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学者姓名：张东涛
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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 ：
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 effect of doping Cu on the mechanical properties and magnetic properties of Sm(Co0.71Fe0.15Cu0.07Zr0.03)7.6 magnets was studied systematically. The results show that the Cu-lean grain boundaries and bending strength of the magnet can be improved by increasing of doping Cu content. The optimal magnetic properties of magnet with 1.0 wt% Cu doping are $B_{\mathrm {r}} =9.9$ kG, $H_{\mathrm {cj}} =23.0$ kOe, and (BH) $_{\mathrm {max}} = 22.2$ MGOe. With the doping content of Cu powders, the bending strength first reaches a peak value of 143.0 MPa at 1.0 wt% and then drops. The bending strength of the magnet with 1.0 wt% Cu doping is about 51.8% higher than that of the magnet with 0 wt% Cu doping. The coercivity and bending strength of the magnet are improved. © 1965-2012 IEEE.
关键词 ：
Bending strength Bending strength Copper Copper Grain boundaries Grain boundaries Magnetic properties Magnetic properties Magnetism Magnetism Magnets Magnets Powders Powders
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| GB/T 7714 | Qiao, P.B. , Zhang, D.T. , Wu, S. et al. The Effect of Doping Cu Powders on Mechanical Properties and Magnetic Properties of Sm(CoFeCuZr)zSintered Magnets [J]. | IEEE Transactions on Magnetics , 2021 , 57 (2) . |
| MLA | Qiao, P.B. et al. "The Effect of Doping Cu Powders on Mechanical Properties and Magnetic Properties of Sm(CoFeCuZr)zSintered Magnets" . | IEEE Transactions on Magnetics 57 . 2 (2021) . |
| APA | Qiao, P.B. , Zhang, D.T. , Wu, S. , Shang, Z.F. , Xie, Z.H. , Liu, W.Q. et al. The Effect of Doping Cu Powders on Mechanical Properties and Magnetic Properties of Sm(CoFeCuZr)zSintered Magnets . | IEEE Transactions on Magnetics , 2021 , 57 (2) . |
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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 correlation between crystallographic orientation textures (including orientation textures of grain and grain boundary plane) and magnetic properties of (Sm,Pr)(2)Co-7 phase (short as 2:7 phase later) in high-performance commercial (Sm,Pr)Co-5 sintered magnet has been investigated. The Rietveld analysis shows that there is about 6.9 wt% of 2:7 phase in the magnet. EBSD results indicate that the grains are strongly textured and the {0001} orientation texture are remarkably preferred. Moreover, the grain boundary planes are also textured. However, the 100011 orientation texture of 2:7 phase is slightly worse than that of (Sm,Pr)Co-5 phase (short as 1:5 phase later). Moreover, the distribution of grain boundary plane has been calculated by the grain orientation texture in the magnet. The most preferential plane distribution locates at 100011 position, and the normal line of the phase boundary plane between the 2:7 phase and 1:5 phase is perpendicular to the easy axis of the magnetization of the magnet. There is difference in crystallographic orientation textures of 2:7 phase and 1:5 phase, which specifies that the orientation degree of phases is different. Furthermore, the orientation degree in turn affects the remanence, suggesting the presence of 2:7 phase will slightly reduce it. Meanwhile, magnetooptical Kerr optical microscope observation shows that the domain widths of 2:7 phase and 1:5 phase are almost the same, and there is no obvious difference in the reversal sequence of magnetic domain. The results proved that 2:7 phase has no significant negative effect on the coercivity. Therefore, the magnet has a crystallographic-orientation-dependent magnetic property. Besides, the study suggests that the anisotropy of crystal plane energy may become a new method to characterize the performance of permanent magnets in the future.
关键词 ：
2:7 phase 2:7 phase Crystallographic orientation texture Crystallographic orientation texture EBSD EBSD Magnetic domain Magnetic domain Magnetic property Magnetic property SmCo5 sintered magnet SmCo5 sintered magnet
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| GB/T 7714 | Yang, Jianjun , Zhang, Dongtao , Zhu, Rongchun et al. Effect of (Sm,Pr)(2)Co-7 phase on magnetic properties of high-performance (Sm,Pr)Co-5 magnet based on EBSD analysis and magnetic domain observation [J]. | MATERIALS CHARACTERIZATION , 2021 , 181 . |
| MLA | Yang, Jianjun et al. "Effect of (Sm,Pr)(2)Co-7 phase on magnetic properties of high-performance (Sm,Pr)Co-5 magnet based on EBSD analysis and magnetic domain observation" . | MATERIALS CHARACTERIZATION 181 (2021) . |
| APA | Yang, Jianjun , Zhang, Dongtao , Zhu, Rongchun , Xu, Xiaochang , Wu, Dan , Li, Yuqing et al. Effect of (Sm,Pr)(2)Co-7 phase on magnetic properties of high-performance (Sm,Pr)Co-5 magnet based on EBSD analysis and magnetic domain observation . | MATERIALS CHARACTERIZATION , 2021 , 181 . |
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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 ：
In this article, the Sm2Co7/α-Fe nanocomposite magnets were prepared by high energy ball milling and spark plasma sintering method. The effect of soft phase content on the magnetic properties was studied. Up to 30 wt% α-Fe was added into Sm2Co7 matrix without the decrease of remanence. Optimal energy product (BH)max of 9.2MGOe was obtained with 20 wt% α-Fe. TEM observation shows that the grain size of α-Fe is 20–50 nm which ensures a good coupling effect between soft and hard phase. One more thing needs to be mentioned is that there exists inter-diffusion between Sm–Co phase and α-Fe phase. Moreover, our results can also illustrate that the Sm2Co7/α-Fe nanocomposite magnets are able to acquire better magnetic properties than the SmCo5/α-Fe magnets prepared by the same process due to the large domain width of Sm2Co7 phase. © 2020 Chinese Society of Rare Earths
关键词 ：
Ball milling Ball milling Binary alloys Binary alloys Cobalt alloys Cobalt alloys Cobalt metallography Cobalt metallography Iron alloys Iron alloys Iron metallography Iron metallography Magnetic properties Magnetic properties Magnetism Magnetism Magnetoplasma Magnetoplasma Magnets Magnets Milling (machining) Milling (machining) Morphology Morphology Nanocomposites Nanocomposites Samarium alloys Samarium alloys Spark plasma sintering Spark plasma sintering
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| GB/T 7714 | Zhuge, Yitong , Li, Yuqing , Xu, Xiaochang et al. Morphology and magnetic properties of Sm2Co7/α-Fe nanocomposite magnets produced by high energy ball milling and spark plasma sintering [J]. | Journal of Rare Earths , 2021 , 39 (3) : 312-316 . |
| MLA | Zhuge, Yitong et al. "Morphology and magnetic properties of Sm2Co7/α-Fe nanocomposite magnets produced by high energy ball milling and spark plasma sintering" . | Journal of Rare Earths 39 . 3 (2021) : 312-316 . |
| APA | Zhuge, Yitong , Li, Yuqing , Xu, Xiaochang , Zhang, Dongtao , Zhang, Hongguo , Liu, Weiqiang et al. Morphology and magnetic properties of Sm2Co7/α-Fe nanocomposite magnets produced by high energy ball milling and spark plasma sintering . | Journal of Rare Earths , 2021 , 39 (3) , 312-316 . |
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摘要 ：
Keeping a high proportion of soft magnetic phase with small grain size and uniform distribution of soft and hard magnetic phase is the key factor to fabricate bulk nanocomposites. We report a novel design to fabricate high performance SmCo5/α-Fe nanocomposites by choosing nanoscale α-Fe flakes as raw material of soft magnetic phase instead of micron scale α-Fe particles. Microstructure optimization, i.e., fine and dispersive distribution of α-Fe grains in SmCo5 matrix, and high soft magnetic phase proportion up to 25 wt% were achieved simultaneously. As a consequence, the remanence, intrinsic coercivity, and maximum energy product rise by 13.55%, 46.99%, and 80.03% in the SmCo5/α-Fe nanocomposites with 20 wt% α-Fe, respectively. Moreover, a giant remanence of 9.75 kG is achieved in the SmCo5/α-Fe nanocomposite with 25 wt% α-Fe nanoflakes content. © 2020 Elsevier Inc.
关键词 ：
Binary alloys Binary alloys Cobalt alloys Cobalt alloys Iron alloys Iron alloys Microstructure Microstructure Morphology Morphology Nanocomposites Nanocomposites Nanomagnetics Nanomagnetics Remanence Remanence Samarium alloys Samarium alloys
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| GB/T 7714 | Xu, Xiaochang , Li, Yuqing , Ma, Zhenhui et al. Tuning the morphology of soft magnetic phase to optimize the microstructure of SmCo5/α-Fe nanocomposites [J]. | Materials Characterization , 2021 , 172 . |
| MLA | Xu, Xiaochang et al. "Tuning the morphology of soft magnetic phase to optimize the microstructure of SmCo5/α-Fe nanocomposites" . | Materials Characterization 172 (2021) . |
| APA | Xu, Xiaochang , Li, Yuqing , Ma, Zhenhui , Zhuge, Yitong , Teng, Yuan , Zhang, Yu et al. Tuning the morphology of soft magnetic phase to optimize the microstructure of SmCo5/α-Fe nanocomposites . | Materials Characterization , 2021 , 172 . |
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