Title:
MANUFACTURE OF Fe-B-R PERMANENT MAGNET HAVING CORROSION-RESISTING COATING
Document Type and Number:
Japanese Patent JP3187396
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To realize a method for easily and inexpensively manufacturing an Fe-B-R permanent magnet, whose magnet surface has a corrosion resisting coating with superior adhesiveness with the magnet for developing stable high magnetic characteristics without deteriorating the magnetic characteristics, even when this magnet is left as it is for a long time at high temperature and high humidity condition of 80°C temperature and relative humidity of 90%, without subjecting the magnet to plating treatment or treatment using hexavalent chromium.
SOLUTION: An Fe-B-R permanent magnet and a metallic piece are placed in a treatment vessel, and vibration is applied to them in the treatment container, and/or they are stirred so that a metallic coating can be formed on the magnetic surface. Then, sol solution obtained through hydrolytic reaction and polymer reaction of a metallic compound being the material of a metallic oxide coating is applied on the metallic coating, and heat treatment is carried out so that the metallic oxide coating can be formed.
Inventors:
Takeshi Nishiuchi
Koji Yoshimura
Fumiaki Kikui
Koji Yoshimura
Fumiaki Kikui
Application Number:
JP22669999A
Publication Date:
July 11, 2001
Filing Date:
August 10, 1999
Export Citation:
Assignee:
Sumitomo Special Metal Co., Ltd.
International Classes:
H01F1/08; B22F3/24; C22C38/00; H01F41/02; (IPC1-7): H01F41/02; B22F3/24; C22C38/00; H01F1/08
Domestic Patent References:
| JP2251110A | ||||
| JP4237103A |
Attorney, Agent or Firm:
Shimizu Yoshi Hiro (2 people outside)