Magnetic properties and thermal stability of anisotropic bonded Nd-Fe-B magnets by warm compaction |
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Authors: | Siwu Tao Xin Lu Jianjun Tian Xuanhui Qu Y Honkura H Mitarai K Noguchi |
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Affiliation: | 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;Aichi Steel Corporation, Wano-wari. Arao-machi Tokai-shi, Aichi-ken, 476-8666, Japan 2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China 3. Aichi Steel Corporation, Wano-wari. Arao-machi Tokai-shi, Aichi-ken, 476-8666, Japan |
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Abstract: | Anisotropic bonded magnets were prepared by warm compaction using anisotropic Nd-Fe-B powder. The forming process, magnetic properties, and temperature stability were studied. The results indicate that the optimal temperature of the process, which was decided by the viscosity of the binders, was 110℃. With increasing pressure, the density of the magnets increased. When the pressure was above 700 MPa, the powder particles were destroyed and the magnetic properties decreased. The magnetic properties of the anisotropic bonded magnets were as follows: remanence Br = 0.98 T, intrinsic coercivity iHc=1361 kA/m, and maximum energy product BHmax = 166 kJ/m3. The magnets had excellent thermal stability because of the high coercivity and good squareness of demagnetization curves. The flux density of the magnets was 35% higher than that of isotropic bonded Nd-Fe-B magnets at 120℃ for 1000 h. The flux density of the bonded magnets showed little change with regard to temperature. |
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Keywords: | anisotropic magnets Nd-Fe-B magnets warm compaction process magnetic properties thermal stability |
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