Production method for rare earth permanent magnet
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United States of America Patent
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Nov 27, 2018
Grant Date -
Jul 30, 2015
app pub date -
Aug 30, 2013
filing date -
Aug 31, 2012
priority date (Note) -
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Abstract
A production method for a rare earth permanent magnet, wherein: a sintered magnet body comprising an R1—Fe—B composition (R1 represents one or more elements selected from rare earth elements including Y and Sc) is immersed in an electrodeposition liquid obtained by dispersing a powder containing an R2 oxide (R2 represents one or more elements selected from rare earth elements including Y and Sc) in a solvent; an electrodeposition process is used to coat the powder to the surface of the sintered magnet body; and, in the state in which the powder is present on the surface of the magnet body, the magnet body and the powder are subjected to heat treatment in a vacuum or an inert gas at a temperature equal to or less than the sintering temperature of the magnet.
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