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学者姓名：岳明
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Abstract ：
In this work, the effect of Nd content on the interdiffusion mechanism of Nd/Dy elements in Nd-Dy-Fe-B magnets was elucidated by studying the differences in the magnetic properties, microstructure, and demagnetization process. As the Nd content increased, a uniform, continuous, and thicker layer of rare earth-rich (RE-rich) phase formed inside the magnets, which had a good magnetic isolation effect. During the demagnetization process, the strong ferromagnetic coupling effect between the main phase grains could be effectively weakened. At the same time, the thicker RE-rich phase layer could lead to a more obvious interdiffusion phenomenon of Nd/Dy elements, forming more (Nd, Dy)(2)Fe14B phases with high magnetocrystalline anisotropy fields, resulting in higher coercivity of the magnets. This paper elucidated the influence of Nd content on the interdiffusion mechanism of dual alloy Nd-Dy-Fe-B magnets, which had important significance for the preparation of high-performance Nd-Dy-Fe-B magnets.
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| GB/T 7714 | Qin, Yuan , Liu, Weiqiang , Wang, Zhanjia et al. The effect of Nd content on the elemental interdiffusion mechanism of Nd-Dy-Fe-B magnets [J]. | AIP ADVANCES , 2024 , 14 (1) . |
| MLA | Qin, Yuan et al. "The effect of Nd content on the elemental interdiffusion mechanism of Nd-Dy-Fe-B magnets" . | AIP ADVANCES 14 . 1 (2024) . |
| APA | Qin, Yuan , Liu, Weiqiang , Wang, Zhanjia , Chen, Hao , Du, Ruihua , Yue, Ming . The effect of Nd content on the elemental interdiffusion mechanism of Nd-Dy-Fe-B magnets . | AIP ADVANCES , 2024 , 14 (1) . |
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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 ：
The emergence of anisotropic neodymium-iron-boron (NdFeB)-bonded magnets with high energy density and freedom of shape design is effective in minimizing the dimensions and mass of electric motors. However, limitations in mechanical strength and heat resistance at elevated temperatures hinder their further application. To overcome these challenges, we present a novel approach to enhance the tensile strength and heat resistance of the NdFeB-bonded magnet involving the modification of thermoplastic polyurethane (TPU) through the melt-mixing method with a styrene-acrylonitrile-glycidyl methacrylate terpolymer (SAG) modifier and engineered TPU was then employed in fabricating NdFeB-bonded magnets via calendering molding. The microstructure of the magnets exhibited aligned NdFeB particles due to mechanical stress during calendering molding, which results in anisotropy. Interestingly, the magnetic properties of bonded magnets based on modified TPU remain almost the same compared to their unmodified counterparts, showcasing a maximum energy product of around 12 MGOe. The mechanical tests demonstrated a maximum 32.4% increase in the tensile strength of bonded magnets based on modified TPU. A progressive shift to a higher temperature (100 to 120 degrees C) of magnet samples fractured occurs in the heat resistance measurement of the bonded magnets based on modified TPU, meaning improvement in heat resistance of NdFeB bonded magnets. The development of modified TPU to improved thermal behaviors and mechanical properties of anisotropic neodymium-iron-born bonded magnet.image
Keyword ：
bonded magnet bonded magnet thermoplastic polyurethane thermoplastic polyurethane anisotropy anisotropy calendering molding calendering molding heat resistance heat resistance flexibility flexibility
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| GB/T 7714 | Qu, Zhongjie , Wu, Qiong , Yu, Kesong et al. Tensile and heat resistance behavior of modified thermoplastic polyurethane elastomer in anisotropic neodymium-iron-born bonded magnet [J]. | JOURNAL OF APPLIED POLYMER SCIENCE , 2023 , 141 (9) . |
| MLA | Qu, Zhongjie et al. "Tensile and heat resistance behavior of modified thermoplastic polyurethane elastomer in anisotropic neodymium-iron-born bonded magnet" . | JOURNAL OF APPLIED POLYMER SCIENCE 141 . 9 (2023) . |
| APA | Qu, Zhongjie , Wu, Qiong , Yu, Kesong , Wang, Zhanjia , Zhang, Mengkang , Yue, Ming et al. Tensile and heat resistance behavior of modified thermoplastic polyurethane elastomer in anisotropic neodymium-iron-born bonded magnet . | JOURNAL OF APPLIED POLYMER SCIENCE , 2023 , 141 (9) . |
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Abstract ：
Approach a trade-off between properties and cost for sintered Nd-Fe-B magnets in grain boundary diffusion (GBD) helps widen their application. In this study, we fabricated GBD Nd-Fe-B magnets via solid-liquid phase separation diffusion (SepD) with DyH3 nanopowder as the diffusion source. Investigations and comparisons with the traditional solid-liquid phase simultaneous diffusion (SimD) magnets were made regarding the liquid phase diffusion (LPD) temperature, magnetic characteristics, microstructures, diffusion coefficient, and domain morphology of SepD magnets. In addition, the cost was calculated and compared with TbH3 SepD magnets. It is determined that the optimal LPD temperature of DyH3 was 625 degrees C. Compared to the SimD magnet, Dy had a faster LPD rate in the SepD magnet, which leads to a deeper diffusion depth of 1200 & mu;m. Consequently, the SepD magnet develops more core-shell structures. Additionally, SepD could prevent the development of anti-core-shell formations in the magnet's surface region. As a result, the SepD magnet had higher comprehensive magnetic properties and coercivity temperature stability. Impressively, compared to TbH3 SepD magnets, the cost of per kOe coercivity enhancement for per kilogram magnets of DyH3 SepD magnets can be reduced by more than 50 %.
Keyword ：
Solid -liquid phase separation diffusion Solid -liquid phase separation diffusion Coercivity Coercivity Economy Economy Grain boundary diffusion Grain boundary diffusion DyH 3 nanopowder DyH 3 nanopowder Sintered Nd-Fe-B magnets Sintered Nd-Fe-B magnets
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| GB/T 7714 | Wu, Haihui , Wang, Zhanjia , Liu, Weiqiang et al. The strategy of solid-liquid phase separation diffusion with DyH3 to approach a trade-off between properties and cost for sintered Nd-Fe-B magnets [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2023 , 965 . |
| MLA | Wu, Haihui et al. "The strategy of solid-liquid phase separation diffusion with DyH3 to approach a trade-off between properties and cost for sintered Nd-Fe-B magnets" . | JOURNAL OF ALLOYS AND COMPOUNDS 965 (2023) . |
| APA | Wu, Haihui , Wang, Zhanjia , Liu, Weiqiang , Qin, Yuan , Ji, Ming , Du, RuiHua et al. The strategy of solid-liquid phase separation diffusion with DyH3 to approach a trade-off between properties and cost for sintered Nd-Fe-B magnets . | JOURNAL OF ALLOYS AND COMPOUNDS , 2023 , 965 . |
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Abstract ：
Nanocomposite permanent magnets have ultra-high theoretical magnetic energy products, due to cou-pling of the soft/hard magnetic phases, inciting strict microstructural requirements. In this study, the microstructure evolution, including the phase transition, morphological changes, and texture formation, of hot-deformed SmCo-based nanocomposites under thermal-stress-strain coupling was characterized to determine a possible strategy for achieving high performance. The SmCo5/alpha-Fe nanocomposites precursor contained fine and dispersed Sm(Fe, Co)5 and Fe-Co grains and exhibited a two-stage phase transforma-tion accompanied by grain growth. In the early stage of deformation at relatively low temperature, the adjacent Sm(Co, Fe)5 and Fe-Co phase formed the Sm2(Co, Fe)17-H phase, which was stable only with small grain sizes. In the high-temperature deformation stage, the Sm2(Co, Fe)17-H phase transformed into the Sm2(Co, Fe)17-R phase with large grain sizes. In addition, the strong c-axis texture formed in the Sm(Co, Fe)5 phase but not in the Sm2(Co, Fe)17-R phase. Subsequently, the phase transition process and texture formation mechanism were systematically analyzed by transmission electron microscopy. The ini-tiation of a slip system and/or preferential grain growth explained the formation of texture under the action of uniform stress and strain and assisted by dispersed Sm-rich nanograins. The Sm2(Co, Fe)17-R grains with poor orientations and large grain sizes did not achieve magnetic hardening, which also dam-age the magnetic properties. According to the results of this work, we also presented a new strategy to prepare high-performance SmCo-based nanocomposites magnets.(c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
Keyword ：
Nanocomposites Nanocomposites Phase transition Phase transition C-axis texture C-axis texture Microstructure Microstructure Hot deformation Hot deformation
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| GB/T 7714 | Teng, Yuan , Li, Yuqing , Xu, Xiaochang et al. Microstructure evolution of hot-deformed SmCo-based nanocomposites induced by thermo-mechanical processing [J]. | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2023 , 138 : 193-202 . |
| MLA | Teng, Yuan et al. "Microstructure evolution of hot-deformed SmCo-based nanocomposites induced by thermo-mechanical processing" . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 138 (2023) : 193-202 . |
| APA | Teng, Yuan , Li, Yuqing , Xu, Xiaochang , Yue, Ming , Liu, Weiqiang , Zhang, Dongtao et al. Microstructure evolution of hot-deformed SmCo-based nanocomposites induced by thermo-mechanical processing . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2023 , 138 , 193-202 . |
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Abstract ：
The difficulty of short-process bonded Nd-Fe-Bmagnetwaste recycling lies in the effective removal of the cured polymermatrix while protecting the magnetic powder. In this study, the polymermatrix in bonded Nd-Fe-B magnet waste was destroyedusing sodium hydroxide ethanol solution, and the effect of the recyclingprocess on the magnetic powders was studied. The nonmagnetic polymermatrix was removed, while the magnetic phase was not destroyed. Thecarbon and oxygen contents of the recycled magnetic powders decreasedby 92.96 and 89.30%, respectively, while the M (S) (saturation magnetization), M (r) (remanence), and H (cj) (coercivity) valuesof the recycled magnetic powders were 99.8, 98.5, and 95.9% of theoriginal magnetic powders, respectively. The curing and decompositionprocesses of the polymer matrix were also analyzed. During the curingprocess, dicyandiamide and bisphenol A epoxy resin acted as bridgesand skeletons, respectively, finally forming a thermosetting three-dimensionalnetwork structure. In the alkaline alcohol solution, the bridges andskeletons were destroyed by the free hydroxyl groups and free hydrogenradicals in ethanol, and small molecular products were dissolved inthe solution.
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| GB/T 7714 | Zhu, Peihong , Liu, Min , Yang, Yaxuan et al. Recycling Bonded Nd-Fe-B Magnet Wastes by Chemical Reaction and Its Mechanism [J]. | LANGMUIR , 2023 , 39 (30) : 10565-10575 . |
| MLA | Zhu, Peihong et al. "Recycling Bonded Nd-Fe-B Magnet Wastes by Chemical Reaction and Its Mechanism" . | LANGMUIR 39 . 30 (2023) : 10565-10575 . |
| APA | Zhu, Peihong , Liu, Min , Yang, Yaxuan , Liu, Weiqiang , Lu, Qingmei , Ding, Yue et al. Recycling Bonded Nd-Fe-B Magnet Wastes by Chemical Reaction and Its Mechanism . | LANGMUIR , 2023 , 39 (30) , 10565-10575 . |
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Abstract ：
Macroscopic magnetic properties of magnets strongly depend on the magnetization process and the microstructure of the magnets. Complex materials such as hard-soft exchange-coupled magnets or just real technical materials with impurities and inhomogeneities exhibit complex magnetization behavior. Here we investigate the effects of size, volume fraction, and surroundings of inhomogeneities on the magnetic properties of an inhomogeneous magnetic material via micromagnetic simulations. The underlying magnetization reversal and coercivity mechanisms are revealed. Three different demagnetization characteristics corresponding to the exchange coupling phase, semi-coupled phase, and decoupled phase are found, depending on the size of inhomogeneities. In addition, the increase in the size of inhomogeneities leads to a transition of the coercivity mechanism from nucleation to pinning. This work could be useful for optimizing the magnetic properties of both exchange-coupled nanomagnets and inhomogeneous single-phase magnets.
Keyword ：
multilayers multilayers permanent magnets permanent magnets exchange-coupling exchange-coupling micromagnetic simulation micromagnetic simulation
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| GB/T 7714 | Yang, Zhi , Chen, Yuanyuan , Liu, Weiqiang et al. Micromagnetic study of magnetization reversal in inhomogeneous permanent magnets [J]. | CHINESE PHYSICS B , 2023 , 32 (4) . |
| MLA | Yang, Zhi et al. "Micromagnetic study of magnetization reversal in inhomogeneous permanent magnets" . | CHINESE PHYSICS B 32 . 4 (2023) . |
| APA | Yang, Zhi , Chen, Yuanyuan , Liu, Weiqiang , Li, Yuqing , Cong, Liying , Wu, Qiong et al. Micromagnetic study of magnetization reversal in inhomogeneous permanent magnets . | CHINESE PHYSICS B , 2023 , 32 (4) . |
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Abstract ：
The application of rubber isotropic bonded magnets is limited due to low energy density, although it remains unbeatable in terms of price and production rate. In this paper, high-filled, flexible, and anisotropic NdFeB/ SmFeN bonded magnets were prepared using mixtures of fine SmFeN powders and coarse NdFeB powders by calendering molding. The optical microscope images show that adding fine SmFeN powder benefits processability, leading to higher loading while retaining flexibility. The magnetic property and microstructure of the magnets display the anisotropic magnetic property of NdFeB/SmFeN bonded magnets derived from the arrangement of the platelet-shaped NdFeB particles induced by mechanical stress during the calendaring process. To further optimize the magnetic properties of NdFeB/SmFeN bonded magnets, the NdFeB was sieved and then mixed with SmFeN to mold into sheets. Finally, the effect of NdFeB particle size on the magnetic and mechanical properties of NdFeB/SmFeN bonded magnets was investigated. The results showed that when the particle size of the NdFeB particle was 75-100 & mu;m, the magnetic properties of magnets reached the maximum value (Br = 7.77 KG, Hcj = 14.70 KOe, (BH)max = 12.70 MGOe) with density of 5.59 g/cm3. In addition, the tensile strength of the NdFeB/SmFeN bonded magnets increases and the sample standard deviation narrows with decreasing NdFeB particle size. This method provides a facile preparation for anisotropic bonded magnets with a new energy density record of rubber bonded rolled magnets prepared without an external field.
Keyword ：
Bonded hybrid magnet Bonded hybrid magnet Anisotropy Anisotropy Calendering molding Calendering molding Flexibility Flexibility High-filled degree High-filled degree
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| GB/T 7714 | Qu, Zhongjie , Wu, Qiong , Zhang, Mengkang et al. Facile preparation of bonded NdFeB/SmFeN hybrid magnets with flexibility, anisotropy and high energy density [J]. | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2023 , 584 . |
| MLA | Qu, Zhongjie et al. "Facile preparation of bonded NdFeB/SmFeN hybrid magnets with flexibility, anisotropy and high energy density" . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 584 (2023) . |
| APA | Qu, Zhongjie , Wu, Qiong , Zhang, Mengkang , Yue, Ming , Liu, Weiqiang . Facile preparation of bonded NdFeB/SmFeN hybrid magnets with flexibility, anisotropy and high energy density . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2023 , 584 . |
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Abstract ：
In recent years, calcium reduction diffusion has emerged as a new method for in situ regeneration of Nd-Fe-B sludge. In this work, rotation calcium thermal reduction diffusion technology was used for the first time to solve the issue of batch regeneration of Nd-Fe-B sludge to a certain extent, and regenerated Nd-Fe-B powder with uniform size and good dispensability was prepared. The effect of rotation rate on the properties of regenerated Nd-Fe-B powder was mainly studied. We found that the magnetic properties of the regenerated magnetic powder initially increased and then decreased with increasing rotation rate. When the rotation rate was 10 rpm, the magnetization of regenerated magnetic powder reached 138.22 emu/g, which was 10.2% higher than that of the purified sludge. The regenerated magnetic powder was doped with rare earth-rich alloy powder and high remanence alloy powder to control the composition, where the regenerated sintered magnet was prepared. The density reached 7.51 g/cm(3) and the maximum magnetic energy product reached 42.87 MGOe, laying a foundation for the short-process in situ regeneration of Nd-Fe-B sludge.
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| GB/T 7714 | Cong, Liying , Xu, Haibo , Lu, Qingmei et al. Effect of rotation rate on the recovery of Nd-Fe-B sludge via rotation-reduction diffusion method [J]. | AIP ADVANCES , 2023 , 13 (3) . |
| MLA | Cong, Liying et al. "Effect of rotation rate on the recovery of Nd-Fe-B sludge via rotation-reduction diffusion method" . | AIP ADVANCES 13 . 3 (2023) . |
| APA | Cong, Liying , Xu, Haibo , Lu, Qingmei , Yue, Ming . Effect of rotation rate on the recovery of Nd-Fe-B sludge via rotation-reduction diffusion method . | AIP ADVANCES , 2023 , 13 (3) . |
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Abstract ：
稀土是重要的战略性资源,在国防和民用高技术领域不可替代.我国长期作为全球稀土原料的主要提供者,面临着稀土储量下降、能源消耗过度和环境破坏严重等问题.而以烧结钕铁硼永磁的工业固废和城市矿产为代表的稀土二次资源量逐年增多,且富含稀土元素,成为我国乃至世界稀土的重要来源之一.因此,烧结钕铁硼永磁二次资源再利用技术备受关注.本文介绍了烧结钕铁硼永磁二次资源的形成过程及其特性,并介绍了现有的产业化回收技术和新技术的研究与发展.
Keyword ：
回收技术 回收技术 稀土永磁 稀土永磁 二次资源 二次资源 烧结钕铁硼 烧结钕铁硼
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| GB/T 7714 | 于立超 , 丛利颖 , 路清梅 et al. 烧结钕铁硼永磁二次资源再利用技术进展 [J]. | 稀土 , 2023 , 44 (4) : 71-90 . |
| MLA | 于立超 et al. "烧结钕铁硼永磁二次资源再利用技术进展" . | 稀土 44 . 4 (2023) : 71-90 . |
| APA | 于立超 , 丛利颖 , 路清梅 , 吴玉锋 , 岳明 . 烧结钕铁硼永磁二次资源再利用技术进展 . | 稀土 , 2023 , 44 (4) , 71-90 . |
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