从废磁体中回收高矫顽力RE-Fe-B粉末

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetics Pub Date : 2022-06-30 DOI:10.4283/jmag.2022.27.2.117

Taebong Noh, Hee-Ryoung Cha, Yang-Do Kim, Jung-Goo Lee

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引用次数: 0

摘要

为了利用废磁体制备高矫顽力硬磁RE-Fe-B粉末，对废RE-Fe-B磁体采用氢衰(HD)和氢化歧化-解吸-复合(HDDR)工艺。通过系统研究HD和HDDR处理温度对最终回收粉末磁性和显微组织性能的影响，确定了废RE-Fe-B磁体的最佳HD和HDDR处理条件。在200℃下进行HD处理，废磁体被粉碎成粒径分布均匀的片状。在920℃下对HDDR处理薄片进行HDDR工艺处理，回收的RE-Fe-B HDDR粉末矫顽力可达11.2 kOe。根据显微组织表征的结果，详细讨论了HD和HDDR处理温度对回收粉末磁性和显微组织变化的影响。

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High Coercive RE-Fe-B Powders Recycled via HD and HDDR Process from Waste Magnets

In order to fabricate high-coercivity hard magnetic RE-Fe-B powders from the waste bulk magnets, the hydrogen decrepitation (HD) and hydrogenation-disproportionation-desorption-recombination (HDDR) processes were employed to the waste RE-Fe-B magnets. The optimum HD and HDDR conditions for the waste RE-Fe-B magnets were established through the systematic investigation on the effect of HD and HDDR treatment temperature on the magnetic and microstructural properties of final recycled powders. We found that the waste magnets were crushed into the flakes with a uniform size distribution when the HD treatment was carried at 200 ℃. By applying the HDDR process to the HD treated flakes at 920 ℃, high coercivity of 11.2 kOe could be achieved in the recycled RE-Fe-B HDDR powders. Based on the results from the microstructural characteriza-tion, the underlying reasons for the magnetic and microstructural changes of the recycled powders as a function of the HD and HDDR treatment temperature is discussed in detail.

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来源期刊

Journal of Magnetics MATERIALS SCIENCE, MULTIDISCIPLINARY-PHYSICS, APPLIED

CiteScore

1.00

自引率

20.00%

发文量

审稿时长

2.3 months

期刊介绍： The JOURNAL OF MAGNETICS provides a forum for the discussion of original papers covering the magnetic theory, magnetic materials and their properties, magnetic recording materials and technology, spin electronics, and measurements and applications. The journal covers research papers, review letters, and notes.