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学者姓名：岳明
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Abstract ：
The significant reduction in coercivity poses a challenge to achieving the ultra-high theoretical magnetic energy products in Nd2Fe14B/alpha-Fe nanocomposites experimentally. Here, we employs micromagnetic simulation to establish an easily realizable theoretical nanocomposite model, and experimentally achieves the chemical composition configuration fitting the theoretical model in the Nd2Fe14B/alpha-Fe system by regulating the melt-spun process. Both theoretical simulations and experimental results confirm that the nanocomposites with alpha-Fe arranged in three-dimensional (3D) chain-like distribution exhibit substantially higher coercivity compared to those with alpha-Fe in granular distribution. Comprehensive macroscopic magnetization analysis and simulated magnetization configuration evolution demonstrate that the 3D chain-like distributed soft-magnetic phase promotes a more consistent and uniform magnetization reversal process, thereby realizing high coercivity. Our findings provide reliable insights and guidance for improving the magnetic properties of nanocomposite permanent magnets.
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| GB/T 7714 | Li, Yuqing , Wang, Jinjin , Liu, Manying et al. Matching the experimental chemical composition configuration and theoretical model in Nd2Fe14B/α-Fe nanocomposites to improve coercivity [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2024 , 12 (22) : 8161-8171 . |
| MLA | Li, Yuqing et al. "Matching the experimental chemical composition configuration and theoretical model in Nd2Fe14B/α-Fe nanocomposites to improve coercivity" . | JOURNAL OF MATERIALS CHEMISTRY C 12 . 22 (2024) : 8161-8171 . |
| APA | Li, Yuqing , Wang, Jinjin , Liu, Manying , Xu, Xuerui , Bian, Mengying , Liu, Weiqiang et al. Matching the experimental chemical composition configuration and theoretical model in Nd2Fe14B/α-Fe nanocomposites to improve coercivity . | JOURNAL OF MATERIALS CHEMISTRY C , 2024 , 12 (22) , 8161-8171 . |
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Abstract ：
In this study, new grain boundary diffusion (GBD) technology is applied to Nd-Fe-B sintered magnets with different thicknesses utilizing DyH3 nanopowder. The weight ratio is 0.25 wt.%. For comparison, the GBD processes include solid-liquid phase separation diffusion (SepD) and solid-liquid phase simultaneous diffusion (SimD). The magnetic properties and microstructure of GBD magnets with different thicknesses are thoroughly investigated. The comprehensive magnetic properties of SepD magnets are higher than SimD magnets. When the magnets are 8 mm thick, the SepD magnet obtains a coercivity of 18.10 kOe, which is higher than the SimD magnets (17.00 kOe). It was determined that SepD can manufacture thick magnets with excellent coercivity. In SepD magnets, the Dy element diffusion distance is deeper than in SimD magnets. For SepD magnets, there are core-shell structures formed in the surface region, while there are anti-core-shell structures that are unfavorable to magnetic properties in the surface region of the SimD magnets. The enhanced coercivity and temperature stability of the SepD magnets is primarily due to the more continuous core-shell structures produced by the deeper diffusion depth of the Dy element. This study will provide more theoretical guidance for the application of SepD in magnets with different thicknesses.
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| GB/T 7714 | Wu, Haihui , Liu, Weiqiang , Wang, Zhanjia et al. Solid-liquid phase separation diffused Nd-Fe-B sintered magnets by using DyH3 nanopowder realize high-efficiency coercivity improvement and overcome thickness limit [J]. | AIP ADVANCES , 2024 , 14 (1) . |
| MLA | Wu, Haihui et al. "Solid-liquid phase separation diffused Nd-Fe-B sintered magnets by using DyH3 nanopowder realize high-efficiency coercivity improvement and overcome thickness limit" . | AIP ADVANCES 14 . 1 (2024) . |
| APA | Wu, Haihui , Liu, Weiqiang , Wang, Zhanjia , Ji, Ming , Du, Ruihua , Li, Yuqing et al. Solid-liquid phase separation diffused Nd-Fe-B sintered magnets by using DyH3 nanopowder realize high-efficiency coercivity improvement and overcome thickness limit . | AIP ADVANCES , 2024 , 14 (1) . |
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Abstract ：
At present, the research on the recycling of bonded Nd-Fe-B magnet wastes is primarily conducted at the laboratory level. This study presents the kilogram-scale recycling of waste bonded Nd-Fe-B magnets using a NaOH-ethylene glycol solution. The impact of reaction temperature and catalyst concentration on the recycling process at this scale was investigated, and regenerated bonded Nd-Fe-B magnets were prepared from recycled magnetic powders. The magnetic properties of the recycled powders and regenerated magnets closely resembled those of the original products. Additionally, a life cycle assessment was conducted to analyze the production and recycling process of bonded Nd-Fe-B magnetic powders, revealing lower environmental impacts for the recycling process compared to production. Therefore, successful scale-up recycling through a NaOH-ethylene glycol solution demonstrates potential commercial and environmental opportunities for bonded Nd-Fe-B magnet waste.
Keyword ：
bonded Nd-Fe-B magnet waste bonded Nd-Fe-B magnet waste life cycle assessment life cycle assessment short-processrecycling short-processrecycling magnetic property magnetic property repreparation magnets repreparation magnets
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| GB/T 7714 | Zhu, Peihong , Liu, Min , Yang, Yaxuan et al. Recycling Bonded Nd-Fe-B Magnet Wastes: Recycle, Repreparation, and Life Cycle Assessment [J]. | ACS SUSTAINABLE CHEMISTRY & ENGINEERING , 2024 , 12 (34) : 12858-12868 . |
| MLA | Zhu, Peihong et al. "Recycling Bonded Nd-Fe-B Magnet Wastes: Recycle, Repreparation, and Life Cycle Assessment" . | ACS SUSTAINABLE CHEMISTRY & ENGINEERING 12 . 34 (2024) : 12858-12868 . |
| APA | Zhu, Peihong , Liu, Min , Yang, Yaxuan , Gao, Ke , Xuan, Yueheng , Liu, Weiqiang et al. Recycling Bonded Nd-Fe-B Magnet Wastes: Recycle, Repreparation, and Life Cycle Assessment . | ACS SUSTAINABLE CHEMISTRY & ENGINEERING , 2024 , 12 (34) , 12858-12868 . |
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Abstract ：
The Sm-Zr-Fe-Co-Ti quinary-alloys with ThMn12 structure has attracted wide attention for ultra-high intrinsic magnetic properties, showing potentiality to be developed into rare-earth permanent magnets. The Ti element in alloys is crucial for phase stability and magnetic properties, and lower Ti content can increase intrinsic magnetic properties but reduce phase stability. In this study, the 1:12 single-phase melt-spun ribbons with low Ti content was successfully prepared using a rapid solidification non-equilibrium method for the Sm1.1Zr0.2Fe9.2Co2.3Ti0.5 quinary-alloy. However, this non-equilibrium ribbon did not achieve good magnetic hardening due to the uneven microstructure and microstrain. Then, annealing was carried out to eliminate micro-strain and homogenize microstructure, therefore, remanence and coercivity were significantly improved even the precipitation of a small amount of alpha-Fe phase which were not conducive to coercivity. The remanence of 86.1 emu/g and coercivity of 151 kA/m was achieved when annealing at 850 degrees C for 45 min. After hot pressing, under the action of high temperature and pressure, a small portion of ThMn12 phases in the magnet decompose into Sm-rich phases and alpha-Fe, while remanence of 4.02 kGs (1 Gs = 10(-4) T), and coercivity of 1.12 kOe (1 Oe = 79.5775 A & sdot;m(-1)) were still acquired. Our findings can provide reference for exploring practical permanent magnets made of 1:12 type quinary-alloys.
Keyword ：
microstructure microstructure 75.50.Ww 75.50.Ww magnetic materials magnetic materials (Sm,Zr)(Fe,Co,Ti)(12) magnets (Sm,Zr)(Fe,Co,Ti)(12) magnets 75.75.Cd 75.75.Cd nanocrystalline magnet nanocrystalline magnet 75.75.-C 75.75.-C
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| GB/T 7714 | Zhang, Xing-Feng , Liu, Li-Bin , Li, Yu-Qing et al. Preparation and magnetic hardening of low Ti content (Sm,Zr)(Fe,Co,Ti)12 magnets by rapid solidification non-equilibrium method [J]. | CHINESE PHYSICS B , 2024 , 33 (9) . |
| MLA | Zhang, Xing-Feng et al. "Preparation and magnetic hardening of low Ti content (Sm,Zr)(Fe,Co,Ti)12 magnets by rapid solidification non-equilibrium method" . | CHINESE PHYSICS B 33 . 9 (2024) . |
| APA | Zhang, Xing-Feng , Liu, Li-Bin , Li, Yu-Qing , Zhang, Dong-Tao , Liu, Wei-Qiang , Yue, Ming . Preparation and magnetic hardening of low Ti content (Sm,Zr)(Fe,Co,Ti)12 magnets by rapid solidification non-equilibrium method . | CHINESE PHYSICS B , 2024 , 33 (9) . |
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Abstract ：
Conducting a comprehensive analysis of life cycle assessment and life cycle cost is critical for quantifying environmental impacts and estimating production costs associated with new production methods. Therefore, the life cycle assessment and life cycle cost of 1 kg bonded Nd-Fe-B magnetic powder produced by different production methods from "cradle to gate" are studied in this study. The results indicate that recycling is more advantageous than direct production in both environmental and economic terms. Specifically, the endpoint impact categories for 1 kg of bonded Nd-Fe-B powder produced by various methods reveal that recycling and regeneration reduce the environmental impact by 42%, 41%, and 42% compared to direct production in the categories of Human Health, Ecosystem Diversity, and Resource Availability, respectively. Additionally, in terms of life cycle cost, recycling yields savings of 47% and 32% compared to direct production in the internal and external life cycle cost, respectively. The results demonstrate that the environmentally friendly and cost-reducing method of recycling and regeneration points out a pathway for transforming the industrial structure of bonded Nd-Fe-B magnetic powder.
Keyword ：
Simapro Simapro life cycle costing (LCC) life cycle costing (LCC) Recipe 2016 method Recipe 2016 method bonded Nd-Fe-B magnet waste bonded Nd-Fe-B magnet waste life cycle assessment (LCA) life cycle assessment (LCA)
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| GB/T 7714 | Yang, Yaxuan , Liu, Min , Zhu, Peihong et al. Comparative Life Cycle Assessment and Life Cycle Cost Analysis of Bonded Nd-Fe-B Magnets: Virgin Production versus Recycling [J]. | SUSTAINABILITY , 2024 , 16 (19) . |
| MLA | Yang, Yaxuan et al. "Comparative Life Cycle Assessment and Life Cycle Cost Analysis of Bonded Nd-Fe-B Magnets: Virgin Production versus Recycling" . | SUSTAINABILITY 16 . 19 (2024) . |
| APA | Yang, Yaxuan , Liu, Min , Zhu, Peihong , Gao, Ke , Xuan, Yueheng , Lu, Qingmei et al. Comparative Life Cycle Assessment and Life Cycle Cost Analysis of Bonded Nd-Fe-B Magnets: Virgin Production versus Recycling . | SUSTAINABILITY , 2024 , 16 (19) . |
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Abstract ：
In this study, we reported on the bulk anisotropic nanocrystalline Sm1-xPrxCo5 (x = 0.2-0.6) magnets aimed at achieving excellent energy products. Through a combination of advanced processing techniques, including melt spinning, hot pressing, and hot deformation process, bulk magnets with a fine nanocrystalline structure were successfully synthesized. The results revealed that the substitution of Pr strengthened the c-axis texture and the saturation magnetization, facilitating the enhancement of remanence (Mr) and maximum magnetic energy product [(BH)max]. However, Pr substitution decreased the coercivity (Hci) due to the reduced magnetocrystalline anisotropy field. Excellent magnetic properties are obtained for Sm0.4Pr0.6Co5 magnets with the (BH)max of 23.2 MGOe and Hci of 11.8 kOe. The prepared (Sm,Pr)Co5 magnets with different Pr contents have essentially the same microstructure with RECo5 main phase grains of about 400 nm in diameter and fine dispersed rare earthrich nanoprecipitates. Our findings can provide reliable reference for manufacturing nanocrystalline permanent magnet materials and promote the development of rare earth permanent magnet new materials.
Keyword ：
Hot deformation Hot deformation Magnetic properties Magnetic properties Rare earth permanent magnet materials Rare earth permanent magnet materials C -axis texture C -axis texture Microstructure Microstructure
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| GB/T 7714 | Liu, Wenhe , Li, Yuqing , Liu, Lin et al. Tunning Pr to achieve ultra-high magnetic properties of anisotropic nanocrystalline (Sm,Pr)Co5 magnets [J]. | MATERIALS CHARACTERIZATION , 2024 , 217 . |
| MLA | Liu, Wenhe et al. "Tunning Pr to achieve ultra-high magnetic properties of anisotropic nanocrystalline (Sm,Pr)Co5 magnets" . | MATERIALS CHARACTERIZATION 217 (2024) . |
| APA | Liu, Wenhe , Li, Yuqing , Liu, Lin , Xia, Weixing , Bian, Mengying , Song, Wenna et al. Tunning Pr to achieve ultra-high magnetic properties of anisotropic nanocrystalline (Sm,Pr)Co5 magnets . | MATERIALS CHARACTERIZATION , 2024 , 217 . |
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Abstract ：
关于钕铁硼磁体回收的研究越来越受到重视,但在起步阶段回收制备技术是否能够真正带来环境效益是不确定的。采用ReCiPe评价方法,选取制备1 kg黏结钕铁硼磁体为功能单位,分别对黏结钕铁硼磁体直接制备和回收制备流程的环境影响进行评价并对比。结果表明直接制备流程中对环境影响最大的关键阶段为熔炼阶段,环境影响主要由钕和电力产生。回收制备流程对环境影响最大的关键阶段为去除有机物阶段和热压固化阶段,环境影响主要由次氯酸钠和电力产生。生产1 kg黏结钕铁硼磁体,直接制备工艺对人体健康损害、生态健康损害和资源耗竭的环境损害分别是回收制备工艺的158.40%、180.63%、63.37%。
Keyword ：
黏结钕铁硼 黏结钕铁硼 回收再利用 回收再利用 固体废弃物 固体废弃物 生命周期评价 生命周期评价 绿色制造 绿色制造 环境影响 环境影响
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| GB/T 7714 | 刘敏 , 高可 , 朱佩鸿 et al. 黏结钕铁硼磁体生产和回收生命周期评价 [J]. | 北京工业大学学报 , 2024 , (03) : 290-298 . |
| MLA | 刘敏 et al. "黏结钕铁硼磁体生产和回收生命周期评价" . | 北京工业大学学报 03 (2024) : 290-298 . |
| APA | 刘敏 , 高可 , 朱佩鸿 , 杨雅轩 , 刘卫强 , 路清梅 et al. 黏结钕铁硼磁体生产和回收生命周期评价 . | 北京工业大学学报 , 2024 , (03) , 290-298 . |
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Abstract ：
2∶17型Sm(CoFeCuZr)_z烧结永磁体因其良好的磁性能和优异的温度稳定性，在航空航天、5G通讯、新能源技术等领域被广泛应用。Sm(CoFeCuZr)_z烧结永磁体的常规制备工艺为粉末冶金法，历经几十年的发展，国内外研究者针对Sm(CoFeCuZr)_z烧结磁体的制备工艺开展了大量的研究。特别是近年来，包括速凝、氢碎、气流磨、第二相掺杂等新工艺被逐步研究并应用于磁体的制备，磁体的综合性能实现了显著的优化。本文以2∶17型Sm(CoFeCuZr)_z烧结永磁体制备流程为主线，梳理了磁体在铸态合金、制粉工艺、第二相掺杂、热处理工艺等方面的研究进展，总结了不同的制备工艺对Sm(CoFeCuZr)_z永磁体微观结构和磁性能的影响，并对新工艺在高性能的Sm(CoFeCuZr)_z永磁体制备中推广应用进行了展望。
Keyword ：
铸态合金 铸态合金 热处理 热处理 Sm(CoFeCuZr)_z永磁体 Sm(CoFeCuZr)_z永磁体 制粉 制粉 制备工艺 制备工艺
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| GB/T 7714 | 尚志丰 , 马喜龙 , 杨建军 et al. Sm(CoFeCuZr)_z永磁制备新工艺研究进展 [J]. | 稀土 , 2024 , 45 (01) : 1-15 . |
| MLA | 尚志丰 et al. "Sm(CoFeCuZr)_z永磁制备新工艺研究进展" . | 稀土 45 . 01 (2024) : 1-15 . |
| APA | 尚志丰 , 马喜龙 , 杨建军 , 王云峤 , 张东涛 , 岳明 . Sm(CoFeCuZr)_z永磁制备新工艺研究进展 . | 稀土 , 2024 , 45 (01) , 1-15 . |
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Abstract ：
In this work, we explore how Ce in (Nd, Ce)-Fe-B magnet optimizes the microstructure of the base magnet, and enhances Grain Boundary Diffusion (GBD) of Dy. As Ce/total rare earth (TRE) content increases from 0 wt% to 16.95 wt%,the coercivity of the base magnets decreased by 24.93 %. However, lower-melting-point Ce element tended to distribute in the grain boundaries (GBs), and the thickness of the GBs layer increased from 2.46 nm to 5.54 nm. This provided more pathways for the subsequent GBD. Importantly, the diffusion depth of Dy element increased, and more core-shell structure formed as Ce increased. It led to a higher coercivity increment. Compared to GBD magnets without Ce, the coercivity increment of GBD magnets with Ce/TRE = 16.95 wt% increased by 39.54 %.
Keyword ：
Coercivity Coercivity Grain boundary diffusion Grain boundary diffusion Microstructure Microstructure Ce element Ce element (Nd, Ce)-Fe-B magnets (Nd, Ce)-Fe-B magnets
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| GB/T 7714 | Qin, Yuan , Wang, Zhanjia , Liu, Weiqiang et al. Analysis of mechanism for effectively coercivity increment in (Nd, Ce)-Fe-B diffusion magnets [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2024 , 1003 . |
| MLA | Qin, Yuan et al. "Analysis of mechanism for effectively coercivity increment in (Nd, Ce)-Fe-B diffusion magnets" . | JOURNAL OF ALLOYS AND COMPOUNDS 1003 (2024) . |
| APA | Qin, Yuan , Wang, Zhanjia , Liu, Weiqiang , Fan, Min , Song, Jie , Wang, Gang et al. Analysis of mechanism for effectively coercivity increment in (Nd, Ce)-Fe-B diffusion magnets . | JOURNAL OF ALLOYS AND COMPOUNDS , 2024 , 1003 . |
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Abstract ：
Sm2Fe17N3 compounds have emerged as promising candidates for a new generation of cost-effective permanent magnet materials. In this work, the Sm2Fe17N3 particles were synthesized through a series of steps involving mechanochemical and thermally activated reduction of metal oxides with calcium, followed by nitridation. Our results demonstrate that the mechanochemical milling of precursors significantly reduces the temperature required for the subsequent reduction-diffusion reaction. This enables the synthesis of Sm2Fe17N3 hard magnetic particles at a temperature below the melting point of calcium, which is 250 degrees C lower than those required for conventional reduction-diffusion processes. This reduction in temperature led to a decrease in the Sm2Fe17N3 particle size. Specifically, at a reduction-diffusion temperature of 800 degrees C, ultrafine Sm2Fe17N3 particles with an average diameter of 0.30 mu m, slightly smaller than the theoretically critical single-domain diameter, were obtained. The kinetics of the mechanochemical reactions occurring during ball milling have been extensively investigated. By fitting the proposed theoretical model with the experimental data, the kinetic parameters and quantitative expressions were determined. This work provides an in-depth understanding of environmentally friendly and low-cost mechanochemical processes, offering instructive information for the development of highperformance Sm2Fe17N3 permanent magnetic materials.
Keyword ：
Sm 2 Fe 17 N3 Sm 2 Fe 17 N3 Mechanochemistry Mechanochemistry Reduction-diffusion Reduction-diffusion Rare-earth permanent magnets Rare-earth permanent magnets
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| GB/T 7714 | Yang, Zhi , Chen, Yuanyuan , Yang, Haochuan et al. Ultrafine Sm2Fe17N3 hard magnetic particles synthesized by mechanochemical process [J]. | APPLIED MATERIALS TODAY , 2024 , 41 . |
| MLA | Yang, Zhi et al. "Ultrafine Sm2Fe17N3 hard magnetic particles synthesized by mechanochemical process" . | APPLIED MATERIALS TODAY 41 (2024) . |
| APA | Yang, Zhi , Chen, Yuanyuan , Yang, Haochuan , Nie, Xiaofeng , Xi, Junhua , Zhang, Jie et al. Ultrafine Sm2Fe17N3 hard magnetic particles synthesized by mechanochemical process . | APPLIED MATERIALS TODAY , 2024 , 41 . |
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