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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 ：
一种可降低残余碳危害的稀土永磁材料Pr2Fe14C的相稳定性提升方法，涉及永磁材料技术领域。由具有如下所示化学计量比的物质组成：(Pr, RE)2Fe14C；其中RE＝Sm、Gd；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20≤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500～1100℃的退火炉中进行。在本发明利用Sm2Fe14C和Gd2Fe14C相的高稳定性，用Sm、Gd原子置换Pr2Fe14C中的部分Pr原子，扩展了Pr2Fe14C相的稳定区间，制得了纯相的(Pr, RE)2Fe14C型稀土永磁材料。
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| GB/T 7714 | 张红国 , 白祯至 , 岳明 et al. 一种可降低残余碳危害的稀土永磁材料Pr2Fe14C的相稳定性提升方法 : CN202310244834.6[P]. | 2023-03-14 . |
| MLA | 张红国 et al. "一种可降低残余碳危害的稀土永磁材料Pr2Fe14C的相稳定性提升方法" : CN202310244834.6. | 2023-03-14 . |
| APA | 张红国 , 白祯至 , 岳明 , 张东涛 , 刘卫强 , 路清梅 . 一种可降低残余碳危害的稀土永磁材料Pr2Fe14C的相稳定性提升方法 : CN202310244834.6. | 2023-03-14 . |
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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 ：
一种基于一级和二级相变材料的复合磁制冷材料及制备方法，属于磁性功能材料中的磁制冷材料领域。选取一种具有基于一级相变磁热效应的磁制冷材料(A)和另一种具有基于二级相变磁热效应的磁制冷材料(B)，其中一级相变磁制冷材料(A)具有较强脆性，而二级相变磁制冷材料(B)具有较高的力学性能。根据本发明制备的一级相变材料磁制冷材料(A)与二级相变磁制冷材料材料(B)的复合磁体能改善非相变材料对磁热性能的稀释，具有较高的力学性能与热传导性能。
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| GB/T 7714 | 张红国 , 吴正 , 岳明 et al. 一种基于一级和二级相变材料的复合磁制冷材料及制备方法 : CN202210266608.3[P]. | 2022-03-16 . |
| MLA | 张红国 et al. "一种基于一级和二级相变材料的复合磁制冷材料及制备方法" : CN202210266608.3. | 2022-03-16 . |
| APA | 张红国 , 吴正 , 岳明 , 张东涛 , 刘卫强 , 路清梅 . 一种基于一级和二级相变材料的复合磁制冷材料及制备方法 : CN202210266608.3. | 2022-03-16 . |
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摘要 ：
一种定向组装的各向异性纳米晶复合稀土永磁体及其制备方法，属于稀土永磁材料制备技术领域。该方法所制备的磁体由具有高饱和磁化强度和高磁各向异性的两种基元根据逐层定向组装而成。所述制备方法包括：制备纳米晶/非晶稀土永磁粉作为组装基元；定向组装并压制成热变形前驱体；对所述前驱体进行热变形，获得定向组装的各向异性纳米晶复合稀土永磁体。本发明制备的定向组装纳米晶复合稀土永磁体可以协同远程的静磁相互作用和近程的交换耦合作用实现磁性能显著提高。
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| GB/T 7714 | 李玉卿 , 刘卫强 , 滕媛 et al. 一种定向组装的各向异性纳米晶复合稀土永磁体及其制备方法 : CN202210291872.2[P]. | 2022-03-22 . |
| MLA | 李玉卿 et al. "一种定向组装的各向异性纳米晶复合稀土永磁体及其制备方法" : CN202210291872.2. | 2022-03-22 . |
| APA | 李玉卿 , 刘卫强 , 滕媛 , 岳明 , 徐晓厂 , 张东涛 et al. 一种定向组装的各向异性纳米晶复合稀土永磁体及其制备方法 : CN202210291872.2. | 2022-03-22 . |
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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 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 ：
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 ：
Crystallographic orientation texture Crystallographic orientation texture Magnetic domain Magnetic domain 2:7 phase 2:7 phase Magnetic property Magnetic property EBSD EBSD 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 ：
一种一步加热制备各向异性钕铁硼磁体的方法，属于稀土磁性材料制备技术领域。包括：将磁粉冷压成型；然后，对冷压成型的压坯体直接进行热挤压以获得各向异性纳米晶磁体。热挤压过程中，首先升温到变形温度，保温一定时间，然后加压进行变形，将压坯体挤入预先设计的模具压头间隙内成型。与传统热压‑热变形方法相比，本发明具有以下优势：首先，本发明只需要一步加热，即可获得各向异性磁体，大大减低能源消耗，降低成本；其次，本发明可以节省加热、冷却以及脱模等工序，从而大大缩短工序流程，提高生产效率，适合连续生产；最后，本发明可以通过模具设计直接生产具有各类形状截面的柱状磁体，具有净成型特征。
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| GB/T 7714 | 岳明 , 唐渝洋 , 李玉卿 et al. 一种一步加热制备各向异性钕铁硼磁体的方法 : CN202110456496.3[P]. | 2021-04-26 . |
| MLA | 岳明 et al. "一种一步加热制备各向异性钕铁硼磁体的方法" : CN202110456496.3. | 2021-04-26 . |
| APA | 岳明 , 唐渝洋 , 李玉卿 , 刘卫强 , 路清梅 , 张东涛 et al. 一种一步加热制备各向异性钕铁硼磁体的方法 : CN202110456496.3. | 2021-04-26 . |
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