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Succession law of Nd–Fe–B alloys with different coercivitiesJie Tang1,2,Li-Rong Yang1,Lin Zhang2,Cheng-Fu Wei1,Yang Mei2,Yong-Ge Wen11. School of Chemistry and Chemical Engineering, Mianyang Normal University2. Research Center of Laser Fusion, China Academy of Engineering Physics摘 要: 铽纳米颗粒掺杂烧结高性能NdFeB永磁的研究
张久兴1,曹爱利1,刘卫强1,张东涛1,岳明1,菅志刚1
(1.北京工业大学材料科学与工程学院,北京,100124)
摘要:分别采用物理气相沉积和快淬-氢爆工艺制备了Tb纳米粉和主相Nd_2Fe_(14)B磁性粉末, 研究了Tb纳米颗粒掺杂对烧结NdFeB永磁磁性能和微观结构的影响. 结果表明, 随着纳米Tb粉含量的增加, 磁体的矫顽力逐渐升高, 剩磁和磁能积则呈下降趋势. 显微组织研究表明, Tb元素富集在主相晶粒的边界层位置, 这种分布方式不仅有效地提高了磁体的矫顽力, 而且降低了Tb的添加量, 从而减小了Tb的添加对磁体剩磁及磁能积的负面影响.
关键词:铽纳米颗粒; 烧结NdFeB永磁; 矫顽力; 富Nd相; Tb Nano-particles; sintered NdFeB magnet; coercivities; Nd......铽纳米颗粒掺杂烧结高性能NdFeB永磁的研究
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来源: 《稀有金属2009年第6期》——张久兴 曹爱利 刘卫强 张东涛 岳明 菅志刚
at 600°C for 30 min. The effect of MgO layer thickness on the structures and magnetic properties of the FePt/MgO multilayers was investigated. The coercivities and inter-grain interactions of the FePt/MgO... with appropriate coercivities, high perpendicular anisotropy, and weak in-ter-grain interactions were obtained by controlling the MgO layer thickness. Overall, these results indicate that the FePt/MgO nanos......
. The dependence of the saturation magnetization and coercivities of the Fe-doped BaTiO3 ceramics on doping level was systematically studied. Both the saturation magnetization and magnetic coercivities... ceramics was also reported in Ref.[13]. The magnetic coercivities (HC) remained very low and almost unchanged at about 1×10-2 T from x = 2% to 6%, and then suddenly jumped much higher to about 0.1 T......
of the coercivity for the(Nd0.935Dy0.065)14.5Fe79.4B6.1magnet and the temperature dependence of the coercivity for the Nd14.5Fe79.4B6.1 magnet havebeen done. Results show that coercivities for strip......
coercivities were synthesized by thermal decomposition of cobalt acetate for the application of ultra-high density magnetic recording media. Without using any reducing agent, Co nanoparticles of 13.9-21.3 nm......
%, and the coercivities were 127 and 334 A/m, respectively. X-rayphotoelectron spectroscopy (XPS) and X-ray diffraction (XRD) were used to study the structure and surface chemical state. The ex-perimental results......
were investigated by X-ray diffraction (XRD) and vibrating sample magnetometer (VSM), respectively. With increasing phosphor content, the coercivities of Co-12 at.% Pt-P films increase from 1034 to 1525......
. Especially for the sample with x = 0.64, coercivities in hard and easy axes are 5.0×10-5 and 3.6×10-4 T, respectively, and the electric resistivity ρ reaches 1,790 μΩ·cm. The dependence of complex......
investigated. High saturation magnetization(74.8 mA·m2·g–1) and intrinsic coercivities(614.46 mT) were achieved for pH 7.0 of the sol system, for which the molar ratio of citric acid dosage to the total......