Iron powder for dust cores

Patent metadata

Field	Value
Publication number	US-2016303652-A1
Application number	US-201314442217-A
Country	US
Kind code	A1
Filing date	Dec 2, 2013
Priority date	Dec 19, 2012
Publication date	Oct 20, 2016
Grant date	—

Abstract

The present invention provides iron powder for dust cores that has excellent compressibility and low iron loss after formation. In the iron powder for dust cores, Si content is 0.01 mass % or less, apparent density is 3.8 g/cm 3 or more, the ratio of iron powder particles with a particle size of 45 μm or less is 10 mass % or less, the ratio of iron powder particles with a particle size of over 180 μm and 250 μm or less is less than 30 mass %, the ratio of iron powder particles with a particle size of over 250 μm is 10 mass % or less, and the Vickers hardness (test force: 0.245 N) of a powder cross-section is 80 Hv or less.

First claim

1 . An iron powder for dust cores, comprising pure iron powder obtained by a water atomizing method, wherein
in the pure iron powder,
Si content is 0.01 mass % or less;
an apparent density is 3.8 g/cm 3 or more;
a ratio of iron powder particles with a particle size of 45 μm or less is 10 mass % or less;
a ratio of iron powder particles with a particle size of over 180 μM and 250 μm or less is less than 30 mass %;
a ratio of iron powder particles with a particle size of over 250 μm is 10 mass % or less; and
a Vickers hardness (test force: 0.245 N) of a powder cross-section is 80 Hv or less.

Assignees

• Jef Steel Corp
• Jfe Steel Corp

Inventors

• Takashita Takuya
• Nakamura Naomichi

Classifications

• B22F1/102

  Metallic powder coated with organic material · CPC title

• B22F1/08

  Metallic powder characterised by particles having an amorphous microstructure · CPC title

• B22F1/052 Primary

  characterised by a mixture of particles of different sizes or by the particle size distribution · CPC title

• C22C38/002

  containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60 · CPC title

• B22F2009/0828

  with water · CPC title