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Improving sintered NdFeB permanent magnets by powder compaction in a 9 T superconducting solenoid

Identifieur interne : 001D79 ( Main/Exploration ); précédent : 001D78; suivant : 001D80

Improving sintered NdFeB permanent magnets by powder compaction in a 9 T superconducting solenoid

Auteurs : T. M. Mulcahy [États-Unis] ; J. R. Hull [États-Unis] ; E. Rozendaal [États-Unis] ; J. H. Wise [États-Unis] ; L. R. Turner [États-Unis]

Source :

Journal of applied physics [ 0021-8979 ] ; 2003-05-15.

RBID : Pascal:03-0231863

Descripteurs français

Pascal (Inist)
- 7550W, 7550B, 8120E, 8105B, 0755D, 7560E, Etude expérimentale, Fer alliage, Néodyme alliage, Matériau ferromagnétique, Bore alliage, Aimant permanent, Frittage, Métallurgie poudre, Traitement thermomagnétique, Rémanence.

English descriptors

KwdEn :
- Boron alloys, Experimental study, Ferromagnetic materials, Iron alloys, Neodymium alloys, Permanent magnets, Powder metallurgy, Remanence, Sintering, Thermomagnetic treatment.

Abstract

Commercial-grade magnet powder (Magnequench UG) was axial die pressed in the 76.2 mm warm bore of a 9 T superconducting solenoid. Otherwise, processing was performed as part of normal factory operations. This pressing was done to improve the alignment of the anisotropic single-crystal particles of the compact and, thus, the remanent magnetization of the sintered cylindrical permanent magnets (12.7 mm diameter). Although the press was operated in batch mode for this proof-of-concept study, its design enables automated production. Improvements of up to 8% in magnetization and 16% in energy products were obtained, as the alignment field H was increased above the 2 T maximum field of electromagnets used in industry. The greatest improvements were obtained for magnets with the smallest length-to-diameter ratios, L/D<0.5. The production of quality magnets in this near-final-shape size range is currently being pursued by industry to eliminate expensive machining steps. To understand the potential for 2-8 T alignment fields to overcome the distortions created in the otherwise uniform field by the self-field of short compacts, electromagnetic code (Opera) calculations were made. A simple material model was used to predict the distortions. The trends in the predicted field-line inclinations, with L/D and H, compare to trends in the improvement of the magnetic properties. © 2003 American Institute of Physics.

Affiliations:

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Le document en format XML

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<front><div type="abstract" xml:lang="en">Commercial-grade magnet powder (Magnequench UG) was axial die pressed in the 76.2 mm warm bore of a 9 T superconducting solenoid. Otherwise, processing was performed as part of normal factory operations. This pressing was done to improve the alignment of the anisotropic single-crystal particles of the compact and, thus, the remanent magnetization of the sintered cylindrical permanent magnets (12.7 mm diameter). Although the press was operated in batch mode for this proof-of-concept study, its design enables automated production. Improvements of up to 8% in magnetization and 16% in energy products were obtained, as the alignment field H was increased above the 2 T maximum field of electromagnets used in industry. The greatest improvements were obtained for magnets with the smallest length-to-diameter ratios, L/D<0.5. The production of quality magnets in this near-final-shape size range is currently being pursued by industry to eliminate expensive machining steps. To understand the potential for 2-8 T alignment fields to overcome the distortions created in the otherwise uniform field by the self-field of short compacts, electromagnetic code (Opera) calculations were made. A simple material model was used to predict the distortions. The trends in the predicted field-line inclinations, with L/D and H, compare to trends in the improvement of the magnetic properties. © 2003 American Institute of Physics.</div>
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Improving sintered NdFeB permanent magnets by powder compaction in a 9 T superconducting solenoid

Improving sintered NdFeB permanent magnets by powder compaction in a 9 T superconducting solenoid

Source :

Descripteurs français

English descriptors

Abstract

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