Method for preparing iron nitride magnetic powder through low-temperature plasma nitriding

一种氮化铁磁粉的低温等离子氮化制备方法

Abstract

The invention relates to a method for preparing iron nitride magnetic powder through low-temperature plasma nitriding. The method comprises the following steps that atomized iron powder, hydroxy iron powder or reduced iron powder of which the average particle size is 2-80 microns is used as a raw material; O2 is introduced, and the raw material is oxidized for 1-10 h at 300-400 DEG C to obtain ferric oxide powder; hydrogen is introduced, the ferric oxide powder is reduced for 4-20 h at 300-400 DEG C to obtain iron powder; the low-temperature plasma nitriding temperature is controlled to 120-200 DEG C, and the low-temperature plasma nitriding time is 1-30 h; and the nitrided iron powder is cooled to room temperature in a furnace, and a sample is taken out. Low-temperature plasma nitriding is conducted, the bottleneck problem that the ammonia dissolving efficiency in the ammonia nitriding method is low is solved, and the nitriding efficiency is effectively improved.
本发明涉及一种氮化铁磁粉的低温等离子氮化制备方法。该发明以平均粒径为2~80μm的雾化铁粉、羟基铁粉或还原铁粉为原材料;通入O2,在300~400℃氧化1‑10h,以获得氧化铁粉;通入氢气,在300~400℃还原4‑20h,以重新获得铁粉;低温等离子氮化,控制温度在120~200℃,氮化1~30h;降温,随炉冷却至室温,取出样品。该方法采用低温氮等离子进行渗氮,解决了氨气渗氮法中氨气分解效率低下的瓶颈问题,有效地提高了渗氮效率。

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