通过球磨工艺增强矫顽力的各向异性 SmFe10V2 块状磁体

Nanomaterials Pub Date : 2024-08-08 DOI:10.3390/nano14161329
Tian Hong Zhou, Baochao Zhang, Xing Zheng, Youngwoon Song, Ping-Zhan Si, Chul-Jin Choi, Young-Rae Cho, Jihoon Park
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引用次数: 0

摘要

成功制备了具有高矫顽力(Hc)的 ThMn12 型 SmFe10V2 各向异性块状磁体。采用球磨工艺制备了不同粒度的粉末,粒度随研磨时间而变化。大尺寸粉末经热处理后压制成的块状材料的 Hc 有所下降,而小尺寸粉末则过度发生严重氧化,导致 SmFe10V2 (1-12) 相分解。由于晶界相的形成,球磨 5 小时的粉末获得了 8.9 kOe 的最高 Hc。各向同性块体的最大能积((BH)max)仅为 2.15 MGOe,为了提高最大能积,使用相同粉末制备了各向异性块体。经 XRD 和 EBSD 测量确认,易排列方向为......。 观察到明显的增强,饱和磁化(Ms)从 59 增至 79 emu/g,剩磁比(Mr/Ms)达到 83.7%。(BH)max 达到 7.85 MGOe。为了进一步提高磁性能,必须控制氧化,以形成均匀的晶界相,并实现小晶粒尺寸的完美排列。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Anisotropic SmFe10V2 Bulk Magnets with Enhanced Coercivity via Ball Milling Process
Anisotropic bulk magnets of ThMn12-type SmFe10V2 with a high coercivity (Hc) were successfully fabricated. Powders with varying particle sizes were prepared using the ball milling process, where the particle size was controlled with milling time. A decrease in Hc occurred in the heat-treated bulk pressed from large-sized powders, while heavy oxidation excessively occurred in small powders, leading to the decomposition of the SmFe10V2 (1–12) phase. The highest Hc of 8.9 kOe was achieved with powders ball-milled for 5 h due to the formation of the grain boundary phase. To improve the maximum energy product ((BH)max), which is only 2.15 MGOe in the isotropic bulk, anisotropic bulks were prepared using the same powders. The easy alignment direction, confirmed by XRD and EBSD measurements, was <002>. Significant enhancements were observed, with saturation magnetization (Ms) increasing from 59 to 79 emu/g and a remanence ratio (Mr/Ms) of 83.7%. (BH)max reaching 7.85 MGOe. For further improvement of magnetic properties, controlling oxidation is essential to form a uniform grain boundary phase and achieve perfect alignment with small grain size.
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