Powder metal injection molding process for forming an...

B - Operations – Transporting – 22 – F

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B22F 3/22 (2006.01) B22F 3/10 (2006.01)

Patent

CA 2342328

A molding compound consisting of the nickel superalloy Hastelloy X is used to form net-shape or near net-shape articles. The compound, containing atomized Hastelloy X powder having an average particle size less than about 20µm, is mixed with a liquid carrier, a gel forming binder and processing additives and molded at relatively low pressures in a conventional injection molding machine. A critical air debinding step prior to sintering results in high densification of the article, which has mechanical properties comparable to cast or wrought processed material.

L'invention concerne un mélange à mouler composé du superalliage de nickel Hastelloy X, ce mélange étant utilisé pour former des articles de finition immédiate ou des articles de finition presque immédiate. Ce mélange, qui contient de la poudre d'Hastelloy X atomisée dont la taille moyenne des particules est inférieure à 20µm environ, est mélangé à un excipient liquide, à un liant gélifiant, et à des additifs de traitement, avant d'être moulé à des pressions relativement faibles dans une machine de moulage par injection traditionnelle. Cette invention concerne également une étape critique d'élimination du liant à l'air, cette étape se déroulant avant le frittage et permettant d'obtenir un article dont la densification est élevée et les propriétés mécaniques comparables à celle d'un matériau coulé ou corroyé.

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