Study of high-coercivity sintered NdFeB magnets

Bai, Guohua; Gao, Ruonan; Sun, Yuan; Han, Guangbing; Wang, B.

doi:10.1016/j.jmmm.2006.04.029

Cited by 146 publications

(56 citation statements)

References 8 publications

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“…Dy addition can suppress the separation of a-Fe branch crystals when the melted alloy solidifies, and thus make the grains of the magnets uniform and fine [12]. The surface defects of the grains can decrease in this way, thus reduce the possibility of nucleation of reversal walls that may deteriorate the coercivity.…”

Section: Resultsmentioning

confidence: 99%

Magnetic properties of high coercivity Nd23Dy10Fe64TM2B1 sintered magnets by a convergent heat treatment

Kim

et al. 2010

Res Chem Intermed

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Section: Resultsmentioning

confidence: 99%

Magnetic properties of high coercivity Nd23Dy10Fe64TM2B1 sintered magnets by a convergent heat treatment

Kim

et al. 2010

Res Chem Intermed

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“…It is well-known that a magnet with high coercivity has high thermal stability [8], [9]. Therefore, we considered that an enhancement of the coercivity in the regions with large demagnetization field is effective to reduce in the flux loss.…”

Section: B Flux Loss In the Ring Magnet With Locally Enhanced Coercimentioning

confidence: 99%

Reduction in Flux Loss of an Nd-Fe-B Bonded Ring Magnet for an SPM Motor

et al. 2014

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We have previously proposed a simulation method of an initial flux loss in permanent magnets using finite element method, and confirmed that predicted flux loss of a Nd-Fe-B boned ring magnet showed good agreement with measured flux loss. In this study, we applied our proposed method to a Nd-Fe-B boned ring magnet in a SPM motor. We modeled a rotor composed of a Nd-Fe-B bonded ring magnet and a soft magnetic core made from silicon steels, and carried out the simulations for magnetizing process and prediction process of the flux loss. From the simulation results, we found that the inner side of the ring magnet has large flux loss. In order to reduce in the flux loss, we enhanced the coercivity in the inner side of the ring magnet by partial replacement with another bonded magnet with high coercivity. Consequently, we found that the ring magnet with locally enhanced coercivity is effective to reduce in the flux loss.

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“…The technique of strip casting is helpful for the starting R-Fe-B alloy to uniformly disperse RE-rich phase and depress the growth of α-Fe phase. 32 With optimized structure of tundish the temperature in melt pool keeps homogeneous during alloy cast. 33 Together with optimized wheel spinning rate an ideal microstructure of strip-casting alloy have been achieved.…”

Section: B Microstructure Of Magnets and Related Alloysmentioning

confidence: 99%

Study of sintered Nd-Fe-B magnet with high performance of Hcj (kOe) + (BH)max (MGOe) > 75

Niu

Zhao

et al. 2013

AIP Advances

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We have developed a Nd-Fe-B sintered magnet of extremely high performance. The intrinsic coercivity Hcj is as high as 35.2 kOe (2803kA/m) together with the maximum energy product (BH)max of 40.4 MGOe (321.6kJ/m3). These values result in Hcj (kOe) + (BH)max (MGOe) > 75. Between 293 K (20ºC) and 473 K (200ºC), the temperature coefficients of remanence and intrinsic coercivity are αBr = −0.122 %/°C and αHcj = −0.403%/°C, respectively. A maximum operating temperature of 503 K (230ºC) is obtained when permeance coefficient Pc = −B/H = 2. Grain boundary diffusion (GBD) technique on magnet surface has been developed to increase Hcj by 3.6 kOe without significantly decrease of Br and (BH)max. The intrinsic coercivity of the GBD treated magnet Hcj(C) has a linear relationship with that of the untreated magnet Hcj(B) between 200 K and 473 K (in unit of kOe): Hcj(C) = 1.03Hcj(B) + 2.38. The enhancement of Hcj by GBD treatment has contributions not only from the improvement of microstructure but also from the increase of Ha in the grain surface layer. It is also found that GBD treatment brings no deterioration in corrosion resistance of untreated magnet.

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Study of high-coercivity sintered NdFeB magnets

Cited by 146 publications

References 8 publications

Magnetic properties of high coercivity Nd23Dy10Fe64TM2B1 sintered magnets by a convergent heat treatment

Magnetic properties of high coercivity Nd23Dy10Fe64TM2B1 sintered magnets by a convergent heat treatment

Reduction in Flux Loss of an Nd-Fe-B Bonded Ring Magnet for an SPM Motor

Study of sintered Nd-Fe-B magnet with high performance of Hcj (kOe) + (BH)max (MGOe) > 75

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Study of high-coercivity sintered NdFeB magnets

Cited by 146 publications

References 8 publications

Magnetic properties of high coercivity Nd23Dy10Fe64TM2B1 sintered magnets by a convergent heat treatment

Magnetic properties of high coercivity Nd23Dy10Fe64TM2B1 sintered magnets by a convergent heat treatment

Reduction in Flux Loss of an Nd-Fe-B Bonded Ring Magnet for an SPM Motor

Study of sintered Nd-Fe-B magnet with high performance of Hcj (kOe) + (BH)max (MGOe) &gt; 75

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Study of sintered Nd-Fe-B magnet with high performance of Hcj (kOe) + (BH)max (MGOe) > 75