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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


Liu W.,Beijing Materials University | Li C.,Beijing Materials University | Zakotnik M.,Beijing Materials University | Yue M.,Beijing Materials University | And 3 more authors.
Journal of Rare Earths | Year: 2015

Abstract Recycling of waste sintered Nd-Fe-B permanent magnets by doping DyH3 nanoparticles was investigated. The effect of the DyH3 nanoparticles on the microstructure and magnetic properties of the recycled magnets was studied. As the DyH3 nanoparticles additive increased, the coercivity of recycled magnet increased gradually. The recycled magnets with DyH3 nanoparticle content between 0.0 wt.% and 1.0 wt.% maintained the remanence (Br), but, with higher additions, the Br began to decrease rapidly. The best recycled magnet produced contained 1.0 wt.% of DyH3 nanoparticles when compared to the properties of the starting waste sintering magnet. The Hcj, Br and (BH)max values of 101.7%, 95.4%, and 88.58%, respectively, were recovered. © 2015 The Chinese Society of Rare Earths. Source


Li X.T.,Beijing University of Technology | Yue M.,Beijing University of Technology | Liu W.Q.,Beijing University of Technology | Li X.L.,Anhui Province Key Laboratories of Rare Earth Permanent Magnet Materials | And 8 more authors.
Journal of Alloys and Compounds | Year: 2015

The waste Nd-Fe-B sintered magnets up to 500 kg per batch were recycled to manufacture anisotropic sintered magnets by combination of hydrogen decrepitation (HD) and alloying technique. Magnetic properties and thermal stability of both the waste magnets and recycled magnets were investigated. The recycled magnet exhibits magnetic properties with remanence (Br) of 12.38 kGs, coercivity (Hci) of 24.89 kOe, and maximum energy product [(BH)max] of 36.51 MGOe, respectively, which restores 99.20% of Br, 105.65% of Hci, and 98.65% of (BH)max of the waste magnets, respectively. The volume fraction of Nd-rich phase in the recycled magnets is about 10.1 vol.%, which is bigger than that of the waste magnets due to the additive of Nd3PrFe14B alloy containing more rare earth. The remanence temperature coefficient (α) and coercivity temperature coefficient (β) of the recycled magnets are -0.1155%/K and -0.5099%/K in the range of 288-423 K, respectively, which are comparative to those of the waste magnets. © 2015 Elsevier B.V. All rights reserved. Source

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