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Abstract

A method for preparing an R—Fe—B based sintered magnet. The method includes: 1) preparing a R¹—Fe—B-M alloy, pulverizing the R¹—Fe—B-M alloy to yield a R¹—Fe—B-M alloy powder, adding a heavy rare earth powder of R² or R²X and subsequently adding a lubricant to the R¹—Fe—B-M alloy powder and uniformly stirring to form a mixture, where R¹ being Nd, Pr, Tb, Dy, La, Gd, Ho, or a mixture thereof; M being Ti, V, Cr, Mn, Co, Ga, Cu, Si, Al, Zr, Nb, W, Mo, or a mixture thereof; R² being at least one from Tb, Dy, and Ho; X being at least one from O, F, and Cl; 2) pressing the mixture obtained in step 1) to form a compact, and sintering the compact in a pressure sintering device in vacuum or in an inactive gas atmosphere to obtain a magnet; and 3) aging the magnet obtained in step 2).

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