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学者姓名：张东涛
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摘要 ：
Effect of hydrogen pressure on hydrogenation and pulverization behavior of Sm(CoFeCuZr)7.6 alloy prepared by plate mold (PM) and strip casting (SC) has been systematically investigated. Increasing hydrogen pres-sure can improve the hydrogenation ability. Both the PM and SC have the similar hydrogen absorption process, which can be divided into two stages. The first stage follows the Sieverts' law (1-5 MPa) while the second one deviates from the Sieverts' law (5-10 MPa). Rietveld refinement shows that the hydrogen ab-sorption causes different lattice distortion of different phases without changing the phase structure. The internal stress caused by such lattice distortion is the primary reason that accelerates the pulverization of the alloys, and increasing hydrogen pressure can lead to the decrease of particle size of the PM and SC alloys. The hydrogen decrepitation (HD) process are studied in detail based on these results. The hydrogen ab-sorption mechanism of Sm(CoFeCuZr)7.6 alloy can be regarded as a hydrogen dissolution process without phase transformation. In addition, the existence of a large amount of fine grains in the SC has an adverse effect on the alignment, which can be optimized by taking effective methods to reduce the overcooling rate. This work proves that the SC, HD and jet milling process can be a promising new approach to powder preparation for high-performance Sm(CoFeCuZr)z sintered magnets.(c) 2022 Elsevier B.V. All rights reserved.
关键词 ：
Hydrogen pressure Hydrogen pressure Hydrogenation behavior Hydrogenation behavior Sm(CoFeCuZr)z magnets Sm(CoFeCuZr)z magnets Alignment characteristics Alignment characteristics Pulverization behavior Pulverization behavior Hydrogenation mechanism Hydrogenation mechanism
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| GB/T 7714 | Yang, Jianjun , Zhang, Dongtao , Zhang, Hongguo et al. Effect of hydrogen pressure on hydrogenation and pulverization behavior of Sm(CoFeCuZr)z ingot and strip casting flake [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2023 , 930 . |
| MLA | Yang, Jianjun et al. "Effect of hydrogen pressure on hydrogenation and pulverization behavior of Sm(CoFeCuZr)z ingot and strip casting flake" . | JOURNAL OF ALLOYS AND COMPOUNDS 930 (2023) . |
| APA | Yang, Jianjun , Zhang, Dongtao , Zhang, Hongguo , Shang, Zhifeng , Wang, Hong , Meng, Chengzhen et al. Effect of hydrogen pressure on hydrogenation and pulverization behavior of Sm(CoFeCuZr)z ingot and strip casting flake . | JOURNAL OF ALLOYS AND COMPOUNDS , 2023 , 930 . |
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摘要 ：
Microstructure and magnetic properties were studied for the commercial Sm(CoFeCuZr)z magnets before and after post annealing treatment. The results show that the phases composition and orientation of the magnet do not change after post annealing treatment, but the substantial redistribution of Cu element within multiscale (the microscale crystal grain and the nanoscale cellular structure) is observed simul-taneously. In detail, along with the Cu redistribution, the thickness of the Cu-rich Sm(Co,Cu)5 cell boundary becomes thinner, and the Cu concentration in the boundary increases sharply. The pinning field of domain walls and corresponding coercivity increase remarkably with slight remanence and maximum energy product loss, and the overall magnetic performance of (BH)max (MGOe) thorn Hcj (kOe) increases by 54.3% as a result. Moreover, the thermal stability of the magnet improves as well. On the other hand, Cu-lean phenomenon was observed along the grain boundary region, triggering to magnetic domain reversal process and slightly undermining the squareness of the demagnetization curve of the magnet.(c) 2021 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.
关键词 ：
Magnetic properties Magnetic properties Rare earth permanent magnets Rare earth permanent magnets Post annealing treatment Post annealing treatment Cu distribution Cu distribution Sm(CoFeCuZr) Z magnets Sm(CoFeCuZr) Z magnets
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| GB/T 7714 | Yang, Jianjun , Zhang, Dongtao , Xie, Zhihong et al. Tremendous enhancement of magnetic performance for Sm(CoFeCuZr)z magnet based on multiscale copper redistribution* [J]. | JOURNAL OF RARE EARTHS , 2022 , 40 (10) : 1592-1597 . |
| MLA | Yang, Jianjun et al. "Tremendous enhancement of magnetic performance for Sm(CoFeCuZr)z magnet based on multiscale copper redistribution*" . | JOURNAL OF RARE EARTHS 40 . 10 (2022) : 1592-1597 . |
| APA | Yang, Jianjun , Zhang, Dongtao , Xie, Zhihong , Shang, Zhifeng , Li, Yuqing , Liu, Weiqiang et al. Tremendous enhancement of magnetic performance for Sm(CoFeCuZr)z magnet based on multiscale copper redistribution* . | JOURNAL OF RARE EARTHS , 2022 , 40 (10) , 1592-1597 . |
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摘要 ：
A novel hot extrusion method to fabricate anisotropic nanocrystalline SmCo5 magnet was investigated. The results indicate that the hot-extruded (HE) SmCo5 magnet obtains a strong c-axis texture in perpendicular to the extrusion direction, but the texture strength is clearly different in different regions. The deformation degree plays a key role in the formation of c-axis crystallographic texture and magnetic anisotropy. In surface region of the HE magnet, the deformation degree of grains is the biggest, and the c-axis texture and remanence are the strongest. Furthermore, deformation mechanism of the HE SmCo5 magnet was preliminarily discussed.
关键词 ：
nanocrystalline nanocrystalline Anisotropic SmCo5 magnet Anisotropic SmCo5 magnet hot extrusion hot extrusion deformation mechanism deformation mechanism
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| GB/T 7714 | Wang, Hong , Zhang, Dongtao , Tang, Yuyang et al. Anisotropic Nanocrystalline SmCo5 Permanent Magnet Prepared by Hot Extrusion [J]. | IEEE TRANSACTIONS ON MAGNETICS , 2022 , 58 (2) . |
| MLA | Wang, Hong et al. "Anisotropic Nanocrystalline SmCo5 Permanent Magnet Prepared by Hot Extrusion" . | IEEE TRANSACTIONS ON MAGNETICS 58 . 2 (2022) . |
| APA | Wang, Hong , Zhang, Dongtao , Tang, Yuyang , Yang, Jianjun , Li, Yuqing , Liu, Weiqiang et al. Anisotropic Nanocrystalline SmCo5 Permanent Magnet Prepared by Hot Extrusion . | IEEE TRANSACTIONS ON MAGNETICS , 2022 , 58 (2) . |
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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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摘要 ：
The high-temperature oxidation resistance is a critical evaluation index for the practical applications of Nd-Fe-B sintered magnets. In this paper, the high temperature (> 523 K) oxidation behavior of the recycled Nd-Fe-B sintered magnets was investigated and compared with the original magnets. The results show that both magnets exhibit similar high-temperature oxidation characteristics. The recycled magnets oxidized after 300 h at 673 K possesses remanence (B-r) of 1.189 T, coercivity (H-ci) of 1688 kA/m, and maximum energy product [(BH)(max)] of 268 kJ/m(3). Compared with the recycled magnet before oxidizing, the oxidized recycled magnets retain 96.0% of B-r, 85.2% of H-ci, and 92.2% of (BH)(max), respectively. The recycled magnets negatively influence the high-temperature oxidation resistance compared with the original magnets, demonstrating the recycled magnets' applicability. (C) 2021 Published by Elsevier B.V.
关键词 ：
High-temperature oxidation High-temperature oxidation Oxidation mechanism Oxidation mechanism Oxidation rate Oxidation rate Recycled Nd-Fe-B sintered magnets Recycled Nd-Fe-B sintered magnets
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| GB/T 7714 | Li, X. T. , Liu, W. Q. , Yue, M. et al. The evaluation of high-temperature oxidation for the original and recycled Nd-Fe-B sintered magnets [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 884 . |
| MLA | Li, X. T. et al. "The evaluation of high-temperature oxidation for the original and recycled Nd-Fe-B sintered magnets" . | JOURNAL OF ALLOYS AND COMPOUNDS 884 (2021) . |
| APA | Li, X. T. , Liu, W. Q. , Yue, M. , Liu, Y. H. , Zha, S. S. , Yi, X. F. et al. The evaluation of high-temperature oxidation for the original and recycled Nd-Fe-B sintered magnets . | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 884 . |
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摘要 ：
Specially designed SmCo5/Co magnetic nanocomposites have been fabricated by a "bottom up" process. SmCo5 nanochips were first prepared by solution-phase chemical synthesis combined with reductive annealing and then coated by chemical deposition of Co nanorods. Both the SmCo5 nanochips and Co nanorods are anisotropic and could be simultaneously aligned under the external magnetic field. Magnetic measurements applied on these "bi-anisotropic" SmCo5/Co composites show high magnetic performance with the Co phase content in a wide range from 10 to 80 wt %. For the first time ever, the applicable exchange-coupled nanocomposites with a rare-earth content lower than 7 wt % was realized, which exhibits the coercivity close to 10 kOe and remanence 31% larger than that of single phase SmCo5. 3-D micromagnetic simulations were performed to reveal that the reversal mechanism in the Co phase was transferred from the incoherent mode to the coherent mode under a tip interface exchange-coupling with a SmCo5 surface.
关键词 ：
anisotropy anisotropy low rare-earth content low rare-earth content nanocomposite nanocomposite OOMMF OOMMF permanent magnet permanent magnet SmCo5/Co SmCo5/Co
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| GB/T 7714 | Wu Qiong , Ma Xiangyu , Yue Ming et al. Tip Interface Exchange-Coupling Based on "Bi-Anisotropic" Nanocomposites with Low Rare-Earth Content. [J]. | ACS applied materials & interfaces , 2021 , 13 (11) : 13548-13555 . |
| MLA | Wu Qiong et al. "Tip Interface Exchange-Coupling Based on "Bi-Anisotropic" Nanocomposites with Low Rare-Earth Content." . | ACS applied materials & interfaces 13 . 11 (2021) : 13548-13555 . |
| APA | Wu Qiong , Ma Xiangyu , Yue Ming , Cong Liying , Ma Zhenhui , Zhang Dongtao et al. Tip Interface Exchange-Coupling Based on "Bi-Anisotropic" Nanocomposites with Low Rare-Earth Content. . | ACS applied materials & interfaces , 2021 , 13 (11) , 13548-13555 . |
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摘要 ：
Anisotropic nanocrystalline Sm0.6Pr0.4Co5 magnets were successfully prepared by spark plasma sintering hot pressing and hot deformation technique. The magnetic properties of the hot deformed Sm0.6Pr0.4Co5 magnet were optimized by adjusting the hot deformation temperature. The microstructure, c-axis texture, temperature stability and magnetic hardening mechanism of the optimized magnets were systematically studied. As a consequence, an unprecedentedly high energy product of 21.10 MGOe has been achieved in the single phase hot-deformed magnet, which is the highest value as ever reported, indicating the great application potential for extreme environments of hot deformed Sm0.6Pr0.4Co5 magnet. © 2021
关键词 ：
Anisotropy Anisotropy Cobalt alloys Cobalt alloys Deformation Deformation Hot pressing Hot pressing Magnets Magnets Nanocrystals Nanocrystals Praseodymium alloys Praseodymium alloys Samarium alloys Samarium alloys Sintering Sintering Ternary alloys Ternary alloys Textures Textures
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| GB/T 7714 | Xu, Xiaochang , Li, Yuqing , Teng, Yuan et al. Bulk anisotropic nanocrystalline Sm0.6Pr0.4Co5 magnets with excellent energy density [J]. | Materials Characterization , 2021 , 173 . |
| MLA | Xu, Xiaochang et al. "Bulk anisotropic nanocrystalline Sm0.6Pr0.4Co5 magnets with excellent energy density" . | Materials Characterization 173 (2021) . |
| APA | Xu, Xiaochang , Li, Yuqing , Teng, Yuan , Wang, Ting , Zhang, Hongguo , Zhang, Dongtao et al. Bulk anisotropic nanocrystalline Sm0.6Pr0.4Co5 magnets with excellent energy density . | Materials Characterization , 2021 , 173 . |
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摘要 ：
The evolution of the microstructure, microchemistry and magnetic properties of the Sm(CobalFe0.28CuyZrx)7.6 magnets with different Zr and Cu contents was investigated. It is found that the coercivity of the Sm(Co,Fe,Cu,Zr)z magnets is sensitive to Zr content. The deficiency of Zr content causes heterogeneity of Cu and Fe distributions, while an excessive Zr content leads to the formation of a SmCoZr impurity phase. The cellular structure and distribution of Cu concentration gradient between the cell boundary phase and cell phase are destroyed by inappropriate Zr content, which results in a reduction of coercivity. The Cu concentration difference between the cell boundary phase and cell phase increases with increasing Cu content. The coercivity of the Sm(CobalFe0.28CuyZr0.02)7.6 magnets increases from 10.4 to 25.4 kOe for y = 0.05 and y = 0.07. However, the excess of Cu element destroys the cell boundary phase and enlarges the cell size, resulting in a significant decrease of squareness and energy density. The optimum performance (remanence of 11.4 kG, coercivity of 25.4 kOe, maximum magnetic energy product of 30.4 MGOe) was obtained for the Sm(Co0.63Fe0.28Cu0.07Zr0.02)7.6 magnet. © 2020 Chinese Society of Rare Earths
关键词 ：
Cells Cells Cobalt alloys Cobalt alloys Coercive force Coercive force Copper Copper Cytology Cytology Iron Iron Magnetism Magnetism Magnets Magnets Microstructure Microstructure Samarium alloys Samarium alloys Ternary alloys Ternary alloys Zirconium Zirconium
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| GB/T 7714 | Shang, Zhifeng , Zhang, Dongtao , Xie, Zhihong et al. Effects of copper and zirconium contents on microstructure and magnetic properties of Sm(Co,Fe,Cu,Zr)z magnets with high iron content [J]. | Journal of Rare Earths , 2021 , 39 (2) : 160-166 . |
| MLA | Shang, Zhifeng et al. "Effects of copper and zirconium contents on microstructure and magnetic properties of Sm(Co,Fe,Cu,Zr)z magnets with high iron content" . | Journal of Rare Earths 39 . 2 (2021) : 160-166 . |
| APA | Shang, Zhifeng , Zhang, Dongtao , Xie, Zhihong , Wang, Yunqiao , Haseeb, Muhammad , Qiao, Pengbiao et al. Effects of copper and zirconium contents on microstructure and magnetic properties of Sm(Co,Fe,Cu,Zr)z magnets with high iron content . | Journal of Rare Earths , 2021 , 39 (2) , 160-166 . |
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