SINTERED NDFEB RARE EARTH PERMANENT MAGNETIC MATERIAL AND ITS MANUFACTURING METHOD

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A holmium-containing sintered NdFeB rare earth permanent magnetic material and its manufacturing method are provided. The permanent magnet material has the following composition : LnαHoβBγMxNyFe100-α-β-γ-x-y, wherein : Ln is rare earth element, including Nd and at least one element selected from Pr, Dy, Tb; M is additive element, including Co and Cu; N is also additive element, including at least one element from Al, Ga, Nb, Zr, Ti and Sn; α, β, γ, x and y represent the percentage of weight for each element content; Fe indicates Fe element and unavoidable impurities of which; wherein 29≤α≤33, 0.5≤β≤4, 0.95≤γ≤1.20, 0≤x≤3.5, 0≤y ≤1.50. The coercive force Hcj of the magnetic material is evidently increased after having additive Ho.