Patent ID: 7255751

Claim:
A method for manufacturing an R-T-B system rare earth permanent magnet comprising a sintered body with a composition consisting essentially of 25% to 35% by weight of R (wherein R represents one or more rare earth elements, providing that the rare earth elements include Y), 0.5% to 4.5% by weight of B, 0.02% to 0.6% by weight of Al and/or Cu, 0.03% to 0.25% by weight of Zr, 4% or less by weight (excluding 0) of Co, and the balance substantially being Fe, said manufacturing method comprising the steps of: manufacturing a compacted body containing a low R alloy containing a R 2 T 14 B compound as a main constituent and Zr, and a high R alloy containing, as main constituents, R and T (wherein T represents at least one transition metal element essentially containing Fe, or Fe and Co), wherein said high R alloy contains a higher amount of R than said low R alloy; and sintering the compacted body.