Title:
圧粉磁芯用鉄粉
Document Type and Number:
Japanese Patent JP5929819
Kind Code:
B2
Abstract:
An iron powder for dust cores has an apparent density is 3.8 g/cm3 or more, a mean particle size (D50) is 80 μm or more, 60% or more of powder with a powder particle size of 100 μm or more has a mean grain size of 80 μm or more inside the powder particle, an area ratio of inclusions to a matrix phase of the powder is 0.4% or less, and a micro Vickers hardness (testing force: 0.245 N) of a powder cross-section is 90 Hv or less. It is thus possible to obtain iron powder for dust cores in order to manufacture a dust core that has low hysteresis loss even after the iron powder is formed and subjected to strain relief annealing.
More Like This:
Inventors:
Takuya Takashita
Naomichi Nakamura
Naomichi Nakamura
Application Number:
JP2013088720A
Publication Date:
June 08, 2016
Filing Date:
April 19, 2013
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
B22F1/05; C22C38/00; H01F1/24
Domestic Patent References:
| JP2006024869A | ||||
| JP2006283166A | ||||
| JP2007092162A | ||||
| JP2005187918A | ||||
| JP2010043361A | ||||
| JP2005248274A | ||||
| JP2012140679A | ||||
| JP2008277775A |
Attorney, Agent or Firm:
Kenji Sugimura
Kengo Yoshida
Kengo Yoshida