Title:
PRODUCTION METHOD OF PHOSPHATE-COATED SmFeN-BASE ANISOTROPIC MAGNETIC POWDER, AND BOND MAGNET
Document Type and Number:
WIPO Patent Application WO/2022/107462
Kind Code:
A1
Abstract:
A production method of an anisotropic magnetic powder having excellent hot water resistance, and a bond magnet, are provided. The present invention relates to a production method of a phosphate-coated SmFeN-base anisotropic magnetic powder involving: a phosphate treatment step in which an inorganic acid is added to a slurry containing an SmFeN-base anisotropic magnetic powder, water and a phosphate compound to adjust the pH of the slurry to 1-4.5, thereby obtaining an SmFeN-base anisotropic magnetic powder coated on the surface with a phosphate; and an oxide step in which the phosphate-coated SmFeN-base anisotropic magnetic powder is heat-treated at 200-330°C in an oxygenous atmosphere.
Inventors:
ABE MASAHIRO (JP)
YAMANAKA SATOSHI (JP)
TADA SHUICHI (JP)
IWAI KENTA (JP)
YAMANAKA SATOSHI (JP)
TADA SHUICHI (JP)
IWAI KENTA (JP)
Application Number:
PCT/JP2021/036189
Publication Date:
May 27, 2022
Filing Date:
September 30, 2021
Export Citation:
Assignee:
NICHIA CORP (JP)
International Classes:
B22F1/16; B22F1/00; B22F3/00; B22F9/20; C22C38/00; H01F1/059; H01F41/02
Foreign References:
| JP2002043109A | 2002-02-08 | |||
| JP2019176160A | 2019-10-10 | |||
| JP2020056101A | 2020-04-09 | |||
| JPH01234502A | 1989-09-19 | |||
| CN111411325A | 2020-07-14 |
Attorney, Agent or Firm:
YASUTOMI & ASSOCIATES (JP)
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