Microstructure and magnetic properties of surfactant-assisted ball milling NdFe8Co2Mo2 powders and their nitrides

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Magnetism and Magnetic Materials Pub Date : 2024-10-05 DOI:10.1016/j.jmmm.2024.172581

Hongyao Mi , Xiaoyong Feng , Minghe Zhang , Yunli Feng , Kun Liu , Shuai Wang

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Abstract

The NdFe₈Co₂Mo₂ alloy ribbons were prepared by melt-spinning. The powder was prepared through surfactant-assisted ball milling, followed by nitriding to produce the NdFe₈Co₂Mo₂N_x alloy. The alloy ribbons grain size decreases as the copper roller speed increases. At the speed of 30 m/s, a pure 1:12 phase alloy ribbons were produced. The grain size decreases with increasing the ball milling time, but the composition phases almost unchanged of the alloy powder. The grain size refine after nitriding, but the grain volume expands when the nitriding temperature exceeds 500 °C. With increasing ball milling time and nitriding temperature, the remanence (M_r) and coercivity (H_c) of the alloy powder increase first and then decrease. The alloy powder obtained from ball milling for 3 h after nitriding at 475 ℃ for 3 h, resulting in M_r was 44.43 Am²/kg, H_c was 0.434 T, and saturation magnetization (M_s) was 74.89 Am²/kg.

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表面活性剂辅助球磨钕铁硼粉末及其氮化物的微观结构和磁性能

钕铁硼钴2Mo2合金带是通过熔融纺丝制备的。通过表面活性剂辅助球磨制备粉末，然后进行氮化处理，制备出 NdFe8Co2Mo2Nx 合金。合金带的晶粒尺寸随着铜辊速度的增加而减小。在 30 米/秒的速度下，可制得纯度为 1:12 的相合金带。晶粒尺寸随球磨时间的增加而减小，但合金粉末的组成相几乎没有变化。氮化后晶粒细化，但氮化温度超过 500 ℃ 时晶粒体积膨胀。随着球磨时间和氮化温度的增加，合金粉的剩磁（Mr）和矫顽力（Hc）先增大后减小。在 475 ℃ 下氮化 3 小时后，球磨 3 小时得到的合金粉末的剩磁（Mr）为 44.43 Am2/kg，矫顽力（Hc）为 0.434 T，饱和磁化（Ms）为 74.89 Am2/kg。

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.