Powder metallurgy method for producing an extruded profile

Details Powder metallurgy method for producing an extruded profile Powder metallurgy method for producing an extruded profile

B - Operations, Transporting

22

F

B22F 3/20 (2006.01) B22F 1/00 (2006.01)

Patent

CA 2692925

In a method for producing a profile by extruding powdered metal and/or powdered metal alloys, a bulk powder material is heated to an extrusion temperature below the melting temperature of the powder and pressed under pressure through an opening of a die to form the profile. At least one metal or a metal alloy of the powder is a reactive metal spontaneously forming a natural oxide protective layer on a free surface and/or the powder contains fibre-like particles distributed homogeneously in the bulk powder material and absorbing microwave radiation. The bulk powder material is heated by microwave irradiation to extrusion temperature. The method achieves rapid and uniform heating in all regions of the bulk powder material.

L'invention concerne un procédé permettant de produire un profilé par extrusion de poudre de métal et/ou d'alliages métalliques, selon lequel de la poudre en vrac est portée à une température d'extrusion inférieure à la température de fusion de la poudre et est comprimée sous pression à travers l'ouverture d'une matrice pour former un profilé. Au moins un métal ou un alliage métallique de la poudre est un métal réactif formant spontanément une couche d'oxyde protectrice naturelle au niveau d'une surface libre et/ou la poudre contient des particules fibreuses absorbant le rayonnement micro-onde et réparties de manière homogène dans la poudre en vrac. La poudre en vrac est portée à température d'extrusion par rayonnement micro-onde. Le procédé permet de chauffer de manière homogène toutes les zones de la poudre en vrac.

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