MODIFIED SINTERED NEODYMIUM-IRON-BORON PERMANENT MAGNET MATERIAL AND PREPARATION METHOD THEREFOR

The disclosure provides a modified sintered neodymium-iron-boron permanent magnetic material and a preparation method therefor. The modified sintered neodymium-iron-boron permanent magnetic material includes a first alloy, the first alloy represented by formula (I): (Pr0.25Nd0.75)a(LRE)bTMcFe100%-a-b-c-dBd (I), where LRE is a rare earth element, selected from one or more of elements Gd, Y, and Ce, and at least includes the element Gd, TM is selected from one or more of elements Al, Cu, Co, Ga, Nb, Zr, and Ti, a is 5% to 20%, b is 13% to 28%, c is 0.4% to 5.5%, and d is 0.9% to 1%. The modified sintered neodymium-iron-boron permanent magnetic material provided by the disclosure has a maximum magnetic energy product of 5MGOe to 30MGOe, residual magnetism of 6kGs to 11kGs, and an intrinsic coercive force of 5kOe to 11kOe, and is excellent in high-temperature resistance and low in cost.