相关实验视频

Updated: Jul 1, 2025

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy

Published on: April 8, 2018

对Ce2Fe14B基烧结磁铁的研究,Ce/RE>80

Dengyue Wang¹, Anhua Li¹, Haibo Feng¹

¹Division of Functional Materials, Central Iron & Steel Research Institute, Beijing, 100081, China.

|March 11, 2024

概括

由于微观结构问题,开发高性能Ce丰富的烧结磁铁具有挑战性. 混合化 (NdH_x) 粉末改善了微观结构和磁性,使富含Ce的永久磁铁应用成为可能.

科学领域:

材料科学材料科学材料科学
金工业是金工业的一个方面.
永久磁铁永久的磁铁永久的磁铁

背景情况:

开发Ce/RE>80%烧结永久磁铁面临着由于微观结构恶化而面临的挑战.
在谷物边界中存在一个四边形的富B相 (fct-RE₅Fe₁₈B₁₈) 破坏了富RE的相连续性.
这一阶段很可能是通过797°C的周热反应形成的,这会对磁铁性能产生负面影响.

研究的目的:

调查微小的 (Nd) 替代在富含Ce的烧结磁体 (Ce/RE>80%) 中的作用.
探索改善这些磁铁的微观结构和磁性特性的方法.
评估大规模利用 (Ce) 在永久磁铁中的可行性.

主要方法:

研究的Ce25.5∼31.5Nd0∼5FebalB1.25M1.15 (wt.%) 是高Ce含量 (Ce/RE>80%) 的烧结磁铁.
在喷气削 (JM) 过程中分析了直接添加Nd的效果与混合NdH_x粉末的效果.
标志着微观结构的演变和磁性 (强制性,残余,最大能量产物).

主要成果:

在高Ce磁体中,直接添加 (3-5%) 并没有显著改善微观结构或强制性.
将2%的NdH_x粉末混合到Ce_27.5Nd₃Fe_balB_1.25M_1.15的结果是统一的粒度边界和富含的外.
获得了优异的磁性:H_cj = 1.714 kOe,B_r = 9.395 kG, (BH) _max = 11.16 MGOe对于Ce_27.5Nd₃+2%的NdH_x磁铁 (Ce=84.5%的RE).

结论:

NdH_x粉末混合是一种有效的策略,可以增强高Ce烧结磁铁的微观结构和磁性.
这种方法促进了统一的谷物边界相位分布和缩,克服了直接添加的局限性.
这些发现支持Ce在永久磁铁中的大规模应用,通过改进工艺/微观结构设计.

关键词:

这是一种Ce-Fe-B磁铁.磁性属性磁性属性微观结构的微观结构阶段构成阶段的组成.

更多相关视频

Author Spotlight: Advancements in High-Performance Thermoelectric Thin Films Through Radio Frequency Magnetron Sputtering

Author Spotlight: Advancements in High-Performance Thermoelectric Thin Films Through Radio Frequency Magnetron Sputtering

Published on: May 17, 2024

Synthesis of Cationized Magnetoferritin for Ultra-fast Magnetization of Cells

Synthesis of Cationized Magnetoferritin for Ultra-fast Magnetization of Cells

Published on: December 13, 2016

相关概念视频

Ferromagnetism

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...