Iron base powder mixture for powder metallurgy excellent in...

B - Operations – Transporting – 22 – F

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B22F 1/02 (2006.01) B22F 1/00 (2006.01) B22F 9/02 (2006.01) C22C 33/02 (2006.01)

Patent

CA 2255861

An iron base powder mixture capable of providing excellent fluidity at room temperature and in a warm state and reducing an extruding force in molding and having improved moldability; a method of production of this mixture; and a method of production of a high density molded article by using the mixture. The iron base powder mixture contains iron base powder, a lubricant and alloying powder, and at least one of the components is coated with at least one surface treating agent selected from the group consisting of organoalkoxysilanes, organosilazanes, titanate coupling agents and fluorocoupling agents. The iron base powder mixture is press-molded at a temperature higher than the lowest melting point but lower than the highest melting point of the lubricants contained in the mixture.

Cette invention se rapporte à un mélange pulvérisé à base de fer susceptible de posséder une excellente fluidité à température ambiante et à l'état chaud et de réduire la force d'extrusion lors du moulage, et présentant une aptitude améliorée au moulage. L'invention concerne également un procédé de fabrication de ce mélange et un procédé de fabrication d'un article moulé de densité élevée à partir dudit mélange. Ce mélange pulvérisé à base de fer contient une poudre à base de fer, un lubrifiant et une poudre d'alliage, l'un au moins de ces composants étant enduit avec au moins un agent de traitement de surface sélectionné dans le groupe constitué par les organoalcoxysilanes, les organosilazanes, des agents de fluorocouplage et des agents de couplage à base de titanate. Ce mélange pulvérisé à base de fer est pressé-moulé à une température supérieure au point de fusion le plus faible mais inférieure au point de fusion le plus élevé des lubrifiants contenus dans le mélange.

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