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Liu W.Q.,Beijing University of Technology | Sun H.,Beijing University of Technology | Yi X.F.,Anhui Earth panda Advance Magnetic Material Co. | Liu X.C.,Beijing University of Technology | And 3 more authors.
Journal of Alloys and Compounds | Year: 2010

NdFeB permanent magnets with a small amount of Dysprosium (Dy) nanoparticles doping were prepared by conventional sintered method, and the microstructure and magnetic properties of the magnets were studied. Investigation shows that the coercivity rises gradually, while the remanence decreases simultaneously with increased Dy doping amount. As a result, the magnet with 1.5 wt.% Dy exhibits optimal magnetic properties. Further investigation presumed that Dy is enriched as (Nd, Dy)2Fe 14B phase in the surface region of the Nd2Fe 3,4B matrix grains indicated by the enhancement of the magnetocrystalline anisotropy field of the Nd2Fe3,4B phase. As a result, the magnet doped with a small amount ofDy nanoparticles possesses remarkably enhanced coercivity without sacrificing its magnetization noticeably. © 2010 Elsevier B.V. All rights reserved. Source


Yi X.-F.,Anhui Earth panda Advance Magnetic Material Co. | Liu W.-Q.,Beijing University of Technology | Yue M.,Beijing University of Technology | Zhang D.-T.,Beijing University of Technology
Gongneng Cailiao yu Qijian Xuebao/Journal of Functional Materials and Devices | Year: 2010

Sintered NdFeB magnets with different rare earth content were prepared by Spark Plasma Sintering technique. Magnets with same composition were produced using conventional sintering method for comparison. The corrosion behavior of the magnets in the autoclave were investigated. Compared with conventional sintered NdFeB magnets, the SPS magnets process better corrosion resistance. The sintered NdFeB magnets exhibit excellent corrosion resistance with the reduction of rare earth content. Source


Li Z.,Beijing University of Technology | Liu W.,Beijing University of Technology | Zha S.,Beijing University of Technology | Li Y.,Beijing University of Technology | And 6 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2015

(Nd1-xCex)30Fe69B (x=0, 0.1, 0.2, 0.3, 0.4, 0.5, and 0.6) alloys were prepared by inducting melting, and the effect of substitution of Ce for Nd on their microstructure and intrinsic magnetic properties were investigated. With the increase of Ce content, Curie temperature (Tc) decreases from 582.4 to 504.8 K, saturation magnetization (Ms) decreases from 15.88 to 12.71 kGs, and anisotropy field (HA) decreases from 67.4 to 52.7 kOe. However, the reductions of the intrinsic magnetic properties are relatively gentle, and they still have potential to be prepared as permanent magnets. Moreover, further microstructure observations show that Ce is tending to diffuse into the Nd-rich grain boundary phase instead of main phase during the substitute process. Such aggregation behavior is beneficial to fabricate Ce containing magnet with high Ms. © 2015 Elsevier B.V. All rights reserved. Source


Wang L.,Beijing University of Technology | Chen J.,Anhui Earth panda Advance Magnetic Material Co. | Yue M.,Beijing University of Technology | Liu R.,Beijing University of Technology | And 5 more authors.
Journal of Rare Earths | Year: 2011

Crystallographic alignment and magnetic anisotropy were studied for Nd xFe94-xB6 (x=8, 9, 10, 11) ribbons prepared via melt-spinning. Effect of Nd content and wheel speed on the crystal structure and magnetic properties of the ribbons was investigated. Both the free and wheel side of the ribbons could obtain strong c-axis crystal texture of Nd 2Fe14B phase perpendicular to the ribbons surface at low wheel speed, but the texture weakened gradually with the increase of the wheel speed. Increase of Nd content led to better formation of crystal texture in the ribbons, indicating that the α-Fe phase might undermine the formation of crystal texture. Magnetic measurement results showed that the magnetic anisotropy of the ribbons exhibited corresponding behavior with the invariance of the c-axis crystal texture of Nd2Fe14B phase in the ribbons, and the coercivity of the ribbons rose with the increase of both Nd content and wheel speed during melt-spun process. © 2011 The Chinese Society of Rare Earths. Source


Liu R.,Beijing University of Technology | Chen J.,Anhui Earth panda Advance Magnetic Material Co. | Deng Y.,Beijing University of Technology | Na R.,Beijing University of Technology | And 3 more authors.
Journal of Rare Earths | Year: 2010

Ternary Tb-Fe-B ribbons were prepared via melt-spun technique under different wheel speeds of 5-25 m/s. Effect of wheel speed on the crystal structure and microstructure of the ribbons was investigated. All the ribbons quenched under different wheel speeds crystallized in single Tb 2Fe14B phase with tetragon structure. Different crystallographic alignment evolutions were observed in the free side surface and wheel side surface of the ribbons. On the free-side surface, an in-plane c-axis crystal texture of Tb2Fe14B phase was found in the ribbons quenched at 5 m/s. However, with the increase in the wheel speed, the direction of the c-axis texture turns to perpendicular to the ribbon surface. On the wheel-side surface, a strong c-axis texture perpendicular to the ribbon surface was observed in the ribbons quenched at 5 m/s, and then weakened gradually with the increase in the wheel speed. Further investigation showed that the competition of the two types of temperature gradients during the quench process was responsible for the crystallographic alignment evolution in the ribbons. © 2010 The Chinese Society of Rare Earths. Source

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