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Manufacturing of multi-functional micro parts by two-component metal injection moulding

: Imgrund, P.; Rota, A.; Petzoldt, F.; Simchi, A.


The International Journal of Advanced Manufacturing Technology 33 (2007), No.1-2, pp.176-186
ISSN: 0268-3768
ISSN: 1433-3015
Journal Article
Fraunhofer IFAM ()
Mikrobearbeitung; Pulvermetallurgie; Sintermetall; nichtrostender Stahl; Metallspritzgießen; Mikrofertigung; Verfahrensparameter

Several metals and alloys can be used to enhance the mechanical and physical properties of micro parts and components for micromechanical, micro-chemical or sensor applications. Such parts can be produced in series by the powder metallurgical process of micro metal injection moulding (my-MIM). This paper describes a novel manufacturing route for metallic multi-material micro components, two-component micro metal injection moulding (2C- my-MIM). Similar to 'two-colour' injection moulding of plastics, the process allows the integration of multiple functions in a micro part by simultaneously injecting and joining two materials in one mould. Net-shape parts with solid material interfaces are obtained. In this paper, the 2C-my-MIM process is exemplified for the combination of a non-magnetic and a ferromagnetic stainless steel (316 L and 17-4PH). It is shown that intact material interfaces of less than 500 x 500 micrometres(exp 2) can be achieved by careful selection and tailoring of metal powders, injection moulding and co-sintering parameters.
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