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Title:
PERMANENT MAGNET AND ROTATING MACHINE
Document Type and Number:
WIPO Patent Application WO/2018/181580
Kind Code:
A1
Abstract:
Provided are: a permanent magnet that has a large magnetic coercive force among the permanent magnets that contain Ce as a substitutional element for Nd; and a rotating machine equipped with said permanent magnet. This permanent magnet 10 is provided with: a plurality of main phase particles 11 each comprising a rare-earth element R, a transition metal element T, and boron; and a grain boundary phase 9 that is situated between the main phase particles 11, wherein the rare-earth element R includes at least neodymium and cerium, and the transition metal element T includes at least iron, the contained amount of copper in the permanent magnet 10 is 0.1-2 at%, the grain boundary phase 9 includes an R-T phase 3 comprising an intermetallic compound of the rare-earth element R and the transition metal element T, and, when the total contained amount of the rare-earth element R in the R-T phase 3 is [R]L at% and the contained amount of cerium in the R-T phase 3 is [Ce]L at%, 100×[Ce]L/[R]L equals to 75-100.

Inventors:
JINGU NOBUHIRO (JP)
KODA ATSUSHI (JP)
Application Number:
PCT/JP2018/012975
Publication Date:
October 04, 2018
Filing Date:
March 28, 2018
Export Citation:
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Assignee:
TDK CORP (JP)
International Classes:
H01F1/057; B22F3/00; C22C33/02; C22C38/00
Domestic Patent References:
WO2012171490A12012-12-20
Foreign References:
JP2015204390A2015-11-16
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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