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学者姓名：岳明
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Abstract ：
The application of bulk nanocrystalline Nd-Fe-B permanent magnets manufactured by hot deformation methods was severely limited by production efficiency. Therefore, this work proposed an efficient preparation method combining hot rolling and deformation. Using the melt-spun Nd-Fe-B magnetic powders as original materials, dense, large-sized, and well-uniform precursors for deformation can be obtained through cold pressing and hot rolling. The large-sized hot-rolled magnet can be cut into small pieces and subjected to hot deformation. The deformed magnet exhibits obvious crystallographic anisotropy, and the optimal maximum energy product can reach 35.7 MGOe. Furthermore, the mechanism of deformation and texture formation has been systematically studied, according to the microstructure and texture characterization of different height reduction magnets. The results indicated that there was a typical heterogeneous structure in the hot-rolled and hot-deformed Nd-Fe-B magnets. Dissolution precipitation, grain growth, and regular grain arrangement were the main reasons for deformation and texture formation during the deformation process. Our strategy of replacing traditional hot-pressing with large-sized hot-rolling can produce massively deformed precursors at once, greatly improving production efficiency, which is crucial for promoting the application of bulk nanocrystalline anisotropic Nd-Fe-B permanent magnets. (c) 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
Keyword ：
Deformation behavior Deformation behavior Hot deformation Hot deformation Magnetic properties Magnetic properties Anisotropic Nd-Fe-B magnet Anisotropic Nd-Fe-B magnet Hot rolling Hot rolling
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| GB/T 7714 | Li, Qian , Liu, Lingqi , Li, Yuqing et al. New strategy for efficient manufacturing of bulk anisotropic nanocrystalline Nd-Fe-B permanent magnets [J]. | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2024 , 201 : 119-129 . |
| MLA | Li, Qian et al. "New strategy for efficient manufacturing of bulk anisotropic nanocrystalline Nd-Fe-B permanent magnets" . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 201 (2024) : 119-129 . |
| APA | Li, Qian , Liu, Lingqi , Li, Yuqing , Yue, Ming , Teng, Yuan , Liu, Weiqiang et al. New strategy for efficient manufacturing of bulk anisotropic nanocrystalline Nd-Fe-B permanent magnets . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2024 , 201 , 119-129 . |
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Abstract ：
The precipitation-hardened Sm-Co permanent magnets relied on the pinning of nanocellular structures to achieve high coercivity, and have an irreplaceable position in high-temperature applications. In this article, by employing micromagnetic simulations and magnetic domain observations, the pinning behavior of lamellar phases (Zphase) were investigated, which has not been well understood before. The results showed that the Z-phase can serve as a strong pinning position, but due to the parallel lamellar distribution, the magnetic domain walls can move around. Additionally, the effect of Z-phase on coercivity was achieved by changing the morphology of magnetic domain walls during magnetization reversal. For attractive pinning, the coercivity was reduced by the Z-phase, while for repulsive pinning, the Z-phase increased the coercivity when gamma Z<0.54 gamma H. Our findings can provide a novel understanding of the coercivity mechanism of precipitation-hardened Sm-Co permanent magnets.
Keyword ：
Magnetization reversal Magnetization reversal Pinning Pinning Magnetic domain Magnetic domain Permanent magnet Permanent magnet Micromagnetic simulation Micromagnetic simulation
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| GB/T 7714 | Li, Yuqing , Liu, Manying , Zhang, Dongtao et al. Lamellar Zr-rich phase and its influence on coercivity for Sm(CoFeCuZr) z magnets [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2024 , 1009 . |
| MLA | Li, Yuqing et al. "Lamellar Zr-rich phase and its influence on coercivity for Sm(CoFeCuZr) z magnets" . | JOURNAL OF ALLOYS AND COMPOUNDS 1009 (2024) . |
| APA | Li, Yuqing , Liu, Manying , Zhang, Dongtao , Zhang, Lele , Wu, Qiong , Xia, Weixing et al. Lamellar Zr-rich phase and its influence on coercivity for Sm(CoFeCuZr) z magnets . | JOURNAL OF ALLOYS AND COMPOUNDS , 2024 , 1009 . |
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Abstract ：
The highly efficient and green recycling of sintered Nd-Fe-B sludge has emerged as a pressing concern in light of the escalating production of sludge. In this work, a novel ultra-short process strategy of purification-remixing incorporation is proposed for in-situ regeneration across several types of Nd-Fe-B sludges. The magnetic properties of the regenerated magnets are effectively restored by remixing the purified sludge at 30 wt% into customized high-remanence magnetic powder, followed by the adjustment of rare earth content to 30.5 % using rare earth-rich compounds. For magnets using 48SH sludge, the remanence and coercivity are recovered to 13.8 kG and 22.2 kOe, respectively, with recovery rates of 97 % and 108.3 %, which are almost as high as those of the original magnets. The temperature stability of the magnet is comparable to that of the original magnet as well. The comprehensive analysis attributes the attainment of high-performance to the repair and optimization of the microstructure, particularly focusing on the grain boundary phase.The ultra-short recovery process and the reuse of solvents in the purification phase minimize the total energy consumption and carbon emissions, and show great potential for green recycling for Nd-Fe-B sludge.
Keyword ：
Nd-Fe-B sludge Nd-Fe-B sludge In-situ regeneration In-situ regeneration Ultra-short process Ultra-short process Separation and purification Separation and purification
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| GB/T 7714 | Yu, Lichao , Lu, Qingmei , Yang, Xinyuan et al. New strategy for the ultra-short process regeneration of sintered Nd-Fe-B sludge via purification-remixing incorporation [J]. | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 350 . |
| MLA | Yu, Lichao et al. "New strategy for the ultra-short process regeneration of sintered Nd-Fe-B sludge via purification-remixing incorporation" . | SEPARATION AND PURIFICATION TECHNOLOGY 350 (2024) . |
| APA | Yu, Lichao , Lu, Qingmei , Yang, Xinyuan , Liu, Weiqiang , Dong, Gaihua , Huang, Shulin et al. New strategy for the ultra-short process regeneration of sintered Nd-Fe-B sludge via purification-remixing incorporation . | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 350 . |
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Abstract ：
The grinding sludge of grain boundary diffusion Nd-Fe-B magnet is rich in heavy rare earth and has a typical core-shell microstructure. In this work, an ultra-short process was developed to realize green, in-situ regeneration of the sludge and efficient reuse of heavy rare earth elements. The regenerated magnets showed excellent magnetic performance and good temperature stability which were fabricated after the purification of sludge, composition regulation with rare earth-rich compounds, Nd42.1FebalB0.79, NdHx, (PrNd)H-x, and sintering. Especially, the magnet prepared by using Nd42.1FebalB0.79 alloy had significant property recovery, where remanence and coercivity were restored to 12.8 kG, and 20.6 kOe, respectively, reaching 97.7 % and 162.5 % of the original magnet. The magnetization reversal behavior and the coercivity mechanism were analyzed to keep the nucleation mechanism, and the high coercivity stemmed from the repair and optimization of the grain boundary by introducing rare earth-rich alloys, the full utilization of heavy rare earth elements, and the core-shell microstructure rooted in the sludge as well.
Keyword ：
Nd-Fe-B sludge Nd-Fe-B sludge In-situ regeneration In-situ regeneration Ultra-short process Ultra-short process HRE HRE
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| GB/T 7714 | Yu, Lichao , Lu, Qingmei , Cong, Liying et al. Achieving high-performance regeneration of grain boundary diffusion Nd-Fe-B sludge via an ultra-short process [J]. | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2024 , 610 . |
| MLA | Yu, Lichao et al. "Achieving high-performance regeneration of grain boundary diffusion Nd-Fe-B sludge via an ultra-short process" . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 610 (2024) . |
| APA | Yu, Lichao , Lu, Qingmei , Cong, Liying , Yang, Xinyuan , Liu, Weiqiang , Dong, Gaihua et al. Achieving high-performance regeneration of grain boundary diffusion Nd-Fe-B sludge via an ultra-short process . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2024 , 610 . |
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Abstract ：
Hard magnetic materials based on SmCo5, known for their high coercivity, have found extensive applications in advanced technologies. To further enhance their magnetic performance, it is advantageous to reduce the particle size slightly below the single-domain limit and modify the shape to a one-dimensional (1D) structure. Here, two strategies were introduced with the aim to synthesize the anisotropic SmCo5 nanostructured magnetic powder. The first approach involving electrospinning and reduction-diffusion failed to generate the desired one-dimensional structure, resulting in zero-dimensional (0D) SmCo5 spherical particles with a coercivity of 34.5 kOe and a maximum magnetic energy product of 14 MGOe. In contrast, the second approach, which combines the modified polyol process with reduction-diffusion, yielded a SmCo5 magnetic powder with two distinct morphologies: zero-dimensional spherical particles and one-dimensional nanofibers. The SmCo5 magnetic powder synthesized by the second method exhibits a coercivity of 47.2 kOe and a maximum magnetic energy product of 17 MGOe, significantly exceeding those reported for zero-dimensional spherical SmCo5 nanoparticles. This high-performance SmCo5 magnetic powder holds considerable promise for high-density data storage and permanent magnet applications. Moreover, it provides avenues for developing exchange-coupled nanocomposite magnets with a high energy density. The findings of this study may serve as the foundation for exploiting anisotropic SmCo5 nanomagnets and hold significant implications for the design of advanced magnetic materials using the reduction-diffusion method.
Keyword ：
rare-earth permanent magnets rare-earth permanent magnets anisotropy anisotropy SmCo5 SmCo5 coercivity coercivity chemical synthesis chemical synthesis
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| GB/T 7714 | Yang, Zhi , Wang, Yatao , Xu, Haibo et al. Strategies for the Synthesis of Nanostructured SmCo5 Magnetic Particles for Permanent Magnetic Application [J]. | ACS APPLIED NANO MATERIALS , 2024 , 7 (4) : 4252-4263 . |
| MLA | Yang, Zhi et al. "Strategies for the Synthesis of Nanostructured SmCo5 Magnetic Particles for Permanent Magnetic Application" . | ACS APPLIED NANO MATERIALS 7 . 4 (2024) : 4252-4263 . |
| APA | Yang, Zhi , Wang, Yatao , Xu, Haibo , Wu, Qiong , Zhang, Hongguo , Liu, Weiqiang et al. Strategies for the Synthesis of Nanostructured SmCo5 Magnetic Particles for Permanent Magnetic Application . | ACS APPLIED NANO MATERIALS , 2024 , 7 (4) , 4252-4263 . |
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Abstract ：
The synthesis of size-controlled Sm2Fe17 magnetic particles is a prerequisite for the fabrication of highperformance Sm2Fe17N3 permanent magnetic materials. Here, Sm2Fe17 was synthesized using a costeffective reduction-diffusion method. The calcium chloride molten salt was introduced to control the particle size and achieve a single phase of Sm2Fe17. The effects of reduction-diffusion reaction temperature and the amount of added calcium chloride on the phase constitution and microstructure of the final product of reduction-diffusion were systematically investigated. Adding an appropriate amount of calcium chloride can effectively inhibit the overgrowth and sintering of the reduced particles. By employing the strategy of adding 20 wt% of calcium chlorides into the green compacts, we were able to successfully synthesize uniform Sm2Fe17 particles that are well-dispersed, with an average size of 2.2 mm. Furthermore, by combining the optimal reduction-diffusion conditions and the nitriding process, the hard magnetic Sm2Fe17N3 material was successfully obtained. This study could be useful for the development of high-performance Sm2Fe17N3 magnetic materials utilizing reduction-diffusion technology. (c) 2023 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
Keyword ：
Molten salt Molten salt Permanent magnets Permanent magnets Rare earths Rare earths Reduction-diffusion Reduction-diffusion
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| GB/T 7714 | Xi, Junhua , Yang, Zhi , Haseeb, Muhammad et al. Synthesis of size-controlled and dispersible Sm2Fe17N3 magnetic particles by reduction diffusion process using molten salt* [J]. | JOURNAL OF RARE EARTHS , 2024 , 42 (11) : 2105-2111 . |
| MLA | Xi, Junhua et al. "Synthesis of size-controlled and dispersible Sm2Fe17N3 magnetic particles by reduction diffusion process using molten salt*" . | JOURNAL OF RARE EARTHS 42 . 11 (2024) : 2105-2111 . |
| APA | Xi, Junhua , Yang, Zhi , Haseeb, Muhammad , Chen, Yuanyuan , Nie, Xiaofeng , Cong, Liying et al. Synthesis of size-controlled and dispersible Sm2Fe17N3 magnetic particles by reduction diffusion process using molten salt* . | JOURNAL OF RARE EARTHS , 2024 , 42 (11) , 2105-2111 . |
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Abstract ：
As a new technology for the short-process recovery of Nd-Fe-B sintered magnet sludge, the calcium thermal reduction diffusion method has attracted significant attention due to its low energy consumption, environmental friendliness, and high recovery rate. However, traditional calcium thermal reduction diffusion technology still has issues such as an insufficient reaction between the sludge and reducing agent after increasing the amount of reactants, the use of a large amount of reducing agent, and low recovery efficiency. Therefore, a novel dynamic calcium thermal reduction diffusion technology was proposed, with the calcium reduction diffusion of sludge and calcium undergoing a continuous mixing and diffusion state throughout the entire process, greatly improving the efficiency of the reaction. Compared with the traditional process, the amount of reactants was increased from a few grams to hundreds of grams, and the amount of reducing agent calcium was reduced by 25%. Subsequently, regenerated magnetic powder with a uniform particle size, good dispersion, and excellent magnetic properties was obtained. The saturation magnetization under a 3 T magnetic field was increased by 27.9% compared with the initial sludge. The maximum magnetic energy product of the magnet prepared by doping 50 wt% regenerated magnetic powder was 45 MGOe, which reached the highest level of the regenerated magnets prepared by recycling sludge. What is encouraging that this new technology had the advantage of achieving large-scale production and reducing production costs, providing a potential industrialization solution for the green and efficient recovery of Nd-Fe-B sintered magnet sludge.
Keyword ：
Large-scale production Large-scale production Dynamic Dynamic Nd-Fe-B sintered magnet sludge Nd-Fe-B sintered magnet sludge Calcium thermal reduction diffusion Calcium thermal reduction diffusion Short -process recovery Short -process recovery
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| GB/T 7714 | Cong, Liying , Xu, Haibo , Lu, Qingmei et al. An efficient process for preparing regenerated magnets by dynamic recovery of Nd-Fe-B sintered magnet sludge [J]. | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING , 2024 , 12 (2) . |
| MLA | Cong, Liying et al. "An efficient process for preparing regenerated magnets by dynamic recovery of Nd-Fe-B sintered magnet sludge" . | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 12 . 2 (2024) . |
| APA | Cong, Liying , Xu, Haibo , Lu, Qingmei , Yu, Lichao , Zhou, Quangui , Wu, Qiong et al. An efficient process for preparing regenerated magnets by dynamic recovery of Nd-Fe-B sintered magnet sludge . | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING , 2024 , 12 (2) . |
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Abstract ：
M-type ferrite exhibits good magnetic characteristics and resistance to oxidation, enabling the production of stable nanoparticles for applications such as medical delivery, hyperthermia therapy, and magnetic recording. Additionally, it serves as a valuable tool for studying the theory of coercivity. Here, the impact of surface and size on coercivity and associated mechanisms in M-type hexagonal ferrites has been thoroughly analyzed by a combination of micromagnetic models and experimental investigations. Based on a cubic model and without considering surface defects, the coercivity still cannot reach the theoretical value. It decreases with an increase in particle size, and the quasi-coherent and quasi-flower reversal modes appear continuously. Besides, surface defects do not affect the reversal mode, but they do decrease the coercivity and magnetic hardening effect, hence further amplifying the difference between coercivity and its theoretical value. The simulation results are strongly supported by experimental data. This study extensively examines the coercivity of M-type ferrite particles produced by various preparation methods, taking into account experimental observations and simulation results. Our findings can serve as guidance for the development of preparation technology for permanent magnet nanoparticles and contribute to a deeper understanding of the contradictions in coercivity and the mechanisms of magnetization reversal.
Keyword ：
Magnetization reversal mechanism Magnetization reversal mechanism Coercivity Coercivity Surface defects Surface defects Micromagnetic simulations Micromagnetic simulations Hexagonal ferrites Hexagonal ferrites
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| GB/T 7714 | Haseeb, M. , Li, Y. Q. , Zhang, H. G. et al. Influence and mechanism of surface defects on coercivity of M-type ferrite particles [J]. | SURFACES AND INTERFACES , 2024 , 46 . |
| MLA | Haseeb, M. et al. "Influence and mechanism of surface defects on coercivity of M-type ferrite particles" . | SURFACES AND INTERFACES 46 (2024) . |
| APA | Haseeb, M. , Li, Y. Q. , Zhang, H. G. , Liu, W. Q. , Zhang, P. J. , Yue, M. . Influence and mechanism of surface defects on coercivity of M-type ferrite particles . | SURFACES AND INTERFACES , 2024 , 46 . |
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Abstract ：
The grain boundary diffusion (GBD) technology effectively utilizes heavy rare earth (HRE) elements to improve the coercivity of sintered Nd-Fe-B magnet. Significantly, clarifying its coercivity improvement mechanism is essential for further optimizing the process and performance. Through comparative analysis with commercial conventional magnets (CSH) processing equivalent coercivity, this study investigated the specific mechanism by which the GBD method enhances the coercivity of HRE elements in an efficient manner. To achieve the same coercivity (similar to 21.4 kOe), GBD magnets contained only 0.25 wt% Tb, whereas CSH magnets had 1.17 wt% Dy and 1.18 wt% Tb. The microstructure analysis revealed that the Tb element in the GBD magnet was concentrated in the outer layer of the grain, constituting 17.37 wt% of the total rare earth content. While, in CSH magnets, the HRE element in the main phase grains accounted for only 9.58 wt% of the total rare earth elements, including Dy (3.83 wt%) and Tb (5.75 wt%). The characteristic core-shell structural grains in GBD magnet also endowed it with an uneven magnetic domain structure and a more concentrated "abrupt" magnetization reversal. Based on the characterization results the nucleation positions of the two types of magnets were analyzed by fitting H-ci/M-s and H-a/M-s. The results can serve as a guide for enhancing coercivity in grain boundary diffusion sintered Nd-Fe-B magnets, aiding in process and property optimization, and advancing the understanding of nucleation type mechanisms.
Keyword ：
Sintered Nd-Fe-B magnets Sintered Nd-Fe-B magnets Grain boundary diffusion Grain boundary diffusion Microstructure Microstructure Coercivity Coercivity Domain structure Domain structure
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| GB/T 7714 | Wu, Haihui , Li, Yuqing , Liu, Weiqiang et al. Understanding the coercivity enhancement mechanism of grain boundary diffused Nd-Fe-B magnets by comparing with commercial equivalent coercivity magnets [J]. | MATERIALS CHARACTERIZATION , 2024 , 210 . |
| MLA | Wu, Haihui et al. "Understanding the coercivity enhancement mechanism of grain boundary diffused Nd-Fe-B magnets by comparing with commercial equivalent coercivity magnets" . | MATERIALS CHARACTERIZATION 210 (2024) . |
| APA | Wu, Haihui , Li, Yuqing , Liu, Weiqiang , Wang, Zhanjia , Qin, Yuan , Ji, Ming et al. Understanding the coercivity enhancement mechanism of grain boundary diffused Nd-Fe-B magnets by comparing with commercial equivalent coercivity magnets . | MATERIALS CHARACTERIZATION , 2024 , 210 . |
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Abstract ：
The Electrophoretic deposition grain boundary diffusion (EPD-GBD) technology for sintered Nd-Fe-B magnets has garnered significant attention. In this study, TbF3 3 nano-powders were synthesized via sand milling (SM) process, and the optimal processes were subsequently explored. Notably, the SM powders exhibit two morphologies: blocky and flocculent. With prolonged SM time, the proportion of larger blocky powders decreases gradually, while the proportion of smaller flocculent powders increases. The morphology and proportion of the powders significantly impact the EPD rate and the effectiveness of GBD. Higher blocky powders proportion improved diffusion, reducing residual Tb layer and enhancing magnet coercivity. Higher flocculent powders proportion caused cracking, poor diffusion, thicker residual layer, and lower coercivity. However, a high EPD rate was achieved with a high proportion of flocculent powders. Considering both EPD rate and diffusion effect, the SM process at 1500 r/min for 30 minutes was identified as the optimal parameter. The TbF3 3 nano-powders prepared by these conditions exhibited superior advantage in the EPD process and the coercivity of GBD magnets compared to traditional micron-scale TbF3 3 powders, demonstrating the benefits of the SM process in the EPD and GBD processes of Nd-Fe-B magnets.
Keyword ：
Grain boundary diffusion Grain boundary diffusion TbF3 TbF3 Nd-Fe-B magnets Nd-Fe-B magnets Electrophoretic deposition Electrophoretic deposition Sand Milling Sand Milling
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| GB/T 7714 | Ji, Ming , Liu, Weiqiang , Wang, Zhanjia et al. Application of TbF3 3 Nano-powders by sand milling process in preparing high performance grain boundary diffusion Nd-Fe-B magnets [J]. | MATERIALS TODAY COMMUNICATIONS , 2024 , 41 . |
| MLA | Ji, Ming et al. "Application of TbF3 3 Nano-powders by sand milling process in preparing high performance grain boundary diffusion Nd-Fe-B magnets" . | MATERIALS TODAY COMMUNICATIONS 41 (2024) . |
| APA | Ji, Ming , Liu, Weiqiang , Wang, Zhanjia , Fan, Min , Wu, Haihui , Du, Ruihua et al. Application of TbF3 3 Nano-powders by sand milling process in preparing high performance grain boundary diffusion Nd-Fe-B magnets . | MATERIALS TODAY COMMUNICATIONS , 2024 , 41 . |
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