Production of Permanent Magnets from Recycled NdFeB Powder with Powder Extrusion Moulding

IF 4.7 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC ACS Applied Electronic Materials Pub Date : 2024-04-18 DOI:10.3390/jmmp8020081

Stefan Rathfelder, S. Schuschnigg, C. Kukla, C. Holzer, C. Burkhardt

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Abstract

In the last fifteen years, several groups have investigated metal injection moulding (MIM) of NdFeB powder to produce isotropic or anisotropic rare earth magnets of greater geometric complexity than that achieved by the conventional pressing and sintering approach. However, due to the powder’s high affinity for oxygen and carbon uptake, sufficient remanence and coercivity remains difficult. This article presents a novel approach to producing NdFeB magnets from recycled material using Powder Extrusion Moulding (PEM) in a continuous process. The process route uses powder obtained from recycling rare earth magnets through Hydrogen Processing of Magnetic Scrap (HPMS). This article presents the results of tailored powder processing, the production of mouldable feedstock based on a special binder system, and moulding with PEM to produce green and sintered parts. The magnetic properties and microstructures of debinded and sintered samples are presented and discussed, focusing on the influence of filling ratio and challenging processing conditions on interstitial content as well as density and magnetic properties.

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用回收的钕铁硼粉末挤压成型生产永磁材料

在过去的 15 年中，一些研究小组对钕铁硼粉末的金属注射成型（MIM）进行了研究，以生产出各向同性或各向异性稀土磁体，其几何复杂性高于传统的压制和烧结方法。然而，由于钕铁硼粉末对氧和碳的吸收亲和性较高，因此仍然难以产生足够的剩磁和矫顽力。本文介绍了一种利用粉末挤压成型（PEM）连续工艺从回收材料中生产钕铁硼磁体的新方法。该工艺路线使用通过磁性废料氢处理（HPMS）从回收的稀土磁体中获得的粉末。本文介绍了定制粉末加工、基于特殊粘合剂系统的可模塑原料生产以及使用 PEM 模塑生产绿色和烧结部件的结果。文章介绍并讨论了去骨和烧结样品的磁性能和微观结构，重点是填充率和挑战性加工条件对间隙含量以及密度和磁性能的影响。

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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567

期刊介绍： ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric. Indexed/Abstracted： Web of Science SCIE Scopus CAS INSPEC Portico

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