RARE EARTH SINTERED MAGNET, METHOD OF MANUFACTURING RARE EARTH SINTERED MAGNET, ROTOR, AND ROTATING MACHINE
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United States of America Patent
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Nov 23, 2023
app pub date -
Oct 29, 2020
filing date -
Oct 29, 2020
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Abstract
A rare earth sintered magnet includes a plurality of regions of a main phase each having an R2Fe14B crystal structure containing at least Nd as a rare earth element R and a grain boundary phase formed among the plurality of regions of the main phase. The grain boundary phase has Sm enriched portions in which Sm is enriched by Sm substitution in a crystalline NdO phase and heavy rare earth element RH enriched portions in which a heavy rare earth element RH is enriched at least on part of peripheries of the Sm enriched portions. This allows the heavy rare earth element RH to diffuse deeper into the rare earth sintered magnet while suppressing the deterioration of the magnetic properties.
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