METHOD AND DEVICE FOR PREPARING A SINTERED Nd-Fe-B PERMANENT MAGNET

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The present invention is directed to a method for preparing a permanent magnet, and more specifically, to a method for preparing a high-performance sintered Nd—Fe—B permanent magnet, in order to solve the problems of increased brittleness or high cost present in the permanent magnet prepared by the existing process. A method for preparing a sintered Nd—Fe—B permanent magnet includes the following steps : (1) ingredient calculation and raw material preparation in which calculating ingredients and preparing raw materials according to the ingredient formula of the resultantly sintered Nd—Fe—B permanent magnet in mass fraction, i.e., (NdA−XREX)A(Febal−yMy)balB0.95˜1.03, in which A %+(0.95˜4.03)%+bal %=100%; then dividing the raw materials into a rare earth Fe—B compound and rare earth metals, the formula of the rare earth Fe—B compound in mass fraction being (Nd28−aREa)28(Febal−yMy)balB0.95˜1.03 and that of the rare earth metals being (NdA−28−bREb)A−28.