H - Electricity – 01 – F
Patent
H - Electricity
01
F
H01F 1/053 (2006.01) B22F 3/24 (2006.01) C22C 33/02 (2006.01) H01F 1/08 (2006.01) H01F 41/02 (2006.01) C22C 38/00 (2006.01)
Patent
CA 2685790
The invention aims at providing a process for the production of NdFeB sintered magnets which can bring about higher coercive force improving effect and smaller scattering of the effect and which enables the production of the magnets at a low cost. A process for the production of NdFeB sintered magnets which comprises applying a powder containing Dy and/or Tb to an NdFeB sintered magnet and heating the resulting magnet to diffuse the Rh contained in the powder into the magnet through grain boundaries, characterized in that the powder contains 0.5 to 50wt% of metallic Al and the oxygen content of the NdFeB sintered magnet is 0.4wt% or below.
L'invention a pour objet un processus permettant la production d'aimants frittés NdFeB qui peut amener un effet d'amélioration de la force coercitive plus important et une plus fiable diffusion de l'effet et qui permet la production des aimants à un faible coût. Le processus permettant la production d'aimants frittés NdFeB selon la présente invention qui comprend les étapes consistant à appliquer une poudre contenant Dy et/ou Tb sur un aimant fritté NdFeB et à chauffer l'aimant résultant afin de diffuser le Rh contenu dans la poudre dans l'aimant à travers les joints de grain, est caractérisé en ce que la poudre contient 0,5 à 50 % en poids d'Al métallique et la teneur en oxygène de l'aimant fritté NdFeB est inférieure ou égale à 0,4 % en poids.
Goudreau Gage Dubuc
Intermetallics Co. Ltd.
LandOfFree
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