High-performance anisotropic SmCo-based magnet with novel microstructure

IF 5.2 1区化学 Q1 CHEMISTRY, APPLIED Journal of Rare Earths Pub Date : 2024-08-01 DOI:10.1016/j.jre.2023.08.006

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Abstract

A novel microstructure of magnetically anisotropic SmCo-based magnet with high-performance is reported. The magnet consists of SmCo₇-H (TbCu₇-hexagonal type), Sm₂Co₁₇–H (Th₂Ni₁₇-hexagonal type) and SmCo₃-R (SmCo₃-rhombohedral type) phases. The maximum magnetic energy product of the magnet is 231.69 kJ/m³, and the intrinsic coercivity is 1005.47 kA/m. An outstanding intrinsic coercivity temperature coefficient (β) of −0.125%/K between 298 and 773 K is obtained, which is very close to the β of commercial high-temperature Sm₂Co₁₇-based sintered magnets. The initial magnetization curve indicates that the coercivity mechanism is controlled by a domain wall pinning mechanism. The SmCo₃-R lamellar phase may be a potential pinning center or self-pinning center. The microstructure of the magnet is different from that of any previous SmCo-based magnets. These findings provide a new idea for preparing high-performance SmCo-based permanent magnets.

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具有新型微观结构的高性能各向异性SmCo基磁体

报告了一种具有高性能的磁各向异性钐钴基磁体的新型微观结构。该磁体由 SmCo7-H（TbCu7-六方型）、Sm2Co17-H（Th2Ni17-六方型）和 SmCo3-R（SmCo3-斜方型）三相组成。磁体的最大磁能积为 231.69 kJ/m3，本征矫顽力为 1005.47 kA/m。在 298 至 773 K 之间，本征矫顽力温度系数 (β)为 -0.125%/K，非常接近商用高温 Sm2Co17 基烧结磁体的 β 值。初始磁化曲线表明，矫顽力机制受制于畴壁钉扎机制。SmCo3-R 层状相可能是一个潜在的引脚中心或自引脚中心。该磁体的微观结构不同于以往任何一种钐钴基磁体。这些发现为制备高性能钐钴基永磁体提供了新思路。

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来源期刊

Journal of Rare Earths 化学-应用化学

CiteScore

8.70

自引率

14.30%

发文量

374

审稿时长

1.7 months

期刊介绍： The Journal of Rare Earths reports studies on the 17 rare earth elements. It is a unique English-language learned journal that publishes works on various aspects of basic theory and applied science in the field of rare earths (RE). The journal accepts original high-quality original research papers and review articles with inventive content, and complete experimental data. It represents high academic standards and new progress in the RE field. Due to the advantage of abundant RE resources of China, the research on RE develops very actively, and papers on the latest progress in this field emerge every year. It is not only an important resource in which technicians publish and obtain their latest research results on RE, but also an important way of reflecting the updated progress in RE research field. The Journal of Rare Earths covers all research and application of RE rare earths including spectroscopy, luminescence and phosphors, rare earth catalysis, magnetism and magnetic materials, advanced rare earth materials, RE chemistry & hydrometallurgy, RE metallography & pyrometallurgy, RE new materials, RE solid state physics & solid state chemistry, rare earth applications, RE analysis & test, RE geology & ore dressing, etc.