METHOD AND APPARATUS FOR MANUFACTURING AN R-FE-B SINTERED MAGNET

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The present invention provides a method for preparing R-T-B sintered magnets. The method comprises the steps of : Introducing a carrier gas, a reactive gas, and a cooling gas into a plasma torch gun (1) and passing a Dy and/or Tb powder driven by the carrier gas through the plasma torch gun (1) thereby heating and melting the Dy and/or Tb powder under the action of high temperature of the plasma torch to generate spherical droplets which are deposited as a metal film on a surface of an R-T-B-M sintered basal diffusion magnet of RTB type, wherein R is at least one element selected from the rare earth elements including Sc and Y, T is at least one element selected from Fe and Co, B is boron, and M is at least one element selected from Ti, Zr, Hf, V, Nb, Ta, Mn, Ni, Cu, Ag, Zn, Zr, Al, Ga, In, C, Si, Ge, Sn, Pb, N, P, Bi, S, Sb, and O, and wherein a weight percentage of said elements is : 25% ≤ R ≤ 40%, 0 ≤ M ≤ 4%, 0.8% ≤ B ≤ 1.5%, and the residue is T.