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

Patent metadata

Field	Value
Publication number	US-2015114178-A1
Application number	US-201414527895-A
Country	US
Kind code	A1
Filing date	Oct 30, 2014
Priority date	Oct 31, 2013
Publication date	Apr 30, 2015
Grant date	—

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.

First claim

What is claimed is:

1 . A metal powder for powder metallurgy, comprising:
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.

2 . The metal powder for powder metallurgy according to claim 1 , wherein the metal powder has a crystal structure of martensite-based stainless steel.

3 . The metal powder for powder metallurgy according to claim 1 , wherein a content ratio of the Zr to the Nb (Zr/Nb) is 0.3 or more and 3 or less.

4 . The metal powder for powder metallurgy according to claim 1 , wherein a content sum of the Zr and Nb is 0.05% by mass or more and 0.6% by mass or less.

5 . The metal powder for powder metallurgy according to claim 1 , wherein when a content sum of the Zr and the Nb is represented by (Zr+Nb), a ratio of (Zr+Nb) to the Si, (Zr+Nb)/Si, is 0.1 or more and 0.7 or less.

6 . The metal powder for powder metallurgy according to claim 1 , wherein the Mn is contained therein in a proportion of 0.01% by mass or more and 1.25% by mass or less.

7 . The metal powder for powder metallurgy according to claim 1 , wherein the Ni is contained therein in a proportion of 0.05% by mass or more and 0.6% by mass or less.

8 . The metal powder for powder metallurgy according to claim 1 , wherein the metal powder has an average particle diameter of 0.5 μm or more and 30 μm or less.

9 . A compound, comprising:
a metal powder for powder metallurgy including:
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; and
a binder which binds particles of the metal powder for powder metallurgy to one another.

10 . The compound according to claim 9 , wherein the metal powder has a crystal structure of martensite-based stainless steel.

11 . The compound according to claim 9 , wherein a content ratio of the Zr to the Nb (Zr/Nb) is 0.3 or more and 3 or less.

12 . The compound according to claim 9 , wherein a content sum of the Zr and Nb is 0.05% by mass or more and 0.6% by mass or less.

13 . The compound according to claim 9 , wherein when a content sum of the Zr and the Nb is represented by (Zr+Nb), a ratio of (Zr+Nb) to the Si, (Zr+Nb)/Si, is 0.1 or more and 0.7 or less.

14 . A granulated powder, wherein the granulated powder is obtained by granulating the metal powder for powder metallurgy according to claim 1 .

15 . A granulated powder, wherein the granulated powder is obtained by granulating the metal powder for powder metallurgy according to claim 2 .

16 . A granulated powder, wherein the granulated powder is obtained by granulating the metal powder for powder metallurgy according to claim 3 .

17 . A granulated powder, wherein the granulated powder is obtained by granulating the metal powder for powder metallurgy according to claim 4 .

18 . A granulated powder, wherein the granulated powder is obtained by granulating the metal powder for powder metallurgy according to claim 5 .

19 . A sintered body produced by sintering a metal powder for powder metallurgy containing:
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.

20 . The sintered body according to claim 19 , wherein the sintered body has a relative density of 97% or more and a surface Vickers hardness of 570 or more.

Assignees

• Seiko Epson Corp

Inventors

• Ishigami Hideki
• Nakamura Hidefumi
• Shiohara Yukihiko

Classifications

• B22F1/00

  Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties · CPC title

• B22F1/103

  containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent · CPC title

• C22C33/0285 Primary

  with Cr, Co, or Ni having a minimum content higher than 5% · CPC title

• B22F3/10

  Sintering only · CPC title

• B22F1/0003 Primary

  Operations & Transport · mapped topic