By a News Reporter-Staff News Editor at Journal of Technology -- Current study results on Magnetics have been published. According to news originating from Hebei, People's Republic of China, by VerticalNews correspondents, research stated, "Nd-Fe-B composite magnets with different amounts of CaF2 have been prepared by sintering at different temperatures. The microstructure and densities of the Nd-Fe-B composite magnets were investigated by scanning electron microscope and Archimedes method."
Our news journalists obtained a quote from the research from Hebei University, "The electrical and magnetic properties were measured with a four probe electrical resistivity meter and a NIM-2000HF hysteresisgraph meter. The results show that CaF2 was distributed in the grain boundary. The electrical resistances of the composite magnets increased with the increase of the amounts of CaF2, while the magnetic properties of the magnets deteriorated markedly. The electrical resistances of the Nd-Fe-B composite magnets with 3, 6 and 9 wt.% as-bought CaF2 sintered at 1050 degrees C were 270, 320 and mu Omega cm, which increased approximately 17%, 39% and 74% over that of the magnet without CaF2 (230 mu Omega cm). The maximum energy products, (BH)(max), of the composite magnets with 3, 6 and 9 wt.% as-bought CaF2 sintered at 1050 degrees C were 41.03, 35.77 and 28.66 MGOe, respectively. The densities of the composite magnets decreased with the increase of the amounts of CaF2. High energy ball milling can refine CaF2 to nanoscale and thus improve its distribution in the composite magnets. The (BH)(max) of the Nd-Fe-B magnets with 3 wt% CaF2 first increased and then decreased with the increase of milling time."
According to the news editors, the research concluded: "But the electrical resistivities of the sintered Nd-Fe-B magnets with the CaF2 without milling and after high energy ball milling have little change."
For more information on this research see: Effect of CaF2 Addition on the Microstructure and Magnetic and Electrical Properties of Sintered Nd-Fe-B Magnets. IEEE Transactions on Magnetics, 2014;50(1):67-70. IEEE Transactions on Magnetics can be contacted at: Ieee-Inst Electrical Electronics Engineers Inc, 445 Hoes Lane, Piscataway, NJ 08855-4141, USA. (Institute of Electrical and Electronics Engineers - www.ieee.org/; IEEE Transactions on Magnetics - ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=20)
The news correspondents report that additional information may be obtained from W. Li, Hebei Univ Engn, Coll Equipment Manufacture, Handan 056038, Hebei, People's Republic of China. Additional authors for this research include L.Y. Zheng, W.C. Bi, Y.F. Li, M.G. Zhu, H.B. Feng, D. Zhou and Z.H. Guo.
Keywords for this news article include: Asia, Hebei, Magnetics, People's Republic of China
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