Patent ID: 8012269

Claim:
A rare earth permanent magnet material consists essentially of, in % by weight: 27 to 33% of R, wherein R is at least one element selected from the group consisting of Nd, Pr, Dy, Tb, and Ho, including 15 to 33% by weight of Nd, 0.1 to 10% of Co, 0.8 to 1.5% of B, 0.05 to 1.0% of Al, 0.02 to 1.0% of Cu, 0.02 to 1.0% of an element selected from Ti, Zr and Hf, 0.123 to 0.3% of C, 0.04 to 0.4% of O, 0.002 to 0.1% of N, and the balance of Fe and incidental impurities, wherein (i) at least two compounds selected from the group consisting of an M-B based compound, an M-B—Cu based compound, and an M-C based compound, wherein M is at least one metal selected from the group consisting of Ti, Zr, and Hf, and (ii) an R oxide have precipitated within the alloy, and the precipitated compounds have an average grain size of up to 5 μm and are distributed in the alloy at a maximum interval of up to 50 μm between adjacent precipitated compounds.