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研究了烧结Ｎｄ－Ｆｅ－Ｂ磁体制作过程中从原材料、熔炼、粗破碎、气流磨、压型一直到烧结的各个环节中磁粉／体中氧含量的变化情况。观察到：在带筛球磨到气流磨过程中，氧含量增加最为剧烈；在压型阶段氧含量达到最高值，而在烧结过程中磁体氧含量并没有明显增加。ＳＥＭ 背散射和能谱测量说明，高氧浓度的磁体中，氧化物以及因主相分解生成的α－Ｆｅ 等软磁性相是造成磁体磁性能恶化的主要原因
The changes of oxygen content in the magnetic powder / body during the production of the sintered Nd-Fe-B magnet from raw material, smelting, coarse crushing, jet milling and pressure forming to sintering were studied. It is observed that the oxygen content increases most sharply during the process of sieve-mill to air-jet milling, and the oxygen content reaches the highest value during the pressing stage, while the oxygen content of the magnet does not increase significantly during the sintering process. SEM backscattering and energy spectrum measurements show that the main reason for the deterioration of the magnetic properties of the magnet is the oxide and the soft magnetic phase such as α-Fe generated by the decomposition of the main phase among the high oxygen concentration magnets