R-T-B BASED PERMANENT MAGNET

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PROBLEM TO BE SOLVED : To provide an R-T-B based permanent magnet showing high residual magnetic flux density Br and coercive force HcJ. SOLUTION : There is provided an R-T-B based permanent magnet in which, R is a rare earth element, T is an element other than a rare earth element, B, C, O or N, and B is boron. R at least includes Tb, and T at least includes Fe, Cu, Co and Ga. A total of R content is 28.05-30.60 mass%, Cu content is 0.04-0.50 mass%, Co content is 0.5-3.0 mass%, Ga content is 0.08-0.30 mass%, and B content is 0.85-0.95 mass%, relative to 100 mass% of a total mass of R, T and B. The R-T-B based permanent magnet shows a concentration distribution in which Tb concentration reduces from the outside to the inside of the R-T-B based permanent magnet. SELECTED DRAWING : Figure 1 COPYRIGHT : (C)2018, JPO&INPIT