A low oxygen iron powder and method for the manufacturing...

B - Operations – Transporting – 22 – F

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B22F 1/02 (2006.01) B22F 1/00 (2006.01) C23C 22/03 (2006.01) H01F 1/20 (2006.01) H01F 1/24 (2006.01)

Patent

CA 2247150

The invention concerns a novel low oxygen powder comprising particles of a base powder consisting of essentially pure iron having an insulating oxygen- and phosphorus-containing barrier. The oxygen content of the new powder is at most 0.2 % by weight higher than the oxygen content of the base powder, and the ratio O:P is between 30 and 1, preferably between 15 and 2 and most preferably between and 3 as measured by the ESCA method. The invention also concerns a new method of preparing an iron-based powder comprising the steps of preparing a base powder consisting of a water atomised iron powder or a sponge iron powder, subjecting the mixture to treatment with a solution of phosphoric acid in an organic solvent and drying the obtained mixture, whereby the solution of phosphoric acid is sprayed on the base powder white being mixed.

Nouvelle poudre de fer à faible teneur en oxygène constituée de particules d'une poudre de base elle-même constituée de fer essentiellement pur renfermant un écran isolant contenant de l'oxygène et du phosphore. La teneur en oxygène de cette nouvelle poudre est au maximum de 0,2 % en poids plus élevée que la teneur en oxygène de la poudre de base, tandis que le rapport O/P est compris entre 30 et 1 et se situe de préférence entre 15 et 2 et, idéalement, entre 10 et 3, selon les résultats de l'analyse chimique par spectroscopie électronique (ESCA). L'invention porte également sur une nouvelle méthode d'élaboration d'une poudre à base de fer, cette méthode consistant à préparer une poudre de base constituée d'une poudre de fer ou de fer spongieux atomisée dans l'eau, à soumettre ce mélange à un traitement au moyen d'une solution d'acide phosphorique dans un solvant organique puis à assécher le mélange obtenu, la solution d'acide phosphorique étant diffusée sur la poudre de base au cours du mélange.

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