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使用氧气还原氮化法，以针状α－ＦｅＯＯＨ为原料制备了超细针状－Ｆｅ３Ｎ磁粉。并且研 究了工艺条件对－Ｆｅ３Ｎ超细磁粉生成的影响及－Ｆｅ３Ｎ超细磁粉的稳定性。实验结果表明，氨 气与氢气的比例是影响磁粉生成的关键因素。氢气／氨气＝０．２７是生成－Ｆｅ３Ｎ最佳反应条件。 采用合适的热处理工艺和还原氮化过程可以防止颗粒断裂、球化和烧结。通过表面氧化处理的方 法可以提高针状－Ｆｅ３Ｎ超细磁粉的耐蚀性。
Using oxygen reduction nitridation method, needle-shaped α-FeOOH as raw material prepared fine needle -Fe3N magnetic powder. The effect of process conditions on the formation of -Fe3N ultrafine magnetic powder and the stability of Fe3N ultrafine magnetic powder were also studied. The experimental results show that the ratio of ammonia to hydrogen is the key factor that affects the magnetic powder formation. Hydrogen / ammonia = 0.27 is the best reaction to generate-Fe3N. Using appropriate heat treatment and reduction nitriding process can prevent the particles from breaking, spheroidizing and sintering. Corrosion resistance of needle -Fe3N ultrafine magnetic powder can be improved by surface oxidation treatment.