Nd based sintered magnet

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United States of America Patent

PATENT NO 9953750
SERIAL NO

14187573

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Abstract

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A sintered Nd base magnet segment has a coercive force high at the periphery and lower toward the inside. A method for preparing the magnet includes the steps of: (a) providing a sintered Nd base magnet block having surfaces and a magnetization direction, (b) coating the surfaces of the magnet block excluding the surface perpendicular to the magnetization direction with a Dy or Tb oxide powder, a Dy or Tb fluoride powder, or a Dy or Tb-containing alloy powder, (c) treating the coated block at a high temperature for causing Dy or Tb to diffuse into the block, and (d) cutting the block in a plane perpendicular to the magnetization direction into a magnet segment having a coercive force distribution on the cut section that the coercive force is high at the periphery and lower toward the inside and a constant coercive force distribution in the magnetization direction.

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Patent Owner(s)

Patent OwnerAddress
SHIN-ETSU CHEMICAL CO LTDTOKYO

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hirota, Koichi Echizen, JP 103 1054
Honshima, Masakatsu Echizen, JP 3 53
Minowa, Takehisa Echizen, JP 140 1510
Miyata, Koji Echizen, JP 111 1780
Nakamura, Hajime Echizen, JP 164 2612

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