Abstract
Anisotropic bonded NdFeB permanent magnets have wide potential applications in the areas such as brushless DC motors, spindle motors, and stepping motors due to their excellent processing property and high magnetic properties. Anisotropic NdFeB bonded magnets prepared by hydrogen-disproportionation–desorption-recombination (HDDR) process have large energy product at room temperature. However, they are not stable at ∼100°C, which is the working temperature of many electric motors. In order to improve their thermal stability, we developed bonded NdFeB/SmCo magnets and investigated the effects of powder particle size and SmCo content on their magnetic properties. We proposed a model to clarify the filling effect of the powder, which played a key role in the enhanced (BH)max when reducing the SmCo particle size. As for the SmCo content, the bonded magnets showed improved (BH)max at 100°C-150°C and thermal stability with the increase of SmCo content. And through adjusting the SmCo content, the remanence temperature coefficient and coercivity temperature coefficient from 25-150°C were able to be regulated in the range of -0.14%/°C to -0.04%/°C and -0.51%/°C to -0.14%/°C, respectively. This work provides a design strategy and a facile route to improve the magnetic properties and thermal stability of the bonded magnets.
Highlights
Bonded permanent magnets have wide potential applications in the areas such as brushless DC motors, spindle motors, and stepping motors because they are easy to be made into desired shape directly without further machining.1–4 Compared with the isotropic bonded magnets, anisotropic NdFeB bonded magnets prepared by hydrogen-disproportionation–desorption-recombination (HDDR) powder have much larger energy product.4,5 they are not stable at ∼100○C, which is the working temperature of many electric motors
In order to improve their thermal stability, we developed bonded NdFeB/SmCo magnets and investigated the effects of powder particle size and SmCo content on their magnetic properties
It has been reported that the hybrid NdFeB/SmCo magnets showed improved thermal stability, increased magnetization and enhanced energy product compared with the NdFeB magnets
Summary
Bonded permanent magnets have wide potential applications in the areas such as brushless DC motors, spindle motors, and stepping motors because they are easy to be made into desired shape directly without further machining. Compared with the isotropic bonded magnets, anisotropic NdFeB bonded magnets prepared by hydrogen-disproportionation–desorption-recombination (HDDR) powder have much larger energy product. they are not stable at ∼100○C, which is the working temperature of many electric motors. Compared with the isotropic bonded magnets, anisotropic NdFeB bonded magnets prepared by hydrogen-disproportionation–desorption-recombination (HDDR) powder have much larger energy product.. Compared with the isotropic bonded magnets, anisotropic NdFeB bonded magnets prepared by hydrogen-disproportionation–desorption-recombination (HDDR) powder have much larger energy product.4,5 They are not stable at ∼100○C, which is the working temperature of many electric motors. SmCo magnets have good thermal stability, while their magnetic properties are relatively low as compared with NdFeB magnets at ∼100○C.6–8. It is known that in the bonded magnets, the powder particle size has a great influence on the magnetic properties. We prepared anisotropic bonded NdFeB/SmCo magnets and investigated the effects of powder particle size and SmCo content on the magnetic properties
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