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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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).