Abstract

The effect of the mechanical milling of Sm₂Fe₁₇N₃ nitride in a vibratory mill, in particular, the effect of the powder-to-ball mass ratio (m), milling time (t_mill), milling medium, and concentration of added surfactants, has been systematically studied in order to determine optimum parameters for the high level of hysteresis properties of the magnetically anisotropic powder. It is shown that, as m increases from 15 to 50, the increase in the coercivity H_c of the powder at the beginning milling stages (t_mill ≤ 4 h) is substantially accelerated; in this case, about 80% particles are less than 1 µm in size. As the milling time increases (t_mill > 4 h), the coercivity continues to increase. However, the specific residual magnetization σ_r and maximum energy product (BH)_max begin to decrease because of the developed process of particle agglomeration, which results in a deterioration of the powder allignment. The addition of a surfactant to the protective medium markedly intensifies the milling process and accelerates the kinetics of the increase of H_c at the beginning milling stages at m = 15. The best complex of magnetic hysteresis properties, σ_r ≥ 135 emu/g, H_c, ≥ 8 kOe, and (BH)_max ≥ 18 MG Oe, is observed for powders milled in 5% solution of oleic acid in acetone, 5% solution of capronic acid in toluene, and 1% solution of methyl caproate in toluene.

中文翻译：

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通过添加表面活性剂的机械研磨增强 Sm2Fe17N3 粉末的矫顽力

摘要

Sm ₂ Fe ₁₇ N ₃氮化物在振动磨机中机械研磨的效果，特别是粉球质量比（m）、研磨时间（t _mill）、研磨介质和浓度的影响已经系统地研究了添加的表面活性剂，以确定磁各向异性粉末高水平磁滞特性的最佳参数。结果表明，随着m从 15 增加到 50，开始研磨阶段的粉末矫顽力H _c增加（t _mill≤ 4 h) 显着加速；在这种情况下，大约 80% 的颗粒尺寸小于 1 µm。随着研磨时间的增加（t _mill > 4 h），矫顽力继续增加。然而，由于颗粒团聚过程的发展，比剩磁σ _r和最大能积（BH）_max开始下降，导致粉末排列的恶化。在保护介质中添加表面活性剂显着加强了研磨过程，并在m  = 15的开始研磨阶段加速了H _c增加的动力学。磁滞性能的最佳复合物，σ _r对于在 5% 油酸丙酮溶液、5% 己酸甲苯溶液和 1% 丙酮溶液中研磨的粉末，观察到≥ 135 emu/g、H _c、≥ 8 kOe 和 ( BH ) _max ≥ 18 MG Oe己酸甲酯的甲苯溶液。