Extrusion compression molded critical rare earth free bonded permanent magnets

IF 3 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materialia Pub Date : 2025-02-04 DOI:10.1016/j.mtla.2025.102359

Mariappan Parans Paranthaman , Harshida Parmar , Kaustubh Mungale , James W. Kemp , Haobo Wang , Ikenna C. Nlebedim , Uday Kumar Vaidya

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Abstract

Samarium iron nitride (Sm-Fe-N) bonded magnets have emerged as promising candidates for various industrial applications due to their exceptional magnetic properties. Compounds with magnetic material 95 wt fraction (wt.%) (∼74 vol%) and 97 wt.% (∼81 vol%) of SmFeN in a polyamide (PA12) polymer binder are manufactured using a batch mixer followed by compression molding. A maximum energy product (BH)_max of 186.21 kJ.m^-3 (23.4 MGOe) is achieved in the 95 wt.% bonded magnets; 97 wt.% magnets had a (BH)_max of 165.52 kJ.m^-3 (20.8 MGOe). It is found that the degree of alignment (DoA) of 99 % is achieved in the 95 wt.% magnets, whereas the 97 wt.% magnets are limited to a DoA of 90 % respectively. The high DoA can be attributed to low particle-particle interaction during the post-magnetic field alignment process. This research provides a useful insight of binder-particle interactions at very high magnet weight fractions and their effect on magnetic strength and performance.

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挤出压缩成型关键无稀土粘结永磁体

钐氮化铁（Sm-Fe-N）键合磁体由于其特殊的磁性而成为各种工业应用的有希望的候选者。在聚酰胺（PA12）聚合物粘合剂中，磁性材料SmFeN的重量分数为95 wt.% （~ 74 vol%）和97 wt.% （~ 81 vol%）的化合物使用间歇混合器，然后进行压缩成型。最大能量积（BH）max为186.21 kJ。在95% wt.%的粘结磁体中达到m-3 (23.4 MGOe)；97%磁体的（BH）最大值为165.52 kJ。m-3 （20.8 MGOe）。结果表明，95% wt.%磁体的对准度（DoA）达到99%，而97% wt.%磁体的对准度（DoA）分别限制在90%。高DoA可归因于后磁场对准过程中粒子间的低相互作用。这项研究提供了一个有用的见解在非常高的磁体重量分数的粘合剂-颗粒相互作用及其对磁性强度和性能的影响。

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来源期刊

Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

6.40

自引率

2.90%

发文量

345

审稿时长

36 days

期刊介绍： Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).