May 24, 2011. This application claims the benefit of Japanese Patent Application No. 2010-143441 filed Jun. 24, 2010. The disclosures of the above applications are incorporated herein by reference.BACKGROUND[0002]1. Technical Field[0003]The present invention relates to a metal powder for powder metallurgy and a sintered compact.[0004]2. Related Art[0005]In a powder metallurgy method, after a composition including a metal powder and a binder is molded to have a desired shape and thereby a green part is obtained, the green part is debinded and sintered, and thereby a sintered compact is produced. In a producing process of such a sintered compact, an atomic diffusion phenomenon occurs between particles of the metal powder, and thereby the green part is gradually densified and is sintered.[0006]For example, in JP-A-6-10088, there is disclosed a method of ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C38/50C22C38/22C22C38/02C22C38/28C22C38/14C22C38/08C22C38/44B22F1/00
CPCC22C38/50B22F1/0003C22C38/44C22C38/02B22F2301/35C22C38/22C22C38/08C22C38/14B22F3/10C22C38/28C22C33/0264B22F1/00
Inventor NAKAMURA, HIDEFUMI
Owner SEIKO EPSON CORP