| 摘要 |
It is an object of the present invention to obtain a highly coercive R-T-B system sintered magnet by making the crystal microstructure of a raw material alloy prepared by strip casting more uniform, thereby making the crushed powder obtained from such raw material alloy more fine and making the size distribution more narrow. The present invention provides a raw material alloy for an R-T-B system sintered magnet containing grains of an R<SUB>2</SUB>T<SUB>14</SUB>B compound, wherein a P and/or S content is between 100 and 950 ppm. This raw material alloy preferably has a composition comprising 25 to 35% by weight of R, 0.5 to 4% by weight of B, 0.02 to 0.6% of one or both of Al and Cu, 5% by weight or less of Co, and the balance of Fe.
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