ALLOY MATERIAL FOR R-T-B SYSTEM RARE EARTH PERMANENT MAGNET, METHOD FOR PRODUCING R-T-B SYSTEM RARE EARTH PERMANENT MAGNET, AND MOTOR

Title:

ALLOY MATERIAL FOR R-T-B SYSTEM RARE EARTH PERMANENT MAGNET, METHOD FOR PRODUCING R-T-B SYSTEM RARE EARTH PERMANENT MAGNET, AND MOTOR

Document Type and Number:

WIPO Patent Application WO/2012/043139

Kind Code:

A1

Abstract:

Provided are: an alloy material for an R-T-B system rare earth permanent magnet, which is capable of achieving high orientation rate and high coercivity (Hcj); and a method for producing an R-T-B system rare earth permanent magnet using the alloy material. The alloy material for an R-T-B system rare earth permanent magnet contains a plurality of R-T-B system alloys having different compositions and a metal powder, and each R-T-B system alloy consists of R that is composed of two or more elements selected from among rare earth elements, T that is composed of a transition metal essentially containing Fe, and B and unavoidable impurities. A first alloy, which has the highest Dy content among the plurality of R-T-B system alloys, contains not less than 17% by mass of Dy; and a second alloy, which has the smallest Dy concentration difference with respect to the first alloy among the plurality of R-T-B system alloys, has a Dy concentration difference of not less than 5% by mass with respect to the first alloy.

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Inventors:

NAKAJIMA KENICHIRO (JP)
YAMAZAKI TAKASHI (JP)

Application Number:

PCT/JP2011/070042

Publication Date:

April 05, 2012

Filing Date:

September 02, 2011

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Assignee:

SHOWA DENKO KK (JP)
NAKAJIMA KENICHIRO (JP)
YAMAZAKI TAKASHI (JP)

International Classes:

B22F3/00; B22F1/00; C22C33/02; C22C38/00; H01F1/053; H01F1/08

Domestic Patent References:

WO2005043558A1	2005-05-12
WO2007088718A1	2007-08-09
WO2008032667A1	2008-03-20

Foreign References:

JPS6325904A	1988-02-03
JP2007266199A	2007-10-11
JP2009249729A	2009-10-29
JP4450239B2	2010-04-14
JP2008263243A	2008-10-30
JP4483630B2	2010-06-16

Other References:

SUGIMOTO, POWDER AND POWDER METALLURGY, vol. 57, no. 6, 2010
W. F. LI, ACTA MATERIALIA, vol. 57, 2009, pages 1337 - 1346
MATSUURA: "The Papers of Technical Meeting on Magnetics", vol. MAG-09, 2009, INSTITUTE OF ELECTRICAL ENGINEERS OF JAPAN, pages: 77 - 81
See also references of EP 2623235A4

Attorney, Agent or Firm:

SHIGA Masatake et al. (JP)
Masatake Shiga (JP)

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Claims:

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