Patent ID: 6648984
Filing Date: 2003-11-18
Classification: H01F

Abstract:
A method for manufacturing Râ€”Feâ€”B rare earth magnets, comprising the steps of:preparing alloy powder for Râ€”Feâ€”B rare earth magnets including particles having a size in a range of about 2.0 &mgr;m to about 5.0 &mgr;m as measured by a light scattering method using a Fraunhofer forward scattering in a proportion of approximately 45 vol. % or more and particles having a size larger than about 10 &mgr;m in a proportion of less than approximately 1 vol. %: compacting said powder to produce a compact; and sintering said compact; wherein in the step of sintering, a sintered magnet having an average crystal grain size in a range of about 5 &mgr;m to about 7.5 &mgr;m is produced.