为了获得高矫顽力的Sm2Fe17N3磁粉,对平均粒径为2.5 μm的商用Sm2Fe17N3磁粉进行0~60 min高能球磨,研究球磨时间对Sm2Fe17N3磁粉结构与磁性能的影响。结果表明,随球磨时间延长,Sm2Fe17N3粉体的矫顽力先增大后减小,球磨时间为12 min时,Sm2Fe17N3相晶粒尺寸从原始粉末的40.8 nm减小至31.8 nm,粉体具有最高矫顽力,为875.6 kA/m,且磁粉仍保持磁各向异性。球磨时间为30 min时,虽然晶粒尺寸进一步减小,但Sm2Fe17N3分解生成SmN和α-Fe等软磁相,导致磁粉的矫顽力降低,球磨时间为60 min的磁粉矫顽力仅为477.6 kA/m。本研究制备的Sm2Fe17N3粉体可作为高性能Sm2Fe17N3黏结磁体的优质原料粉末。
Sm2Fe17N3 magnetic powders were prepared by high-energy ball milling. The effects of ball milling times on the magnetic properties and microstructure of Sm2Fe17N3 magnetic powders were studied. The results show that the coercivity of Sm2Fe17N3 powders increases first and then decreases with the milling time increases from 0 min to 60 min. When the milling time is 12 min, the grain size of Sm2Fe17N3 phase decreases from 40.8 nm of the original powder to 31.8 nm. The powder has the highest coercivity of 875.6 kA/m, and the magnetic powder still maintains anisotropy. However, when the ball milling time is 30 mins, although the grain size is further reduced, the Sm2Fe17N3 decomposes to form soft magnetic phases such as SmN and α-Fe, resulting in a decrease in the coercivity of the magnet. When the milling time is 60 min, the coercivity of magnetic powders decreases to 477.6 kA/m. This work provides an effective way for the preparation of high-quality Sm2Fe17N3 powder precursors for the preparation of high-performance Sm2Fe17N3 bonded magnets.
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