Improved metallurgical compositions containing binding...

B - Operations – Transporting – 22 – F

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B22F 1/02 (2006.01) B22F 3/12 (2006.01)

Patent

CA 2307109

Improved methods for coating particulate materials at low shear conditions and preferably below the melting point of the coating material are provided. In one aspect, metallurgical compositions are provided that contain a metal-based powder bound to an alloying powder or powders by way of a low melting polymer or wax binding agent, which is preferably polyethylene. The binding agent is blended with the metal-based and alloying powders at elevated temperatures preferably below the melting point of the binding agent. The bonded metallurgical composition can be used in compaction processes to manufacture compacted parts that can be sintered to impact strength.

La présente invention concerne des procédés améliorés de revêtement au moyen de matériaux particulaires dans des conditions de cisaillement amoindries, et de préférence en dessous du point de fusion du matériau de revêtement. Selon un aspect, les compositions de l'invention contiennent une poudre à base métallique liée à une ou plusieurs poudres d'alliage au moyen d'un liant polymère à faible point de fusion ou d'un liant à base de cire, de préférence un polyéthylène. Le liant est mélangé à la poudre à base métallique et à la poudre d'alliage à des températures élevées, de préférence en dessous du point de fusion du liant. La composition métallurgique liée convient, dans les opérations de compactage, pour la fabrication de pièces compactées pouvant être cintrées pour en améliorer la résistance.

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