Iron-based powder for powder metallurgy

Patent metadata

Field	Value
Publication number	US-9352393-B2
Application number	US-201314650092-A
Country	US
Kind code	B2
Filing date	Dec 24, 2013
Priority date	Dec 28, 2012
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

An iron-based powder for powder metallurgy effectively prevents agglomeration of a lubricant, has excellent flowability, can evenly fill thin-walled cavities, keeps the ejection force after formation low, and does not lower sintered body strength by adhering either or both of an alloy component and a cutting ability improving agent to the surface of iron powder with a binder that has a melting point of 150° C. or lower, adhering carbon black to the surface of the binder, and setting the amount of free binder to 0.02 mass % or less.

First claim

The invention claimed is:

1. Iron-based powder for powder metallurgy, wherein either or both of an alloy component and a cutting ability improving agent are adhered to a surface of an iron powder for powder metallurgy by a binder with a melting point of 150° C. or lower, carbon black is adhered to a surface of the binder, and an amount of free binder is 0.02 mass % or less.

2. The iron-based powder for powder metallurgy of claim 1 , wherein coverage of the surface of the iron powder by the binder is from 30% to 100% of a surface area of the iron powder.

3. The iron-based powder for powder metallurgy of claim 1 , wherein the binder is one or a mixture selected from the group consisting of fatty acid, fatty acid amide, fatty acid bisamide, and metal soap.

4. The iron-based powder for powder metallurgy of claim 1 , wherein coverage of a bonding surface of the binder by the carbon black is 30% or more of a bonding surface area of the binder.

5. The iron-based powder for powder metallurgy of claim 1 , wherein a specific surface area of the carbon black is in a range of 50 m 2 /g to 100 m 2 /g.

6. The iron-based powder for powder metallurgy of claim 1 , wherein a specific surface area of the iron powder is in a range of 0.01 m 2 /g to 0.1 m 2 /g.

7. The iron-based powder for powder metallurgy of claim 1 , wherein a specific surface area of the iron-based powder for powder metallurgy is in a range of 0.05 m 2 /g to 0.5 m 2 /g.

8. The iron-based powder for powder metallurgy of claim 2 , wherein the binder is one or a mixture selected from the group consisting of fatty acid, fatty acid amide, fatty acid bisamide, and metal soap.

9. The iron-based powder for powder metallurgy of claim 8 , wherein coverage of a bonding surface of the binder by the carbon black is 30% or more of a bonding surface area of the binder.

10. The iron-based powder for powder metallurgy of claim 9 , wherein a specific surface area of the carbon black is in a range of 50 m 2 /g to 100 m 2 /g.

11. The iron-based powder for powder metallurgy of claim 10 , wherein a specific surface area of the iron powder is in a range of 0.01 m 2 /g to 0.1 m 2 /g.

12. The iron-based powder for powder metallurgy of claim 11 , wherein a specific surface area of the iron-based powder for powder metallurgy is in a range of 0.05 m 2 /g to 0.5 m 2 /g.

13. The iron-based powder for powder metallurgy of claim 2 , wherein coverage of a bonding surface of the binder by the carbon black is 30% or more of a bonding surface area of the binder.

14. The iron-based powder for powder metallurgy of claim 2 , wherein a specific surface area of the carbon black is in a range of 50 m 2 /g to 100 m 2 /g.

15. The iron-based powder for powder metallurgy of claim 2 , wherein a specific surface area of the iron powder is in a range of 0.01 m 2 /g to 0.1 m 2 /g.

16. The iron-based powder for powder metallurgy of claim 2 , wherein a specific surface area of the iron-based powder for powder metallurgy is in a range of 0.05 m 2 /g to 0.5 m 2 /g.

17. The iron-based powder for powder metallurgy of claim 3 , wherein coverage of a bonding surface of the binder by the carbon black is 30% or more of a bonding surface area of the binder.

18. The iron-based powder for powder metallurgy of claim 3 , wherein a specific surface area of the carbon black is in a range of 50 m 2 /g to 100 m 2 /g.

19. The iron-based powder for powder metallurgy of claim 3 , wherein a specific surface area of the iron powder is in a range of 0.01 m 2 /g to 0.1 m 2 /g.

20. The iron-based powder for powder metallurgy of claim 3 , wherein a specific surface area of the iron-based powder for powder metallurgy is in a range of 0.05 m 2 /g to 0.5 m 2 /g.

Assignees

• Jfe Steel Corp

Inventors

• Ono Tomoshige
• Ozaki Yukiko
• Kawano Takashi

Classifications

• B22F1/05

  Metallic powder characterised by the size or surface area of the particles · CPC title

• B22F1/108

  Mixtures obtained by warm mixing · CPC title

• B22F1/16

  Metallic particles coated with a non-metal (coated with lubricating or binding agents or with organic material B22F1/10) · CPC title

• B22F1/10

  Metallic powder containing lubricating or binding agents; Metallic powder containing organic material · CPC title

• B22F1/102

  Metallic powder coated with organic material · CPC title