Methods for preparing metallurgical powder compositions and...

B - Operations – Transporting – 22 – F

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B22F 1/00 (2006.01) B22F 3/12 (2006.01)

Patent

CA 2636906

Provided are methods of preparing high density compacted components that increase that lubricity of metallurgical powder compositions while reducing the overall organic content of the compacted component. Method of preparing high density compacted components having a high density include the steps of providing a metallurgical powder composition having particles at least partially coated with a metal phosphate layer, and compacting the metallurgical powder composition in the die at a pressure of at least about 5 tsi. The metallurgical powder composition comprises a base- metal powder, optional alloying powders, and a particulate internal lubricant. The metal phosphate at least partially coats the base-metal powder, the optional alloying powder, or both. The metal phosphate coating increases the lubricity of metallurgical powders without the need for large quantities of organic material, e.g., lubricants and binders.

Procédés de préparation de pièces compactées de haute densité, qui augmentent le pouvoir lubrifiant de compositions de poudres métallurgiques, tout en réduisant la teneur organique totale de la pièce compactée. Un procédé de préparation de pièces compactées ayant une densité élevée consiste à utiliser une composition de poudre métallurgique contenant des particules au moins en partie enrobées par une couche de phosphate de métal, et à compacter ladite composition de poudre métallurgique dans la matrice à une pression d'au moins environ 5 tsi. Ladite composition de poudre métallurgique contient une poudre de métal de base, éventuellement des poudres d'alliage et un lubrifiant particulaire interne. Le phosphate de métal enrobe au moins en partie la poudre de métal de base, la poudre d'alliage éventuelle ou les deux. L'enrobage de phosphate de métal augmente le pouvoir lubrifiant des poudres métallurgiques sans qu'il soit nécessaire d'ajouter des grandes quantités de matière organique, à savoir de lubrifiants et de liants.

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