快淬粉爆炸压制Nd-Fe-B永磁体的性能与结构特征
CHARACTERIZATION OF MELT-SPUN Nd-Fe-B MAGNETS PREPARED BY EXPLOSIVE COMPACTION
摘 要
利用爆炸压制方法制备的快淬永磁体，其磁性能、压缩强度和密度都比相同粉料制备的粘结磁体有明显提高，其中最大磁能积(BH)max提高了30%，压缩强度σbc增加了40%。扫描电镜观察显示，爆炸压制磁体的粉体颗粒表面出现了局部的熔融区域与大量的微裂纹。借助于场发射扫描电镜进一步观察发现，爆炸样品粉体颗粒表面出现纳米数量级的蜂窝状组织。磁力显微镜观察表明，爆炸压制不仅保持了原始粉末细小的晶粒尺寸，还保持了原始快淬粉细小的磁畴结构，磁体粉体颗粒中存在大量的微裂纹，但是微裂纹对快淬粉爆炸压制磁体的磁性能几乎没有影响。
爆炸压制
微观结构
磁畴
Nd-Fe-B permanent magnet
Explosive compaction
Microstructure
Magnetic domain
Abstract
Explosive compaction processing is applied to prepare Nd-Fe-B magnets with melt-spun powders. It is found that shock consolidation processing could result in the magnetic properties, compressed strength and density of Nd-Fe-B bulk better than that of the conventional resin-bonded magnet. Scanning electron microscope (SEM) observation shows the melted areas and a mass of the micro-cracks in the close-packed particles resulted from the shock wave. The small Nd2Fe14B grains less than 100 nm are revealed using the field emission scanning electron microscope (FE-SEM). The corresponding magnetic structure consisting of the very fine magnetic domains is also revealed with magnetic force microscopy (MFM). The results indicate that not only the microstructure but also the magnetic domain structure of the original powder are kept after explosive compaction. Although there are many micro-cracks in particles, the excellent magnetic properties are still obtained because the magnetic domain structure is so fine that seems not to be affected by the micro-cracks.
中图分类号 TG115
所属栏目
基金项目 国家自然科学基金资助项目(50071035);上海市自然科学基金资助项目(02ZE14054)
收稿日期 2005/6/30
修改稿日期
网络出版日期
作者单位点击查看
备注张瓦利(1979-)，男，硕士研究生。
引用该论文: ZHANG Wa-li,LIU Wei,AO Qi,WANG Xin-jian,WU Jian-sheng. CHARACTERIZATION OF MELT-SPUN Nd-Fe-B MAGNETS PREPARED BY EXPLOSIVE COMPACTION[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2006, 42(1): 1～4
张瓦利,刘薇,敖琪,王新建,吴建生. 快淬粉爆炸压制Nd-Fe-B永磁体的性能与结构特征[J]. 理化检验－物理分册, 2006, 42(1): 1～4
共有人对该论文发表了看法，其中：
人认为该论文很差
人认为该论文较差
人认为该论文一般
人认为该论文较好
人认为该论文很好
参考文献
【1】Croat J J, Herbst J F, Lee R W, et al. Pr-Fe and Nd-Fe-based Materials: A New Class of High-performance Permanent Magnets (Invited)[J]. J Appl Phys, 1984,55(6): 2078-2082.
【2】Sagawa M, Fujimura S, Togawa N, et al. New Material for Permanent Magnets on a Base of Nd and Fe (Invited)[J]. J Appl Phys, 1984,55(6): 2083-2087.
【3】Narasimhan K S V L. Iron-based Rare-earth Magnets (Invited)[J]. J Appl Phys, 1985,57(1): 4081-4085.
【4】Joseph J Becker. Rapidly Quenched Metals for Permanent Magnet Materials (Invited)[J]. J Appl Phys, 1984,55(6): 2067-2072.
【5】Lee R W. Hot-pressed Neodymium-iron-boron Magnets[J]. J Appl Phys, 1985,46(8): 790-791.
【6】Sagawa M, Fujinura S, Yamamoto H, et al. Permanent Magnet Materials Based on the Rare Earth-iron-boron Tetragonal Compounds[J]. IEEE Trans Magn, 1984,20(5): 1584-1859.
【7】Guruswamy S, McCarter M K, Shield J E. Explosive Compaction of Magnequench Nd-Fe-B Magnetic Powders[J]. J Appl Phys, 1996,79(8): 4851-4853.
【8】Raja K MIshra, Chen J K, Thomas G. Effect of Annealing on the Microstructure of Sintered Nd-Fe-B Magnets[J]. J Appl Phys, 1986,59(6): 2244-2246.
【9】Ando S, Mine Y, Takashima K, et al. Explosive Compaction of Nd-Fe-B Powder[J]. J Mater Proc Tech, 1999,85(1): 142-147.
【10】刘 薇,蒋建华,曹力军.磁力显微镜在Nd-Fe-B硬磁材料上的应用[J].上海交通大学学报, 2003,37(2): 241-244.
【11】AL-Khafaji M A, Rainforth W M, Gibbs M R J, et al. The Effect of Phase Constitution on the Magnetic Structure of Nanophase NdFeB Alloys Observed by Magnetic Force Microscopy[J]. J Magn Magn Mater, 1998,188(1-2): 109-118.
【2】Sagawa M, Fujimura S, Togawa N, et al. New Material for Permanent Magnets on a Base of Nd and Fe (Invited)[J]. J Appl Phys, 1984,55(6): 2083-2087.
【3】Narasimhan K S V L. Iron-based Rare-earth Magnets (Invited)[J]. J Appl Phys, 1985,57(1): 4081-4085.
【4】Joseph J Becker. Rapidly Quenched Metals for Permanent Magnet Materials (Invited)[J]. J Appl Phys, 1984,55(6): 2067-2072.
【5】Lee R W. Hot-pressed Neodymium-iron-boron Magnets[J]. J Appl Phys, 1985,46(8): 790-791.
【6】Sagawa M, Fujinura S, Yamamoto H, et al. Permanent Magnet Materials Based on the Rare Earth-iron-boron Tetragonal Compounds[J]. IEEE Trans Magn, 1984,20(5): 1584-1859.
【7】Guruswamy S, McCarter M K, Shield J E. Explosive Compaction of Magnequench Nd-Fe-B Magnetic Powders[J]. J Appl Phys, 1996,79(8): 4851-4853.
【8】Raja K MIshra, Chen J K, Thomas G. Effect of Annealing on the Microstructure of Sintered Nd-Fe-B Magnets[J]. J Appl Phys, 1986,59(6): 2244-2246.
【9】Ando S, Mine Y, Takashima K, et al. Explosive Compaction of Nd-Fe-B Powder[J]. J Mater Proc Tech, 1999,85(1): 142-147.
【10】刘 薇,蒋建华,曹力军.磁力显微镜在Nd-Fe-B硬磁材料上的应用[J].上海交通大学学报, 2003,37(2): 241-244.
【11】AL-Khafaji M A, Rainforth W M, Gibbs M R J, et al. The Effect of Phase Constitution on the Magnetic Structure of Nanophase NdFeB Alloys Observed by Magnetic Force Microscopy[J]. J Magn Magn Mater, 1998,188(1-2): 109-118.
相关信息
