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Microinjection moulding of 316L/17-4PH and 316L/Fe powders for fabrication of magnetic-nonmagnetic bimetals

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


Journal of materials processing technology 200 (2008), Nr.1-3, S.259-264
ISSN: 0924-0136
Fraunhofer IFAM ()
Bimetall; magnetischer Werkstoff; Metallspritzgießen; ultrafeines Pulver; Bindemittel; Sinterverhalten; Vorlegierung; nichtrostender Stahl; Carbonylpulver; Chromlegierung; Mikrogefüge; Fehlanpassung; Verformung

In the investigations presented here, the feasibility of producing magnetic-nonmagnetic bimetals made of 3161/17-4PH and 316L/Fe powders by micro-metal injection moulding process (micron-MIM) was studied. In order to achieve sound replication of small specimens with dimensions less than 1 mm, very fine powders with mean particle sizes in the range of 3-7 micrometer were used. A wax-polymer binder system specially designed for micro-moulding was used to make up the feedstock. The isothermal and non-isothermal sintering behaviour of the moulded components was evaluated under hydrogen atmosphere. The effect of powder-binder-ratio of the feedstock, master alloy addition, and sintering conditions on the co-sintering compatibility between the components was investigated. In this study, 316L and 17-4PH showed the best co-sintering compatibility and sound joining of the materials was achieved. When combining 316L and iron, using a 316L master alloy (MA) mixed from NiCrMo and iron powder reduced the mismatch incompatibility with plain iron from 12.7% to 1.6%. So the 316L/17-4PH and 316L MA/Fe were found to be suitable for micro-co-injection moulding. The systems can be used for fabrication of small magnetic-nonmagnetic bimetals with contact areas less than 1 mm(exp 2).
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