Title:
RARE EARTH SINTERED MAGNET, METHOD FOR PRODUCING SAME, MOTOR AND AUTOMOBILE
Document Type and Number:
WIPO Patent Application WO/2011/122577
Kind Code:
A1
Abstract:
Disclosed is a rare earth sintered magnet (10) which comprises: a magnet base body that contains a rare earth compound; and a protective layer that is arranged on the magnet base body and comprises a first layer and a second layer that are sequentially arranged from the magnet base body side. The surface portion of the magnet base body has a higher heavy rare earth element content than the inside portion of the magnet base body, said inside portion being surrounded by the surface portion. The first layer contains a rare earth oxide and has a mass ratio of the heavy rare earth elements to the light rare earth elements of 1 or more. The second layer contains an oxide that contains iron and/or boron and is different from the rare earth oxide. The second layer has a lower rare earth oxide content than the first layer.
Inventors:
TANAKA Satoshi (1-13-1 Nihonbashi, Chuo-k, Tokyo 72, 〒1038272, JP)
田中 哲 (〒72 東京都中央区日本橋一丁目１３番１号 ＴＤＫ株式会社内 Tokyo, 〒1038272, JP)
BABA Fumitaka (1-13-1 Nihonbashi, Chuo-k, Tokyo 72, 〒1038272, JP)
馬場 文崇 (〒72 東京都中央区日本橋一丁目１３番１号 ＴＤＫ株式会社内 Tokyo, 〒1038272, JP)
田中 哲 (〒72 東京都中央区日本橋一丁目１３番１号 ＴＤＫ株式会社内 Tokyo, 〒1038272, JP)
BABA Fumitaka (1-13-1 Nihonbashi, Chuo-k, Tokyo 72, 〒1038272, JP)
馬場 文崇 (〒72 東京都中央区日本橋一丁目１３番１号 ＴＤＫ株式会社内 Tokyo, 〒1038272, JP)
Application Number:
JP2011/057684
Publication Date:
October 06, 2011
Filing Date:
March 28, 2011
Export Citation:
Assignee:
TDK Corporation (1-13-1, Nihonbashi Chuo-k, Tokyo 72, 〒1038272, JP)
ＴＤＫ株式会社 (〒72 東京都中央区日本橋一丁目１３番１号 Tokyo, 〒1038272, JP)
TANAKA Satoshi (1-13-1 Nihonbashi, Chuo-k, Tokyo 72, 〒1038272, JP)
田中 哲 (〒72 東京都中央区日本橋一丁目１３番１号 ＴＤＫ株式会社内 Tokyo, 〒1038272, JP)
BABA Fumitaka (1-13-1 Nihonbashi, Chuo-k, Tokyo 72, 〒1038272, JP)
ＴＤＫ株式会社 (〒72 東京都中央区日本橋一丁目１３番１号 Tokyo, 〒1038272, JP)
TANAKA Satoshi (1-13-1 Nihonbashi, Chuo-k, Tokyo 72, 〒1038272, JP)
田中 哲 (〒72 東京都中央区日本橋一丁目１３番１号 ＴＤＫ株式会社内 Tokyo, 〒1038272, JP)
BABA Fumitaka (1-13-1 Nihonbashi, Chuo-k, Tokyo 72, 〒1038272, JP)
International Classes:
H01F1/053; B22F3/00; B22F3/24; C22C33/02; C22C38/00; H01F1/08; H01F7/02; H01F41/02
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (SOEI PATENT AND LAW FIRM, Marunouchi MY PLAZA 9th fl. 1-1, Marunouchi 2-chome, Chiyoda-k, Tokyo 05, 〒1000005, JP)
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Claims: