SINTERED NEODYMIUM MAGNET - INTERMETALLICS CO LTD

Title:

SINTERED NEODYMIUM MAGNET

Document Type and Number:

WIPO Patent Application WO/2013/100010

Kind Code:

A1

Abstract:

Provided is a sintered neodymium magnet that is manufactured using a grain-boundary diffusion process, has high coercivity and squareness ratio, and exhibits little in the way of decreases in maximum energy product. This sintered neodymium magnet is obtained as follows: dysprosium and/or terbium (hereinafter "dysprosium and/or terbium" is referred to as "RH") attached to the surface of a substrate manufactured by aligning and sintering a powdered NdFeB alloy is diffused along grain boundaries inside said substrate by means of a grain-boundary diffusion process. This sintered neodymium magnet is characterized in that the difference (Cs - Cd3) between the RH concentration (Cs) (wt.%) along grain boundaries at the surface to which RH was attached and the RH concentration (Cd3) (wt.%) along grain boundaries at a depth of 3 mm from said surface is no more than 20 wt.%.

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Inventors:

SAGAWA MASATO (JP)
MIZOGUCHI TETSUHIKO (JP)

Application Number:

PCT/JP2012/083788

Publication Date:

July 04, 2013

Filing Date:

December 27, 2012

Export Citation:

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Assignee:

INTERMETALLICS CO LTD (JP)

International Classes:

H01F1/08; B22F1/00; B22F3/00; C22C33/02; H01F1/057; H01F41/02

Domestic Patent References:

WO2011004894A1	2011-01-13
WO2007088718A1	2007-08-09
WO2009004794A1	2009-01-08
WO2010109760A1	2010-09-30
WO2006043348A1	2006-04-27
WO2011004894A1	2011-01-13

Other References: