Lubricants for insulated soft magnetic iron-based powder...

B - Operations – Transporting – 22 – F

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B22F 1/00 (2006.01) C22C 33/02 (2006.01) H01F 1/24 (2006.01)

Patent

CA 2571777

The invention concerns a powder metallurgical composition containing, preferably a coarse, soft magnetic iron or iron-based powder, wherein the particles are surrounded by an insulating inorganic coating and as lubricant at least one non-drying oil or liquid having a crystalline melting point below 25~C, a viscosity (.eta.) at 40 ~C above 15 mPas and wherein said viscosity is temperature dependent according to the following formula: 10 log .eta. =k/T +C wherein the slope k is above 800 T is in Kelvin and C is a constant in an amount between 0.05 and 0.4 % by weight of the composition.

L'invention concerne une composition métallurgique en poudre qui contient : de préférence, une poudre grossière à base de fer ou de fer à aimantation temporaire, dont les particules sont entourées par un revêtement inorganique isolant ; et, en tant que lubrifiant, au moins une huile ou un liquide de type non siccatif dont le point de fusion cristallin est inférieur à 25 °C. La viscosité (?) à 40 °C de la composition est supérieure à 15 mPas. La viscosité est dépendante de la température en fonction de la formule suivante : 10 log ? =k/T +C, la pente k étant supérieure à 800 ; T s'exprimant en Kelvin ; et C étant une constante à une quantité comprise entre 0,05 et 0,4 % en poids de la composition.

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