| abstract |
The invention discloses an R-Fe-B sintered magnet with low B content and a preparation method thereof, comprising the following components: 28.5wt%-31.5wt% R, 0.86wt%-0.94wt% B, 0.2wt% ‑1wt% Co, 0.2wt%‑0.45wt% Cu, 0.3wt%‑0.5wt% Ga, 0.02wt%‑0.2wt% Ti, and 61wt%‑69.5wt% Fe, the sintered magnet It has R 6 -T 13-δ M 1+δ -based phase accounting for more than 75% of the total volume of grain boundaries. It selects the content of R, B, Co, Cu, Ga and Ti in the optimal range, and obtains by forming a special composition of R 6 -T 13-δ M 1+δ phase and increasing its volume ratio in the grain boundary phase. Higher Hcj and SQ values. |