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使用氢气还原氯化法，以针状α－FeOOH为原料制备了超细针状γ′－Fe4N磁粉。并且研究了工艺条件对γ′－Fe4N超细磁粉生成的影响。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=0.45是生成γ′－Fe4N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。通过表面氧化可以提高γ′－Fe4N磁粉的稳定性。
Using hydrogen reduction chlorination method, needle-shaped α-FeOOH as raw material prepared needle-shaped γ’-Fe4N magnetic powder. The effects of technological conditions on the formation of γ’-Fe4N 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 = 0.45 is the best reaction conditions for the formation of γ’-Fe4N. Using appropriate heat treatment and reduction nitriding process can prevent the particles from breaking, spheroidizing and sintering. Through the surface oxidation can improve the stability of γ’-Fe4N magnetic particles.