POWDER TECHNOLOGIES AND ADDITIVES Products Company Binder System Consultancy/Support Contact R&D Home Technology Technology Metal- and ceramic injection moulding (MIM, CIM) are innovative and competitive technologies for producing complex shaped parts from metals and ceramics in higher volumes. This technology combined two well-known shaping methods, the plastic injection moulding and the conventional powder metallurgy and sintering technology with sintering of pressed metal or ceramic powders. To use injection moulding machines for injection moulding of very fine metal and ceramic powders, these powders have to be mixed with several polymers (binder system). This mixture is called “feedstock”. The ratio of metal powders in this mixture is up to 97 weight%, these of ceramic powders around 80 to 85 weight%. Behind injection moulding of so called green part, polymers will be extracted from part by a solvent (debinding process). After them a sintering process at high temperatures follows. Thus the parts get there final properties. All processing steps schematically:  Feedstock production injection moulding debinding sintering post sintering treatment If wished or by application condition required, a finishing treatment of parts is possible (like heat treatment, surface treatment, mechanical treatment, grinding drilling a.s.o.) Some advantages of MIM and CIM - producing of complex shaped part without mechanical treatment - wide range of different materials is usable, like titanium, hard metals, heavy metal alloys like tungsten iron nickel, super alloys, oxide and non oxide ceramic and much other material - excellent material properties mostly comparable with properties of mechanical treated parts - smooth surfaces with highest surface quality, Ra<2 - closest tolerances without finishing treatment  up to 0,15% depending of part size The economic efficiency is given at the following requirements: - producing complex shaped part without treatment, for instance with undercuts - non mechanical treatable materials has to be used, like hard metals high speed steals, but also pure copper - materials combination which can not be produced by melting metallurgy, like tungsten-copper - parts with geometric details, like finest fin structures, has to be produced - volume of parts is big enough, for instance > 10.000 parts per year The economic efficiency reaches their limits if: - the weight per part is >> 100g it means the material cost increase rapidly by using fine powders - the cots for sintering process have to be allocate on a low number of parts - the tooling costs have to be allocate on a low number of parts