Powder and binder systems for use in powder molding

B - Operations – Transporting – 22 – F

Patent

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Details

B22F 1/00 (2006.01) B22F 3/10 (2006.01) B22F 3/22 (2006.01) C04B 35/634 (2006.01)

Patent

CA 2230994

Provided is a powder and binder system for manufacturing sintered parts from particulate material, and a method of injection molding parts for sintering. The particulate material includes ceramic, metallic and intermetallic powders. Preferably, selected powder particles are coated with one or more additives depending on theirs shape and surface chemistry to create a powder system. The additives may include antioxidants, coupling agents, surfactants, elasticizing agents, dispersants, plasticizer/compatibilizers and lubricants. The surface active additives are designed to improve the interface between the powder and the binder. The powder system may be mixed or compounded with a binder system in an inert atmosphere to form a powder and binder system, or feedstock, for powder molding. The binder system may contain one or more components which are removed prior to sintering the powder. The powder and binder system may also be molded about an expendable core which is extracted prior to sintering.

L'invention porte sur une poudre et un liant destinés à la production de pièces frittées à partir de matière particulaire ainsi que sur un procédé de moulage par injection de pièces à fritter. La matière particulaire comporte des poudres de céramique, métalliques et intermétalliques. On enrobe les particules de poudre sélectionnées, de préférence, d'un ou plusieurs produits d'addition en fonction de la forme et des propriétés chimiques de surface des particules, afin de constituer un système pulvérulent. Parmi ces produits d'addition peuvent figurer des antioxydants, des agents de couplage, des agents tensioactifs, des agents d'élastification, des dispersants, des plastifiants/agents de compatibilisation et des lubrifiants. Ces produits d'addition sont destinés à améliorer l'interface entre la poudre et le liant. Il est possible de mélanger le système pulvérulent ou d'en faire un composé avec un liant dans une atmosphère inerte afin de constituer un système pulvérulent et liant ou charge d'alimentation pour le moulage à partir de poudre. Le liant peut contenir un ou plusieurs composants que l'on retire avant de fritter la poudre. Il est également possible de mouler le système pulvérulent et liant autour d'un noyau non réutilisable qui est enlevé avant le frittage.

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