R-T-B permanent magnet material and preparation method therefor and use thereof

Abstract

An R-T-B permanent magnet material and a preparation method therefor and a use thereof. The R-T-B permanent magnet material comprises the following components: R′, which is between 29.5 wt. % and 33.0 wt. %, the R comprising R, Pr, and Nd, R being a rare earth element other than Pr and Nd, the Pr content being greater than or equal to 8.85 wt. %, the mass ratio of Nd to R′ being less than 0.5; N, which is greater than 0.05 wt. %, and less than or equal to 4.1 wt. %, the N being Ti, Zr, or Nb; B, which is between 0.90 wt. % and 1.2 wt. %; and Fe, which is between 62.0 wt. % and 68.0 wt. %. A sintered permanent magnet product having a high coercive force and a stable temperature coefficient is prepared by using a formulation having a high Pr content. The described formulation can maximally exert the advantage of Pr, and effectively reduce production costs.

Dependencies are inferred from the claim text.