不同类型的SmFe10V2 通过球磨工艺增强强制性的散装磁铁
Tian Hong Zhou1,2, Baochao Zhang1, Xing Zheng1
1Nano Materials Research Division, Korea Institute of Materials Science, Changwon 51508, Republic of Korea.
Nanomaterials (Basel, Switzerland)
|August 28, 2024
概括
研究人员制造了异构的ThMn12类型SmFe10V2磁铁. 最佳的球磨时间产生了高强制性和改善的磁性,突出了受控氧化和谷物边界形成的重要性.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 磁力学 磁力学 是一种
背景情况:
- 高性能永久磁铁对于先进技术至关重要.
- ThMn12类型的SmFe10V2化合物为没有稀土的磁铁提供了潜力.
- 为了达到最佳的磁性,需要对微观结构和加工进行仔细控制.
研究的目的:
- 为了制造异构的ThMn12类型SmFe10V2散装磁铁.
- 为了研究球磨时间和颗粒大小对磁性特性的影响.
- 通过磁对齐来增强最大能量产物 ((BH) max).
主要方法:
- 通过控制磨时间的球磨粉末制备.
- 通过压制和热处理制造散装磁铁.
- 使用X射线衍射 (XRD) 和电子反射衍射 (EBSD) 进行结构和晶体分析的表征.
- 磁性性能测量包括强制性 (Hc),和磁化 (Ms),残留 (Mr) 和最大能量产物 ((BH) max).
主要成果:
- 成功制造了具有高强制性的无otropic SmFe10V2磁铁.
- 经过5小时的球磨,由于谷物边界阶段形成,产生了最高的强制性 (8.9kOe).
- 不同类型的散装体表现出显著的改善:Ms从59增加到79emu/g,残留率 (Mr/Ms) 达到83.7%, (BH) max改善到7.85MGOe.
- 氧化控制至关重要;小粉末的过度氧化导致了阶段分解,而大粉末在热处理后的强制性降低.
结论:
- 优化球磨和控制加工对于高性能SmFe10V2磁铁至关重要.
- 沿着<002>方向的异型对齐显著增强了磁性.
- 控制氧化和实现统一的粒边界相对于进一步提高磁性性能至关重要.
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