TY - JOUR
T1 - Anisotropic bonded NdFeB magnets with radial oriented magnetization by 2-step warm compaction process
AU - Tao, Siwu
AU - Tian, Jianjun
AU - Lu, Xin
AU - Qu, Xuanhui
AU - Honkura, Y.
AU - Mitarai, H.
AU - Noguchi, K.
PY - 2009/5/27
Y1 - 2009/5/27
N2 - Anisotropic bonded NdFeB magnets obviously have better magnetic properties than those of conventional isotropic bonded NdFeB magnets. The anisotropic bonded magnets can be used to make some magnetic devices with special oriented magnetization, such as radial oriented rings. In order to increase the magnetic properties and prolong the life of the molding die, the anisotropic bonded NdFeB magnets with radial oriented magnetization were prepared by 2-step warm compaction molding, which were called the aligning step and densifying step, respectively. In the aligning step, the magnetic powder particles aligned along the radial direction of the magnetic field (1.0 T) and are compressed under 143 MPa at 393 K. (BH)max and density of the magnets were 146 kJ/m3 and 5.7 g/cm3, respectively. Then the ring compacts were re-compressed under 800 MPa at 420 K in the densifying step. The density increased to 6.2 g/cm3 and magnetic properties were: Br = 0.92 T, Hcj = 1020 kA/m, (BH)max = 168 kJ/m3. SEM micrograph showed that the magnets had excellent microstructure and the magnetic particles were evenly coated by binder. Crown
AB - Anisotropic bonded NdFeB magnets obviously have better magnetic properties than those of conventional isotropic bonded NdFeB magnets. The anisotropic bonded magnets can be used to make some magnetic devices with special oriented magnetization, such as radial oriented rings. In order to increase the magnetic properties and prolong the life of the molding die, the anisotropic bonded NdFeB magnets with radial oriented magnetization were prepared by 2-step warm compaction molding, which were called the aligning step and densifying step, respectively. In the aligning step, the magnetic powder particles aligned along the radial direction of the magnetic field (1.0 T) and are compressed under 143 MPa at 393 K. (BH)max and density of the magnets were 146 kJ/m3 and 5.7 g/cm3, respectively. Then the ring compacts were re-compressed under 800 MPa at 420 K in the densifying step. The density increased to 6.2 g/cm3 and magnetic properties were: Br = 0.92 T, Hcj = 1020 kA/m, (BH)max = 168 kJ/m3. SEM micrograph showed that the magnets had excellent microstructure and the magnetic particles were evenly coated by binder. Crown
KW - Anisotropic bonded NdFeB magnets
KW - Density
KW - Magnetic properties
KW - Radial oriented magnetization
KW - Warm compaction
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U2 - 10.1016/j.jallcom.2008.10.119
DO - 10.1016/j.jallcom.2008.10.119
M3 - Article
AN - SCOPUS:67349263523
SN - 0925-8388
VL - 477
SP - 510
EP - 514
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 1-2
ER -