Fujian Golden Dragon Rare-earth Co., Ltd.

Yan Zhou

Qin Lan

Yao Shi

Hiroshi Nagata

Disclosed are an R—Fe—B-based sintered magnet with a low B content and a preparation method therefor. The sintered magnet comprises the following components: 28.5 wt %-31.5 wt % of R, 0.86 wt %-0.94 wt % of B, 0.2 wt %-1 wt % of Co, 0.2 wt %-0.45 wt % of Cu, 0.3 wt %-0.5 wt % of Ga, 0.02 wt %-0.2 wt % of Ti, and 61 wt %-69.5 wt % of Fe. The sintered magnet has an R-TMseries phase accounting for 75% or more of the total volume of grain boundaries. The present invention selects optimal content ranges of R, B, Co, Cu, Ga, and Ti, and forms an R-TMseries phase of a special composition and increases its volume fraction in grain boundary phases, so as to acquire higher Hcj and SQ values.

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Fujian, China

Yan Zhou