Title:
METHOD FOR PRODUCING SOFT MAGNETIC IRON POWDER
Document Type and Number:
WIPO Patent Application WO/2018/139518
Kind Code:
A1
Abstract:
[Problem] To provide a method for producing soft magnetic iron powder that effectively increases the percentage of amorphousness of the soft magnetic iron powder even when the content of iron triad elements (Fe, Co and Ni) is high. [Solution] Provided is a method for producing soft magnetic iron powder by spraying high pressure water, which impacts a molten metal stream that is falling in the vertical direction, to divide the molten metal stream and form metal powder, and cooling the metal powder to produce the soft magnetic iron powder. When the amount of the molten metal stream that falls per unit time is Qm (kg/min) and the volume of the high pressure water sprayed per unit time is Qaq (kg/min), the mass ratio (Qaq/Qm) is at least 50 and the total content of iron triad components (Fe, Ni, Co) is at least 76 at%.
Inventors:
NAKASEKO MAKOTO (JP)
NAKAMURA NAOMICHI (JP)
MURAKI MINEO (JP)
TAKASHITA TAKUYA (JP)
NAKAMURA NAOMICHI (JP)
MURAKI MINEO (JP)
TAKASHITA TAKUYA (JP)
Application Number:
PCT/JP2018/002228
Publication Date:
August 02, 2018
Filing Date:
January 25, 2018
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B22F9/08; C22C38/00; C22C45/02; H01F1/153; B22F1/05; B22F1/08
Domestic Patent References:
| WO2015151420A1 | 2015-10-08 |
Foreign References:
| JPS6455308A | 1989-03-02 | |||
| JPS6082604A | 1985-05-10 | |||
| JP2004156134A | 2004-06-03 |
Other References:
R. M. GERMAN ET AL.: "Powder Metallurgy Science", June 1996, UCHIDA ROKAKUHO PUBLISHING CO., LTD., TOKYO, ISBN: 4-7536-5091-X
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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