Ferromagnetic powder composition and method for its production

B - Operations – Transporting – 22 – F

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B22F 1/02 (2006.01) H01F 1/24 (2006.01)

Patent

CA 2717676

The present invention concerns a ferromagnetic powder composition comprising soft magnetic iron-based core particles, wherein the surface of the core particles is provided with a first inorganic insulating layer and at least one metal-organic layer, located outside the first layer, of a metal-organic compound having the following general formula: (R1[(R1)x(R2)y(MO n-1)]n R1, wherein M is a central atom selected from Si, Ti, Al, or Zr; 0 is oxygen; R1 is a hydrolysable group; R2 is an organic moiety and wherein at least one R2 contains at least one amino group; wherein n is the number of repeatable units be-ing an integer between 1 and 20; wherein the x is an integer between 0 and 1; wherein y is an integer between 1 and 2; wherein a metallic or semi- metallic particulate compound having a Mohs hardness of less than 3.5 being adhered to at least one metal-or-ganic layer; and wherein the powder composition further comprises a particulate lubricant. The invention further concerns a process for producing the composition and a method for the manufacturing of soft magnetic composite components prepared from the composition, as well as the obtained component.

La présente invention concerne une composition de poudre ferromagnétique comprenant des particules noyau à base de fer magnétique doux. La surface de ces particules noyau est pourvue d'une première couche isolante inorganique, et d'au moins une couche organométallique située à l'extérieur de la première couche et faite d'un composé organométallique représenté par la formule générale (R1[(R1)x(R2)y(MOn-1)]nR1. Dans cette formule, M est un atome central choisi dans le groupe Si, Ti, Al ou Zr. R1 est un groupe hydrolysable. R2 est une fraction organique, l'un au moins des R2 contenant au moins un groupe aminé. Le "n" est un entier de 1 à 20 correspondant au nombre de motifs répétitifs. Le "x" est un entier valant 0 ou 1. Le "y" est un entier valant 1 ou 2. Un composé particulaire métallique ou semi-métallique d'une dureté inférieure à 3,5 sur l'échelle de Mohs adhère à au moins une couche organométallique. Enfin, la composition de poudre comprend également un lubrifiant particulaire. L'invention concerne également un processus de production de la composition, et un procédé de fabrication des composants composites magnétiques doux élaborés à partir de la composition, ainsi que les composants obtenus.

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