NEODYMIUM-IRON-BORON PERMANENT MAGNET MATERIAL, RAW MATERIAL COMPOSITION THEREFOR AND PREPARATION M

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Disclosed are a neodymium-iron-boron permanent magnet material, a raw material composition therefor and a preparation method therefor. The raw material composition for preparing the neodymium-iron-boron permanent magnet material comprises the following components : R : 30.2-31.7 mass%, R being a rare earth element; Nb : <0.25 mas% and not 0; Cu : 0.35-0.5 mass%; Al : 0-0.2 mass%; B : 0.92-0.96 mass%; and Fe : 60- 70 mass%. The sum of the components is 100 mass%, R comprises heavy rare earth metal RH, and RH comprises Dy and/or Tb. The square degree of the neodymium-iron-boron permanent magnet material prepared from the raw material composition is 99% or above; the absolute value of the temperature coefficient of Hcj at 20-150°C is 0.404% to 0.414%; the heat treatment temperature range is 470-510°C; Br ≥ 14 kGs, and the coercive force ≥ 25 kOe.