Title:
RARE EARTH MAGNET, AND METHOD FOR MANUFACTURING RARE EARTH MAGNET
Document Type and Number:
Japanese Patent JP2015220335
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide: a rare earth magnet having a high residual magnetic flux density and a high coercive force; and a method for manufacturing such a rare earth magnet.SOLUTION: A rare earth magnet is manufactured by hot plastic working on an R-Fe-B based alloy including a rare earth element R, Fe and B. The rare earth magnet has a composition including 32-37 mass% of R and 1.1-1.5 mass% of B. The rare earth magnet has a structure including main phases 11 of an RFeB compound, and grain boundary phases which are present at crystal grain boundaries of the main phase and higher than the main phase in R concentration. In the rare earth magnet, the main phases have an average crystal grain diameter of 500 nm or less; the residual magnetic flux density Br is 1.15 T or larger; and the coercive force iHc is 1200 kA/m or larger.
Inventors:
MAEDA TORU
MINAGAWA MAKOTO
SUGIMOTO SATOSHI
MINAGAWA MAKOTO
SUGIMOTO SATOSHI
Application Number:
JP2014102746A
Publication Date:
December 07, 2015
Filing Date:
May 16, 2014
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES
International Classes:
H01F1/057; B22F1/00; B22F3/00; B22F3/02; B22F3/20; C22C38/00; H01F1/08; H01F41/02
Attorney, Agent or Firm:
Hiroshi Yamano
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