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Title:
R-FE-B SINTERED MAGNET AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2018/101239
Kind Code:
A1
Abstract:
This R-Fe-B sintered magnet has a main phase containing R2(Fe, (Co))14B intermetallic compound and a grain boundary phase, and is characterized in that: the inter-particle grain boundary of the grain boundary phase includes an expanded width part that is surrounded by a narrow width part at which the inter-particle width is 10 nm or less and that has a structure distended in the inter-particle width direction as compared with the grain boundary width of the narrow width part; the inter-particle width at the expanded width part is at least 30 nm; Fe/R which is the atomic ratio of Fe with respect to R in the expanded width part is 0.01-2.5; the main phase includes, in the surface part thereof, an HR-rich phase represented by (R', HR)2(Fe, (Co))14B (R' represents one or more elements that are selected from rare-earth elements including Y but excluding Dy, Tb, and Ho, and that essentially include Nd; and HR represents one or more elements selected from among Dy, Tb, and Ho); the contained amount of HR in the HR-rich phase is higher than that in the central part of the main phase. The R-Fe-B sintered magnet according to the present invention has a high magnetic coercive force even when the contained amount of Dy, Tb, and Ho is small.

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Inventors:
OHASHI TETSUYA (JP)
HIROTA KOICHI (JP)
NAKAMURA HAJIME (JP)
Application Number:
PCT/JP2017/042535
Publication Date:
June 07, 2018
Filing Date:
November 28, 2017
Export Citation:
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Assignee:
SHINETSU CHEMICAL CO (JP)
International Classes:
H01F1/057; B22F3/00; B22F3/24; C21D6/00; C22C33/02; C22C38/00; H01F41/02
Domestic Patent References:
WO2015022945A12015-02-19
WO2014157448A12014-10-02
WO2014157451A12014-10-02
Foreign References:
JP2013236071A2013-11-21
JP2014209546A2014-11-06
JP2014130888A2014-07-10
JP2016184720A2016-10-20
JP3997413B22007-10-24
JP2003510467A2003-03-18
JP5572673B22014-08-13
JP2014132628A2014-07-17
JP2014146788A2014-08-14
JP2014209546A2014-11-06
Other References:
See also references of EP 3550576A4
Attorney, Agent or Firm:
PATENT PROFESSIONAL CORPORATION EI-MEI PATENT OFFICE (JP)
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