Metal injection moulding method

B - Operations – Transporting – 22 – F

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B22F 3/10 (2006.01) B22F 3/16 (2006.01)

Patent

CA 2660484

A method for forming an article by metal injection moudling of aluminium or an aluminium alloy. The method comprises the steps of forming a mixture containing an aluminium powder or an aluminum alloy powder or both and optionally ceramic particles, a binder, and a sintering aid comprising a low melting point metal. The mixture is injection moulded and the binder is removed to form a green body. The green body is sintered. The sintering is conducted in an atmosphere containing nitrogen and in the presence of an oxygen getter.

L'invention concerne un procédé pour former un article par moulage par injection de métal d'aluminium ou d'un alliage d'aluminium. Le procédé comprend les étapes de formation d'un mélange contenant une poudre d'aluminium ou une poudre d'un alliage d'aluminium, ou les deux, et éventuellement des particules de céramique, un liant et un précurseur de frittage comprenant un métal à bas point de fusion. Le mélange est moulé par injection et le liant est enlevé pour former un corps vert. Le corps vert est fritté. Le frittage est réalisé dans une atmosphère qui contient de l'azote et en présence d'un capteur d'oxygène.

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