R-T-B-based permanent magnet material, preparation method therefor and use thereof
AssigneeFUJIAN GOLDEN DRAGON RARE-EARTH Co., Ltd.
InventorsQin Lan, Jiaying Huang
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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 comprises R, B, M, Fe, Co, X and inevitable impurities, wherein: (1) R is a rare earth element, and the R includes at least Nd and RH, M being one or more of Ti, Zr and Nb, and X including Cu, “Al and/or Ga”; and (2) in percentage by weight, R: 30.5-32.0 wt %, B: 0.95-0.99 wt %, M: 0.3-0.6 wt %, X: 0.8-1.8 wt %, and Cu: 0.35-0.50 wt %, and the balance is Fe, Co and inevitable impurities. According to the present invention, under the condition of 0.3-0.6 wt % of a high melting point metal, a permanent magnet material with an excellent magnet performance and a good squareness is obtained.
Claims20
An R-T-B-based permanent magnet material, which comprises R, B, M, Fe, Co, X and unavoidable impurities, wherein:
- (1) R is rare earth element and comprises at least Nd and RH;
- RH is heavy rare earth element;
- the content of RH is 0.6-2.0 wt %;
- M is at least one element selected from the group consisting of Ti, Zr and Nb;
- X comprises (a) Cu and Ga, or (b) Cu, Al and Ga;
- (2) in the R-T-B-based permanent magnet material, by mass percentage:
- R:
- 30.5-32.0 wt %;
- B:
- 0.95-0.99 wt %;
- M:
- 0.3-0.6 wt %;
- X:
- 0.8-1.8 wt %, and Cu:
- 0.35-0.50 wt %;
- the balance being Fe, Co and unavoidable impurities;
- wherein, the R-T-B-based permanent magnet material comprises RaMbXcTd phase, wherein, T is Fe and Co, 15 at %<a<25 at %, 2.8 at %<b<4.1 at %, 3.0 at %<c<6.0 at %, 68 at %<d<78 at %, and at % refers to atoms percentage in the RaMbXcTd phase.
Dependencies are inferred from the claim text.