R-T-B-based permanent magnet material, preparation method therefor and use thereof
AssigneeFUJIAN GOLDEN DRAGON RARE-EARTH Co., Ltd.
InventorsQin Lan, Jiaying Huang, Dakun Chen
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Abstract
Disclosed are an R-T-B-based permanent magnet material, a preparation method therefor and the use thereof. The R-T-B-based permanent magnet material I comprises the following components: 29.0-32.5% of R including RH, 0.30 to 0.50 wt. % of Cu, 0.05 to 0.20 wt. % of Ti, 0.85 to 1.05 wt. % of B, 0.1 to 0.3 wt. % of C, 66 to 68 wt. % of Fe, wherein R is a rare earth element and R at least includes Nd; and RH is a heavy rare earth element and RH at least includes Tb or Dy, A Cu—Ti—C grain boundary phase is formed in the R-T-B-based permanent magnet material I, and Hcj is significantly improved.
Claims3
An R-T-B-based permanent magnet material I, wherein, the R-T-B-based permanent magnet material I consists of the following components by mass percentage:
- 29.0-32.5 wt. % of R;
- 0.30-0.50 wt. % of Cu;
- 0.05-0.20 wt. % of Ti;
- 0.85-1.05 wt. % of B;
- 0.1-0.3 wt. % of C;
- 0.2-0.5 wt. % of Ga;
- 0-0.15 wt. % of O, but not 0;
- 0.5-1.5 wt. % of Co;
- 66-68 wt. % of Fe, wt. % refers to the mass percentage in the R-T-B-based permanent magnet material I;
- R is a rare earth element, and the R consists of RH, Pr and Nd;
- RH is a heavy rare earth element, and RH is Tb, Dy or a combination of Tb and Dy;
- the content of RH is 0.5-1.2 wt. %;
- the R-T-B-based permanent magnet material I has Cu—Ti—C grain boundary phase at the grain boundary of the magnet, which is formed in grain boundary diffusion process.
Dependencies are inferred from the claim text.