Title:
R-T-B TYPE RARE EARTH PERMANENT MAGNET, MOTOR, AUTOMOBILE, POWER GENERATOR, AND WIND POWER GENERATION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2012/002059
Kind Code:
A1
Abstract:
Provided is an R-T-B type rare earth permanent magnet which can attain high coercive force (Hcj) without enhancing the Dy concentration of an R-T-B type alloy and in which magnetization (Br) reduction, which is due to the addition of Dy, can be suppressed to attain excellent magnetic characteristics. An R-T-B type rare earth permanent magnet consisting of a sintered body which includes both a main phase that contains R2Fe14B as the main component and a grain boundary phase that has an R content higher than that of the main phase, and in which R is a rare earth element component that contains Nd and Dy as the essential elements, and the grain boundary phase comprises first and second grain boundary phases that are different in atomic concentration of Dy.
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Inventors:
NAKAJIMA Kenichiro (1505 Shimokagemori, Chichibu-sh, Saitama 93, 〒3691893, JP)
中島 健一朗 (〒93 埼玉県秩父市下影森１５０５番地 昭和電工株式会社内 Saitama, 〒3691893, JP)
中島 健一朗 (〒93 埼玉県秩父市下影森１５０５番地 昭和電工株式会社内 Saitama, 〒3691893, JP)
Application Number:
JP2011/061537
Publication Date:
January 05, 2012
Filing Date:
May 19, 2011
Export Citation:
Assignee:
SHOWA DENKO K.K. (13-9, Shibadaimon 1-chome Minato-k, Tokyo 18, 〒1058518, JP)
昭和電工株式会社 (〒18 東京都港区芝大門一丁目１３番９号 Tokyo, 〒1058518, JP)
NAKAJIMA Kenichiro (1505 Shimokagemori, Chichibu-sh, Saitama 93, 〒3691893, JP)
昭和電工株式会社 (〒18 東京都港区芝大門一丁目１３番９号 Tokyo, 〒1058518, JP)
NAKAJIMA Kenichiro (1505 Shimokagemori, Chichibu-sh, Saitama 93, 〒3691893, JP)
International Classes:
H01F1/053; C22C33/02; C22C38/00; H01F1/08
Attorney, Agent or Firm:
SHIGA Masatake et al. (1-9-2, Marunouchi Chiyoda-k, Tokyo 20, 〒1006620, JP)
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Claims: