Preparation of rare earth permanent magnet material
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United States of America Patent
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Jul 3, 2012
Grant Date -
Oct 9, 2008
app pub date -
Mar 22, 2005
filing date -
Oct 19, 2004
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Abstract
A method for preparing a rare earth permanent magnet material comprising the steps of:
- disposing a powder comprising one or more members selected from an oxide of R2, a fluoride of R3, and an oxyfluoride of R4 wherein R2, R3 and R4 each are one or more elements selected from among rare earth elements inclusive of Y and Sc on a sintered magnet form of a R1—Fe—B composition wherein R1 is one or more elements selected from among rare earth elements inclusive of Y and Sc, andheat treating the magnet form and the powder at a temperature equal to or below the sintering temperature of the magnet in vacuum or in an inert gas.
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