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摘要 ：
To balance the utilization of rare-earth resources and reduce the preparation cost, the La and Ce substituted Nd2Fe14C hard magnetic alloys were prepared by a facile mechanochemical method for the first time. A two-step process is typically employed: 1) Decomposition of hydrocarbon and disproportionation of (Nd1-xREx)(2.5)Fe14B0.08 (RE=La or Ce, x=0-0.3) alloys during high-energy ball milling, Nd+Nd2Fe17+n-hexane -> NdH2+delta+alpha-Fe+Fe7C3; 2) (Nd, RE)(2)Fe14C hard magnetic powders were obtained via the vacuum annealing at 800 degrees C for 2 min. The phase relation, magnetic properties and microstructural evolution of (Nd, RE)(2)Fe14B0.08C0.92 (named Nd-RE-Fe-C-based) alloys were systematically investigated. Substitution of La for x=0.1 Nd in the Nd-RE-Fe-C-based alloy increase the coercivity from 15.6 kOe to 18.6 kOe without reducing the remanence. First-principles calculation was performed to study the mechanism of magnetic properties La and Ce substituted samples. The results showed that La tends to be expelled from 2:14:1 phase to form more minor phases which act as the domain wall pinning center, increasing the coercivity. However, Ce prefers to enter the 2:14:1 phase, diminishing the permanent magnetic properties due to the poor intrinsic magnetic properties. This paper provides a novel viewpoint for the effective utilization of high abundant rare earth and the investigation of low cost Nd2Fe14C permanent magnet materials.
关键词 ：
Mechanochemistry Mechanochemistry Magnetic materials Magnetic materials High abundant rare earth High abundant rare earth First-principles calculation First-principles calculation
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| GB/T 7714 | Shang, Xiaoyun , Wang, Xiangming , Chen, Min et al. High-abundant rare earth La/Ce substituted Nd2Fe14C based permanent magnet materials prepared by mechanochemical method [J]. | MATERIALS TODAY COMMUNICATIONS , 2024 , 41 . |
| MLA | Shang, Xiaoyun et al. "High-abundant rare earth La/Ce substituted Nd2Fe14C based permanent magnet materials prepared by mechanochemical method" . | MATERIALS TODAY COMMUNICATIONS 41 (2024) . |
| APA | Shang, Xiaoyun , Wang, Xiangming , Chen, Min , Tu, Haoran , Zhang, Hongguo , Yue, Ming et al. High-abundant rare earth La/Ce substituted Nd2Fe14C based permanent magnet materials prepared by mechanochemical method . | MATERIALS TODAY COMMUNICATIONS , 2024 , 41 . |
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摘要 ：
The effectiveness of employing La-Ca-Co co-doping has been demonstrated as the optimal approach for enhancing the magnetic performance of strontium ferrite. However, limited studies have explored the evolution of the magnetoplumbite phase and its correlation with the sintering temperature. In our research, La-Ca-Co doped strontium ferrite permanent magnets were fabricated using a conventional ceramic process and a two-step sintering technique. After sintering at different temperatures, all the samples possess proper c-axis orientation. When the sintering temperature was raised from 1175degree celsius to 1205 degree celsius, there was an upward trend observed in the remanence Br, increasing from 430 mT to 439 mT. The coercivity Hcj exhibited an increase from 380 kA/m and reached its peak at 397 kA/m at 1185degree celsius. Although the Br value remained favorable, the coercivity experienced substantial deterioration, reaching its lowest point at 303 kA/m at 1205degree celsius. Under a sintering temperature of 1195 degree celsius, magnetic performance with optimal energy product was achieved, with Br of 439 mT, H-cj of 379 kA/m, H-cb of 318 kA/m, and (BH)(max) of 35.5 kJm(-3).
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| GB/T 7714 | Haseeb, Muhammad , Zhang, Hongguo , Li, Yuqing et al. Sintering temperature optimization for enhanced magnetic performance in La-Ca-Co doped strontium ferrite [J]. | AIP ADVANCES , 2024 , 14 (2) . |
| MLA | Haseeb, Muhammad et al. "Sintering temperature optimization for enhanced magnetic performance in La-Ca-Co doped strontium ferrite" . | AIP ADVANCES 14 . 2 (2024) . |
| APA | Haseeb, Muhammad , Zhang, Hongguo , Li, Yuqing , Zhang, Pengjie , Geng, Zhaowen , Yue, Ming . Sintering temperature optimization for enhanced magnetic performance in La-Ca-Co doped strontium ferrite . | AIP ADVANCES , 2024 , 14 (2) . |
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摘要 ：
The advent of NdFeB bonded magnets with freedom of shape design is effective in achieving motor size and weight reductions. In this paper, the NdFeB bonded magnets were produced through calendaring molding, and the effect of powder shape on degree of alignment (DOA) of NdFeB bonded magnets was investigated. The magnetic measurement results demonstrate that platelet-shaped anisotropic Master Quality Authenticated (MQA) powders exhibit a significantly higher DOA compared to sphere-shaped anisotropic HDDR powders. Microstructural analysis reveals the presence of an oriented structure induced by mechanical stress in MQA bonded magnets, resulting in magnetic anisotropy. This observation is consistent with the difference in X-ray diffraction (XRD) patterns between the cross-section and surface of MQA bonded magnets. Conversely, spherical HDDR particles display minimal orientation and maintain a random distribution, resulting in magnetic isotropy. The XRD pattern of the cross-section of HDDR bonded magnets closely resembles that of its surface. In summary, our findings highlight the superior potential of platelet-shaped anisotropic MQA powders for achieving enhancing magnetic properties during the calendaring molding process, in contrast to sphere-shaped anisotropic HDDR powders. This study provides valuable insights into the determinants of mechanical particle orientation during the fabrication of anisotropic NdFeB bonded magnets, with implications for the development of high-performance bonded magnets.
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| GB/T 7714 | Qu, Zhongjie , Wu, Qiong , Zhang, Mengkang et al. The effect of powder shape on the magnetic anisotropy in NdFeB bonded magnets [J]. | AIP ADVANCES , 2024 , 14 (2) . |
| MLA | Qu, Zhongjie et al. "The effect of powder shape on the magnetic anisotropy in NdFeB bonded magnets" . | AIP ADVANCES 14 . 2 (2024) . |
| APA | Qu, Zhongjie , Wu, Qiong , Zhang, Mengkang , Wang, Zhanjia , Yue, Ming , Liu, Weiqiang . The effect of powder shape on the magnetic anisotropy in NdFeB bonded magnets . | AIP ADVANCES , 2024 , 14 (2) . |
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摘要 ：
A rotation coating technique was used to apply Zn layer onto MQP-S Nd-Fe-B spherical powders, aiming to enhance their anti -oxidation properties while maintaining their high magnetic performance. As the coating temperature increases and duration extends, the Zn layer thickness grows, subsequently leading to a reduction in powder magnetization primarily due to the introduction of nonmagnetic Zn. A certain level of degradation of the original Nd-Fe-B powders also occurs during coating, which appears to be relatively minor, as the powders ' coercivity remains almost unchanged after coating. All powders coated under different conditions effectively prevent further oxidation, maintaining almost unaltered magnetization during high -temperature tests. It demonstrates that rotation coating using lower melting point metals is a simple yet effective method to enhance the anti -oxidation capability of Nd-Fe-B powders. Moreover, this approach is easily scalable, which is important for applications in fabricating metal injection molding or bonded magnets.
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| GB/T 7714 | Xi, Wang , Zhang, Hongguo , Li, Meijun et al. The enhanced oxidation resistance of zinc-coated Nd-Fe-B spherical powders using a rotation coating technique [J]. | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2024 , 597 . |
| MLA | Xi, Wang et al. "The enhanced oxidation resistance of zinc-coated Nd-Fe-B spherical powders using a rotation coating technique" . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 597 (2024) . |
| APA | Xi, Wang , Zhang, Hongguo , Li, Meijun , Liu, Weiqiang , Yue, Ming . The enhanced oxidation resistance of zinc-coated Nd-Fe-B spherical powders using a rotation coating technique . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2024 , 597 . |
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摘要 ：
Due to its large magnetocrystalline anisotropy field and high Curie temperature, SmCo-based magnets are irreplaceable in high-temperature applications. The hot-deformed SmCo-based magnets are especially attractive for their excellent corrosion resistance, making them more suitable for harsh environments. However, it is still challenging for hot-deformed SmCo-based magnets to obtain high magnetization and high coercivity simultaneously. Therefore, it is necessary to analyze the relationship between its microstructure and magnetic properties and explore its magnetic hardening mechanism to guide the further improvement of magnetic properties. In this paper, the anisotropic heterostructure SmCo5 magnet was prepared by combining large height-reduction and introducing a nano-grained Smrich phase. Strong c-axis texture, (BH)(m) of 16.1 MGOe, and H-ci of 9.6 kOe were obtained via the heterostructure with SmCo5 micron-grain and Sm-rich nano-scale precipitates. The magnetic domain observation and technical magnetization analysis demonstrate that the coercivity mechanism is dominated by nucleation. The results also show that the smooth and Sm-rich precipitated grain boundary provides weak pinning effects. It provides a reference for the development of high-performance nanocrystalline SmCo5 magnets.
关键词 ：
Rare earths Rare earths Hot-deformed SmCo magnet Hot-deformed SmCo magnet Heterostructure Heterostructure Coercivity mechanism Coercivity mechanism Permanent magnet Permanent magnet
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| GB/T 7714 | Teng, Yuan , Li, Yuqing , Liu, Weiqiang et al. Coercivity mechanism of high-performance anisotropic heterostructure SmCo5 magnets [J]. | JOURNAL OF RARE EARTHS , 2024 , 42 (10) : 1882-1888 . |
| MLA | Teng, Yuan et al. "Coercivity mechanism of high-performance anisotropic heterostructure SmCo5 magnets" . | JOURNAL OF RARE EARTHS 42 . 10 (2024) : 1882-1888 . |
| APA | Teng, Yuan , Li, Yuqing , Liu, Weiqiang , Xu, Xiaochang , Wang, Zhanjia , Yang, Jianjun et al. Coercivity mechanism of high-performance anisotropic heterostructure SmCo5 magnets . | JOURNAL OF RARE EARTHS , 2024 , 42 (10) , 1882-1888 . |
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摘要 ：
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.
关键词 ：
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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摘要 ：
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.
关键词 ：
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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摘要 ：
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.
关键词 ：
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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摘要 ：
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.
关键词 ：
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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摘要 ：
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.
关键词 ：
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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