Powder magnetic core and processes for producing the same

Details Powder magnetic core and processes for producing the same Powder magnetic core and processes for producing the same

H - Electricity

01

F

H01F 1/18 (2006.01) B22F 1/00 (2006.01) B22F 3/12 (2006.01) B22F 3/24 (2006.01) H01F 1/24 (2006.01) H01F 3/08 (2006.01) H01F 41/02 (2006.01)

Patent

CA 2435149

The present invention is characterized in that, in a powder magnetic core obtained by compaction of an iron-based magnetic powder covered with an insulation film, a saturation magnetization Ms is Ms >= 1. 9T in a 1.6 MA/m magnetic field; a specific resistance .RHO. is .RHO. .gtoreq .1.5 µ .OMEGA. m; a magnetic flux density B2k is B2k 1.1T in a 2 kA/m magnetic field; and a magnetic flux density B10k is B10k ~ 1.6T in a 10 kA/m magnetic field. In accordance with the present invention, it has been possible to industrially carry out compacting iron-based magnetic powders under remarkably high compacting pressures. As a result, high-performance powder magnetic cores are obtained which have a high density, and which are good in terms of the specific resistance and magnetic permeability.

Noyau aggloméré produit par compactage d'une poudre magnétique à base de fer couverte d'un revêtement isolant, caractérisé en ce que l'aimantation à saturation est de M >/= 1,9T dans un champ de 1,6 MA / m, la résistance spécifique est de rho >/= 1,5 µ O m, la densité de flux est de B2k >/= 1,1T dans un champ de 2 kA/m, et la densité de flux est de B10k >/= 1,6T dans un champ de 10 kA/m. Selon la présente invention, une poudre magnétique à base de fer peut être compactée industriellement à une pression de moulage élevée, ce qui permet d'obtenir un noyau aggloméré à haute performance présentant une densité élevée et une résistance spécifique ainsi qu'une perméabilité excellentes.

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