SINTERED NEODYMIUM MAGNET

World Intellectual Property Organization Patent

APP PUB NO WO-2013100010-A1
SERIAL NO

PCTJP2012083788

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Abstract

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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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Patent Owner(s)

Patent OwnerAddress
INTERMETALLICS CO LTDJP1-36 GORYO OHARA NISHIKYO-KU KYOTO-SHI KYOTO 6158245 ?6158245

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Inventor(s)

Inventor Name Address
SAGAWA MASATO KYOTO
MIZOGUCHI TETSUHIKO KYOTO

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