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在热压加工过程中,压力对Ce替代的Nd-Fe-B热变形磁铁的影响

Ye Ryeong Jang¹, Wonjin Kim¹, Sumin Kim²

¹Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea.

Materials (Basel, Switzerland)

|August 10, 2024

概括

优化热压压的压力是提高替代铁 (Nd-Fe-B) 磁铁的磁性特性的关键. 在热压过程中,200MPa的压力在这些Ce替代的Nd-Fe-B磁铁中产生了优越的磁性性能.

科学领域:

材料科学材料科学材料科学
磁力学磁力学是一种
固态物理固态物理

背景情况:

铁 (Nd-Fe-B) 磁铁对于高性能应用非常重要.
(Ce) 替代提供了一个成本效益高的替代新 (Nd) 的替代方案.
优化加工对于最大限度地提高Ce替代Nd-Fe-B磁铁的磁性属性至关重要.

研究的目的:

为了研究热压压力对Ce替代Nd-Fe-B热变形磁铁的微观结构和磁性质的影响.
为了确定最佳的热压条件,以提高磁性性能.
了解前体微观结构与最终磁性特性之间的关系.

主要方法:

用热压在不同压力 (100-300MPa) 后进行热变形的方法制造Cee替代的Nd-Fe-B磁铁.
微结构分析以检查粒度对齐,密度和相位分布.
测量磁性属性,包括强制性 (Hci),残留 (Br) 和最大能量产物 ((BH) max).

主要成果:

在200MPa的热压后进行热变形,可以获得最佳的磁性特性:Hci = 8.9 kOe,Br = 12.2 kG,和 (BH) max = 31 MGOe用于40%的Ce替代磁体.
较低的压力 (100MPa) 导致高孔隙性和较差的磁性.
较高的压力 (300 MPa) 导致谷物粗和不良的二次相形成 (REFe2),破坏了质地.
合适的热压压力确保了均的富含RE的相分布和增强的粒度对齐.

结论:

优化热压压力对于实现Ce替代的Nd-Fe-B磁铁的优异磁性至关重要.
在热挤压过程中200MPa的压力提供了一个理想的前体微结构,用于增强粒度对齐和磁性性能.
这项研究提供了一种生产高性能热变形磁铁的战略,其中含有大量Ce的磁铁.

关键词:

有Ce替代磁铁的磁铁.Nd-Fe-B 永久磁铁的使用情况热变形的磁铁热变形的磁铁微观结构的微观结构

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