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摘要 ：
The oil-based Nd-Fe-B sludge waste was directly recycled to single-phase Nd2Fe14B powders via the combination of purification and modified Ca-reduction reaction method. The impurities and organics in the purified Nd-Fe-B sludge waste were greatly reduced, reducing calcium consumption in the subsequent reduction and diffusion (RD) process, thereby reducing the cost. By further optimizing the Ca-reduction diffusion parameters, especially the mass ratio of CaCl2 and KCl, where the liquid CaCl2, along with the gaseous KCl provide conditions for sufficient and uniform Ca-reduction reaction, high-property Nd-Fe-B magnetic powders with good dispersion, uniform particle sizes, and excellent orientation, were successfully obtained. Using the mixed diffusion medium of CaCl2 and KCl with a mass ratio of 1:1, the room-temperature magnetization of the recycled Nd-Fe-B powders was increased to 157 emu/g at 3 T-magnetic field, which was about 28 % higher than that of the original sludge. The contents of carbon, hydrogen, and oxygen in the recycled magnetic powders were significantly reduced from 6.8, 1.8, and 5.9 wt% to 0.1, 0.19, and 0.56 wt%, respectively. In addition, the uniform grain size with X-50 = 3.6 mu m and good distribution greatly improved the orientation, which can be beneficial to the preparation of the bonded or sintered Nd-Fe-B based magnets. The reasons that CaCl2-KCl mixed diffusion medium can lead to well-dispersed, uniform recycled powder with high magnetization arise from a combination of factors for improving the liquid phase reaction environment and the gaseous KCl to prevent agglomeration and inhibit particles merging or growth.
关键词 ：
Ca-reduction reaction Ca-reduction reaction Nd-Fe-B sludge waste Nd-Fe-B sludge waste Purification Purification Recycling Recycling
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| GB/T 7714 | Xu, Haibo , Wang, Feng , Lu, Qingmei et al. Nd-Fe-B: From sludge waste to powders via purification and modified Ca-reduction reaction process [J]. | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2022 , 543 . |
| MLA | Xu, Haibo et al. "Nd-Fe-B: From sludge waste to powders via purification and modified Ca-reduction reaction process" . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 543 (2022) . |
| APA | Xu, Haibo , Wang, Feng , Lu, Qingmei , Qiu, Yubing , Liu, Weiqiang , Chen, Jingwu et al. Nd-Fe-B: From sludge waste to powders via purification and modified Ca-reduction reaction process . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2022 , 543 . |
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摘要 ：
MnCoGe是MM′X型马氏体相变材料体系中最具代表性的研究对象之一.由于其结构相变温度高于自身的磁有序温度,研究者采用了各种调控方法来降低结构相变温度以实现磁共结构耦合.但是,针对稀土元素在这类体系中的掺杂效应较少被报道.因此,本文研究了Mn_(1-x)La_xCoGe (x=0, 0.01, 0.02, 0.03, 0.05)系列化合物的结构与磁性. La的加入引起主相中Mn和Ge元素的成分缺失,使得马氏体转变温度逐渐降低,实现了磁共结构耦合.然而,由于La导致元素成分缺失的能力有限,进一步增加掺杂量导致析出更多的第二相但却没有引起相变温度的持续降低.在微观组织中观察到主相被针状第二相分隔...
关键词 ：
稀土元素 稀土元素 磁结构耦合 磁结构耦合 MM′X MM′X 磁热效应 磁热效应 MnCoGe MnCoGe
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| GB/T 7714 | 张红国 , 石晋豪 , Hidayah Andi Imam et al. 稀土元素La在MnCoGe体系中的掺杂效应 [J]. | 中国科学:物理学 力学 天文学 , 2021 , 51 (06) : 127-134 . |
| MLA | 张红国 et al. "稀土元素La在MnCoGe体系中的掺杂效应" . | 中国科学:物理学 力学 天文学 51 . 06 (2021) : 127-134 . |
| APA | 张红国 , 石晋豪 , Hidayah Andi Imam , 吴正 , 乔文静 , 岳明 . 稀土元素La在MnCoGe体系中的掺杂效应 . | 中国科学:物理学 力学 天文学 , 2021 , 51 (06) , 127-134 . |
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摘要 ：
In this paper, the open recoil loop is simulated by establishing the simulation model of hard-phase grains (Sm2Co7) dispersed in soft-phase (alpha-Fe) matrix. The influence of inter-phase exchange coupling effect on the openness is simulated by adjusting the soft/hard phase interface integral exchange constant (A(int)). The results show that the openness does not depend on the inter-phase exchange coupling effect, since the open recoil loops can be acquired even the A(int) decrease from 20 to 0 pJ/m. The interaction energy density analysis also does not provide strong evidence to support the correlation between openness and exchange coupling effect. The magnetization configuration evolution shows the irreversible reversal of the hard-phase grains is root cause of the openness, and the adjacent soft phase enlarge the openness degree for the recoil loop of the nanocompiste magnet. Our results are helpful to deepen the understanding of the openness in recoil loops for nanostructural permanent magnet materials.
关键词 ：
Exchange coupling Exchange coupling Micromagnetic simulation Micromagnetic simulation Nanocomposite magnet Nanocomposite magnet Recoil loop Recoil loop
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| GB/T 7714 | Li, Yuqing , Teng, Yuan , Xu, Xiaochang et al. Simulation on the openness in recoil loop of nanocomposite magnet [J]. | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2021 , 538 . |
| MLA | Li, Yuqing et al. "Simulation on the openness in recoil loop of nanocomposite magnet" . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 538 (2021) . |
| APA | Li, Yuqing , Teng, Yuan , Xu, Xiaochang , Zhang, Yu , Yue, Ming . Simulation on the openness in recoil loop of nanocomposite magnet . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2021 , 538 . |
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摘要 ：
在向绿色可持续发展目标迈进的过程中,能效比低且排放温室气体的传统气体压缩制冷技术面临较大环保压力。基于磁热效应的磁制冷技术绿色而高效,是新型固态制冷领域中具有较大实用化潜力的一种。磁制冷技术的核心是寻找成本低廉、无毒害、制冷区间大以及制冷效率高的制冷工质材料。近年来,具有马氏体相变的MM′X型化合物由于其较宽的相变调节温区和较高的磁热效应而颇受关注,成为磁致冷材料领域内研究的热点之一。国内外学者在优化MM′X体系性能及通过不同方式实现其磁结构耦合方面已经取得了令人瞩目的成果。将在简要回顾MM′X体系发展历程的基础上,着重介绍几个新的研究动向,包括双晶位掺杂调节相变、稀土元素替代、引入d-d杂化...
关键词 ：
MM′X化合物 MM′X化合物 磁热效应 磁热效应 磁结构耦合 磁结构耦合 磁致冷材料 磁致冷材料 马氏体相变 马氏体相变
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| GB/T 7714 | 岳明 , 张红国 . MM′X型磁相变材料的若干研究进展 [J]. | 金属功能材料 , 2021 , 28 (04) : 1-12 . |
| MLA | 岳明 et al. "MM′X型磁相变材料的若干研究进展" . | 金属功能材料 28 . 04 (2021) : 1-12 . |
| APA | 岳明 , 张红国 . MM′X型磁相变材料的若干研究进展 . | 金属功能材料 , 2021 , 28 (04) , 1-12 . |
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摘要 ：
With the development of bonded Nd-Fe-B magnets, modifying epoxy resin (EP) binder has become a key factor to improve the properties of bonded Nd-Fe-B magnets. In this work, the magnetic properties, compressive strength, and microstructure of the bonded Nd-Fe-B magnets with diaminodiphenylmethane (DDM)-cured EP binder were systematically investigated. The results show that adding 20 wt% DDM to EP monomer maintains excellent magnetic properties while obtaining optimal temperature resistance and high compressive strength for magnets. Because the molecular structure of the DDM curing agent contains rigid groups, it can enhance the heat resistance and mechanical properties of the EP binder. In addition, fracture surface morphology observation reveals the bonding mechanism of DDM-EP bonded magnets and confirms the advantageous nature of DDM-EP binder for bonded magnets. © 1965-2012 IEEE.
关键词 ：
Compressive strength Compressive strength Curing Curing Epoxy resins Epoxy resins Heat resistance Heat resistance Iron alloys Iron alloys Magnetic properties Magnetic properties Morphology Morphology Neodymium alloys Neodymium alloys Permanent magnets Permanent magnets Surface morphology Surface morphology
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| GB/T 7714 | Xi, Wang , Liu, Weiqiang , Yue, Ming et al. DDM Curing Enhancement for the Epoxy Resin Binder Bonded Nd-Fe-B Magnets [J]. | IEEE Transactions on Magnetics , 2021 , 57 (2) . |
| MLA | Xi, Wang et al. "DDM Curing Enhancement for the Epoxy Resin Binder Bonded Nd-Fe-B Magnets" . | IEEE Transactions on Magnetics 57 . 2 (2021) . |
| APA | Xi, Wang , Liu, Weiqiang , Yue, Ming , Zhang, Dongtao , Lu, Qingmei , Zhang, Hongguo et al. DDM Curing Enhancement for the Epoxy Resin Binder Bonded Nd-Fe-B Magnets . | IEEE Transactions on Magnetics , 2021 , 57 (2) . |
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摘要 ：
High-performance ferromagnetic materials are essential for energy conversion and electronic devices. However, the random and nonuniform magnetization reversal in ferromagnetics limits their performance that can be achieved. Here, through both micromagnetism simulations and experiments, a directional magnetization reversal that initiates first from large grains toward smaller ones is discovered by engineering Nd2Fe14B/alpha-Fe gradient nanostructures. Such directional magnetization reversal enables a rare combination of high magnetization and large coercivity, thus leading to a record-high energy density (26 MG Oe) for isotropic permanent magnetic materials, which is approximate to 50% higher than that of its gradient-free counterpart. The unusual magnetization reversal originates from an ordered arrangement of grain sizes in the gradient material, where the large grains have a lower reversal field than that of the smaller ones. These findings open up new opportunities for developing high-performance magnetic materials.
关键词 ：
energy density energy density ferromagnetic materials ferromagnetic materials gradients gradients hybrid nanostructures hybrid nanostructures magnetization reversal magnetization reversal permanent-magnet materials permanent-magnet materials
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| GB/T 7714 | Lou, Li , Li, Yuqing , Li, Xiaohong et al. Directional Magnetization Reversal Enables Ultrahigh Energy Density in Gradient Nanostructures [J]. | ADVANCED MATERIALS , 2021 , 33 (36) . |
| MLA | Lou, Li et al. "Directional Magnetization Reversal Enables Ultrahigh Energy Density in Gradient Nanostructures" . | ADVANCED MATERIALS 33 . 36 (2021) . |
| APA | Lou, Li , Li, Yuqing , Li, Xiaohong , Li, Hailing , Li, Wei , Hua, Yingxin et al. Directional Magnetization Reversal Enables Ultrahigh Energy Density in Gradient Nanostructures . | ADVANCED MATERIALS , 2021 , 33 (36) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Bulk anisotropic Sm2Co7 nanocrystalline magnets were successfully prepared by hot deformation process using spark plasma sintering technology. The coercivity of the isotropic Sm2Co7 nanocrystalline magnet is 34.76 kOe, further, the ultra-high coercivity of 50.68 kOe is obtained in the anisotropic hot deformed Sm2Co7 magnet when the height reduction is 70%, which is much higher than those of the ordinarily produced hot deformed Sm2Co7 magnet. X-ray diffraction (XRD) analysis shows that all the samples are Sm2Co7 single phase. The investigation by electron backscatter diffraction indicates that increasing the amount of deformation is beneficial to the improvement of the (00l) texture of Sm2Co7 magnets. The Sm2Co7 nanocrystalline magnet generates a strong c-axis crystallographic texture during large deformation process.
关键词 ：
hot deformation hot deformation Sm2Co7 magnet Sm2Co7 magnet spark plasma sintering spark plasma sintering texture texture ultra-high coercivity ultra-high coercivity
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| GB/T 7714 | Ma, Qiang , Jia, Meishuang , Hu, Zhifeng et al. Texture analysis of ultra-high coercivity Sm2Co7 hot deformation magnets* [J]. | CHINESE PHYSICS B , 2021 , 30 (4) . |
| MLA | Ma, Qiang et al. "Texture analysis of ultra-high coercivity Sm2Co7 hot deformation magnets*" . | CHINESE PHYSICS B 30 . 4 (2021) . |
| APA | Ma, Qiang , Jia, Meishuang , Hu, Zhifeng , Yue, Ming , Liu, Yanli , Zhao, Tongyun et al. Texture analysis of ultra-high coercivity Sm2Co7 hot deformation magnets* . | CHINESE PHYSICS B , 2021 , 30 (4) . |
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摘要 ：
Phase and texture evolution of the hot-deformed Sm(Co,Fe,Cu,Zr)z magnet prepared by spark plasma sintering (SPS) have been investigated. The effects of hot deformation temperature and height reduction on the phase structure and magnetic properties of the magnet were studied. The results show that with 90% height reduction at 900 °C, the hot-deformed magnet with TbCu7 structure obtains an obvious c -axis texture. However, with increasing hot deformation temperature, some 1:7H phases decompose into 2:17R, 1:5H, and Zr-rich particle phases in the hot deformation process. The hot-deformed magnet with 85% height reduction possesses a remanence ( Mr ) of 6.9 kG, which is higher than that of the isotopic precursor. © 1965-2012 IEEE.
关键词 ：
Binary alloys Binary alloys Copper alloys Copper alloys Deformation Deformation Grain size and shape Grain size and shape Magnets Magnets Spark plasma sintering Spark plasma sintering Terbium alloys Terbium alloys Textures Textures Zirconium compounds Zirconium compounds
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| GB/T 7714 | Yang, Y.Q. , Zhang, D.T. , Li, Y.Q. et al. Phase and Texture Evolution of Hot-Deformed Sm(Co,Fe,Cu,Zr)zMagnet [J]. | IEEE Transactions on Magnetics , 2021 , 57 (2) . |
| MLA | Yang, Y.Q. et al. "Phase and Texture Evolution of Hot-Deformed Sm(Co,Fe,Cu,Zr)zMagnet" . | IEEE Transactions on Magnetics 57 . 2 (2021) . |
| APA | Yang, Y.Q. , Zhang, D.T. , Li, Y.Q. , Zhang, H.G. , Liu, W.Q. , Yue, M. . Phase and Texture Evolution of Hot-Deformed Sm(Co,Fe,Cu,Zr)zMagnet . | IEEE Transactions on Magnetics , 2021 , 57 (2) . |
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摘要 ：
一种Pr‑Fe‑(C, B)稀土永磁材料及其制备方法，涉及永磁材料技术领域，Pr‑Fe‑(C, B)稀土永磁材料，由具有按原子百分比计组成的物质组成Pr15Fe79(C1‑x, Bx)6，0.2＜x≤0.8；制备工艺包括配料、熔炼、熔体快淬、退火，其中，熔体快淬是采用铜辊转速30≤V≤40m/s的真空快淬炉在保护气氛下进行，退火是在保护气氛下在600‑950℃的退火炉中进行。在本发明利用Nd2Fe14B相的高稳定性，B原子的原子尺寸与C原子相似的特性，用B原子部分替代Pr2Fe14C中的C原子，大幅提升了Pr2Fe14(C, B)稳定性，提高了Pr2Fe14(C, B)相含量，使矫顽力大大提高。
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| GB/T 7714 | 岳明 , 姚辉 , 张红国 et al. 一种Pr-Fe-(C, B)稀土永磁材料及其制备方法 : CN202110166224.X[P]. | 2021-02-05 . |
| MLA | 岳明 et al. "一种Pr-Fe-(C, B)稀土永磁材料及其制备方法" : CN202110166224.X. | 2021-02-05 . |
| APA | 岳明 , 姚辉 , 张红国 , 刘卫强 , 张东涛 , 路清梅 . 一种Pr-Fe-(C, B)稀土永磁材料及其制备方法 : CN202110166224.X. | 2021-02-05 . |
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摘要 ：
The main difficulty for the recovery of Nd-Fe-B bonded magnet wastes is how to completely remove the epoxy resins. In this study, chemical reaction and physical dissolution were combined to remove the epoxy resins by adding ammonia-water and mixed organic solvents. Ammonia-water can react with the epoxy functional group of epoxy resin to generate polyols. Mixed organic solvents of alcohol, dimethyl formamide (DMF), and tetrahydrofuran (THF) can dissolve the generated polyols and residual epoxy resins. Under the optimum processing conditions, the epoxy resins in the waste magnetic powders are substantially removed. The oxygen and carbon contents in the recycled magnetic powder are reduced from 13500 x 10(-6) to 1600 x 10(-6) and from 19500 x 10(-6) to 2100 x 10(-6) with the reduction ratio of 88.1% and 89.2%, respectively. The recycled magnetic powder presents improved magnetic properties with Ms of 1.306 x 10(-1) A.m(2)/g, Mr of 0.926 x 10(-1) A.m(2)/g, Hcj of 1.170 T, and (BH) max of 125.732 kJ/m(3), which reach 99.8%, 99.4%, 95.9%, and 96.9% of the original magnetic powders, respectively. (C) 2021 The Authors. Published by Elsevier B.V.
关键词 ：
Epoxy resin Epoxy resin Nd-Fe-B bonded magnet wastes Nd-Fe-B bonded magnet wastes Open-loop reaction Open-loop reaction Physical dissolution Physical dissolution Rare earths Rare earths Recycled magnetic powders Recycled magnetic powders
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| GB/T 7714 | Liu, Min , Cui, Haiyuan , Li, Qingyan et al. Magnetic property recovery in Nd-Fe-B bonded magnet wastes with chemical reaction and physical dissolution [J]. | JOURNAL OF RARE EARTHS , 2021 , 39 (11) : 1396-1401 . |
| MLA | Liu, Min et al. "Magnetic property recovery in Nd-Fe-B bonded magnet wastes with chemical reaction and physical dissolution" . | JOURNAL OF RARE EARTHS 39 . 11 (2021) : 1396-1401 . |
| APA | Liu, Min , Cui, Haiyuan , Li, Qingyan , Zhu, Peihong , Liu, Weiqiang , Lu, Qingmei et al. Magnetic property recovery in Nd-Fe-B bonded magnet wastes with chemical reaction and physical dissolution . | JOURNAL OF RARE EARTHS , 2021 , 39 (11) , 1396-1401 . |
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