RARE EARTH SINTERED MAGNET AND METHOD FOR PRODUCING SAME

Title:

RARE EARTH SINTERED MAGNET AND METHOD FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2007/063969

Kind Code:

A1

Abstract:

Disclosed is a rare earth sintered magnet having a main phase composed of an Nd2Fe14B crystal phase and added with Al. The rare earth sintered magnet contains at least one light rare earth element LR selected from the group consisting of yttrium and rare earth elements other than Dy, Ho and Tb, and at least one heavy rare earth element HR selected from the group consisting of Dy, Ho and Tb. The compositional ratio α1 of the light rare earth elements LR, the compositional ratio α2 of the heavy rare earth elements HR, and the compositional ratio β of Al satisfy the following relations: 25 ≤ α1 + α2 ≤ 40 mass%; 0 <α2 ≤ 40 mass%; β > 0.20 mass%; and 0.04 ≤ β/α2 ≤ 0.12.

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Inventors:

NOZAWA NORIYUKI (JP)
ODAKA TOMOORI (JP)
MATSUURA YUTAKA (JP)

Application Number:

PCT/JP2006/324012

Publication Date:

June 07, 2007

Filing Date:

November 30, 2006

Export Citation:

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Assignee:

NEOMAX CO LTD (JP)
NOZAWA NORIYUKI (JP)
ODAKA TOMOORI (JP)
MATSUURA YUTAKA (JP)

International Classes:

B22D11/06; B22F3/00; B22F3/02; C22C33/02; C22C38/00; H01F1/053; H01F1/08; H01F41/02

Domestic Patent References:

WO2005001856A1

2005-01-06

Foreign References:

JP2005197533A	2005-07-21
JP2003243210A	2003-08-29
JP2000188213A	2000-07-04

Other References: