MODIFIED SINTERED Nd-Fe-B MAGNET, AND PREPARATION METHOD AND USE THEREOF

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To provide a modified sintered Nd-Fe-B magnet in which the used amount of a heavy rare earth element can be reduced and cost can be also reduced significantly while coercivity of the magnet is improved, and a preparation method thereof.SOLUTION : A modified sintered Nd-Fe-B magnet is prepared by performing grain boundary diffusion on a matrix. The matrix is a sintered Nd-Fe-B magnet, and a grain boundary diffusion source includes a first diffusion source and a second diffusion source. The first diffusion source is a PrMx alloy, M being at least one selected from among Cu, Al, Zn, Mg, Ga, Sn, Ag, Pb, Bi, Ni, Nb, Mn, Co, Fe, Ti, Cr, Zr, Mo and Ge, and the second diffusion source is heavy rare earth Dy and/or Tb. A wider and longer diffusion channel formed by a low-melting-point alloy containing Pr preferentially entering the inside of the magnet is used as a channel for rapid diffusion of a heavy rare earth element, such that the diffusion depth and rate of the heavy rare earth element and coercivity of the magnet are further increased and manufacturing cost can be also reduced.SELECTED DRAWING : None