Title:
RARE EARTH MAGNET AND ITS MANUFACTURING METHOD
Document Type and Number:
Japanese Patent JP3724739
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a rare earth magnet by which dust discharging characteristics are restrained and failure of operation of a mounting apparatus is prevented, and to provide its manufacturing method.
SOLUTION: This manufacturing method for the rare earth magnet has, after a step for performing a soaking process for a rare earth magnet element 1 under a condition of unconducting electricity in a reserve soaking bath 20 comprising an organic compound having a sulfur, a step for performing an electrolytic plating process for the rare earth magnet element 1 by using an electroplating bath 30, to form a protective film 2. Growing of the protective film 2 is relatively accelerated at a recessed part 1A than a protruding part 1B of the rare earth magnet element 1, and the growth process of the protective film 2 is so controlled that the film becomes almost flat as a whole, so that surface roughness of the protective film 2 becomes 0.4 μm or less. In this protective film 2, a protruding part 2B is hard to come off due to oscillation and impulse, etc., so that it is hard to fly as dust.
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Inventors:
Osamu Shinoura
Application Number:
JP2003045111A
Publication Date:
December 07, 2005
Filing Date:
February 21, 2003
Export Citation:
Assignee:
tdk Corporation
International Classes:
C25D3/38; C25D5/34; C25D7/00; H01F41/02; (IPC1-7): H01F41/02; C25D3/38; C25D5/34; C25D7/00
Domestic Patent References:
| JP5205926A | ||||
| JP2002212783A |
Attorney, Agent or Firm:
Yasushi Santanzaki
Yoichiro Fujishima
Yoichiro Fujishima