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Title:
R-T-B BASED RARE EARTH PERMANENT MAGNET, MOTOR, AUTOMOBILE, POWER GENERATOR AND WIND ENERGY CONVERSION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2012/002060
Kind Code:
A1
Abstract:
Provided is an R-T-B based rare earth permanent magnet wherein a high coercivity (Hcj) can be achieved without increasing the Dy concentration in an R-T-B based alloy and deterioration in magnetization (Br), said deterioration being caused by the addition of Dy, can be inhibited to thereby give excellent magnetic characteristics. The R-T-B based rare earth permanent magnet comprises a sintered body comprising a primary phase, which contains R2Fe14B as the main component, and a grain boundary phase, which contains R in a larger amount than the primary phase, wherein: R represents a rare earth element containing Nd as an essential element; said sintered body contains Ga as an essential element; said grain boundary phase comprises a primary grain boundary phase, a secondary grain boundary phase and a tertiary grain boundary phase, these grain boundary phases being different in total atomic concentration of rare earth elements from each other; and said tertiary grain boundary phase has a lower total atomic concentration of said rare earth elements than the primary and secondary grain boundary phases, and has a higher atomic concentration of Fe than the primary and secondary grain boundary phases.

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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)
Application Number:
JP2011/061541
Publication Date:
January 05, 2012
Filing Date:
May 19, 2011
Export Citation:
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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)
International Classes:
H01F1/053; B22F1/00; B22F3/24; B22F9/04; C22C33/02; C22C38/00; H01F1/08; H02K15/03
Attorney, Agent or Firm:
SHIGA Masatake et al. (1-9-2, Marunouchi Chiyoda-k, Tokyo 20, 〒1006620, JP)
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Claims:



 
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