State Key Laboratory for Artificial Microstructure and Mesoscopic Physics and School of Physics, Peking University
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DOI:
10.7502/j.issn.1674-3962.2015.11.04
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Abstract:
This paper reported the results of the studying on anisotropic magnetic materials of R-Fe-N (R = Nd, Sm) and R2Fe14B (Nd, Pr). By means of neutron diffraction, magnetic measurements, electron microscope and electronic structure calculation, a systematic investigation has been made to understand the interstitial atom effects on the magnetic properties of the R-Fe compounds. By the understanding of the relationship among the intrinsic magnetic properties, the domain structure and fabrication process, high performance magnetic powders based on the 1:12 and 2:17 nitrides have been successfully produced in large scale. We have also investigated the formation mechanism for the high textured HDDR Nd-Fe-B magnetic powders, and successful fabricates HDDR (Pr,Nd)2Fe14B powders with high coercivity and high energy product . We have tried to develop key industrialization technologies for high-performance anisotropic R-Fe-N and R2Fe14B magnetic powders and magnets, and a 100-ton production line for R-Fe-N magnetic powders was built up. The high-performance anisotropic bonded magnet based on R-Fe-N and R2Fe14B were explored.