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Tao L.,Hefei University of Technology | Li H.,Hefei University of Technology | Shen J.,Earth Panda Advance Magnetic Material Co. | Qiao K.,Hefei University of Technology | And 4 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2014

The AlN/SiC bilayer and SiC monolayer thin films were deposited on sintered NdFeB by RF magnetron sputtering to improve the corrosion resistance. Their structures and morphologies were studied by XRD and AFM and SEM. The corrosion behaviors of AlN/SiC and SiC-coated NdFeB in 3.5 wt% NaCl, 20 wt% NaOH and 0.1 mol/L H2SO4 solutions were characterized with potentiodynamic polarization curves. The results show that AlN/SiC and SiC thin films can evidently improve the corrosion resistance of NdFeB, and the AlN/SiC films have the better resistance than the SiC film. © 2014 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


Wang M.,Hefei University of Technology | Zhang P.,Hefei University of Technology | Liu Q.,Hefei University of Technology | Liu J.,Hefei University of Technology | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2016

Environmental-friendly and chromium-free Zn-Al coating on sintered NdFeB magnet was prepared by spraying method with silane as adhesive and flake-like Zn and Al powder as raw materials. The phase structure and morphology of the Zn-Al coating were characterized by X-ray diffraction (XRD) and scan electron microscopy (SEM), respectively. The corrosion resistance was analyzed by means of neutral salt spray (NNS) and electrochemical test. The coating adhesion was measured by tensile test. The results indicate that the NdFeB magnet is coated with a uniform and dense Zn-Al layer. The coating thickness is about 27 μm and coating adhesion can reach up to 10.95 MPa. Zn-Al coating has the function of anodic protection for NdFeB matrix. The flake-like structure could extend corrosion channel in the corrosion media. The NNS duration is up to 600 h and far better than that of the traditional electroplated zinc layer. © 2016, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved. Source


Sun C.,Beijing University of Technology | Liu W.Q.,Beijing University of Technology | Sun H.,Beijing University of Technology | Yue M.,Beijing University of Technology | And 2 more authors.
Journal of Materials Science and Technology | Year: 2012

Nd-Fe-B permanent magnets with a small amount of Cu nano-particles doping have been prepared by conventional sintered method. Effects of Cu content on magnetic properties, corrosion resistance, and oxidation properties of the magnets have been studied. It shows that the coercivity rises gradually, while the remanence decreases simultaneously with increasing Cu doping amount. Microstructure observation reveals that Cu element enriches mainly the Nd-rich phase. Autoclave test results show that the corrosion rate of the magnets decreases with increasing Cu content. After oxidation, the maximum energy product loss of the magnets with 0 and 0.2 wt% Cu nano-particles doping are 6.13% and 0.99%, respectively. Therefore, it is concluded that Cu nano-particles doping is a promising way to enhance the coercivity and corrosion resistance of sintered Nd-Fe-B magnets. © 2012 The Chinese Society for Metals. Source


Liu W.,Beijing University of Technology | Sun C.,Beijing University of Technology | Yue M.,Beijing University of Technology | Sun H.,Beijing University of Technology | And 4 more authors.
Journal of Rare Earths | Year: 2013

Nd-Fe-B permanent magnets with a small amount of Al nano-particles doping were prepared by conventional sintered method. Effect of Al content on magnetic property, corrosion resistance and oxidation properties of the magnets were studied. Investigation showed that the coercivity rose gradually, while the remanence decreased simultaneously with increase of Al doping amount. Further investigation revealed that most Al element diffused into the main phase and some Al element diffused into the Nd-rich phase. The autoclave test results showed that the corrosion rate of the magnets decreased with Al content increasing. After oxidation, the maximum energy product losses of the magnets with 0.0 wt.% and 0.2 wt.% Al nano-particles doping were 6.13% and 3.99%, respectively. Therefore, Al nano-particles doping was a promising way to enhance the coercivity and corrosion resistance of sintered Nd-Fe-B magnet. © 2013 The Chinese Society of Rare Earths. Source

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