Schafter, T.T.SchafterBurghaus, J.J.BurghausPieper, W.W.PieperPetzoldt, F.F.PetzoldtBusse, M.M.Busse2022-03-052022-03-052015https://publica.fraunhofer.de/handle/publica/24093610.1179/1743290114Y.00000001212-s2.0-84939152739The present paper introduces a new concept of a sintered soft magnetic composite (SSC): a combination of a sintered soft magnet and soft magnetic composite. The approach is to create a Fe-Si based bulk material with a microstructure of Si rich, highly insulating ferromagnetic particle boundary phases by a high temperature heat treatment (sintering). The concept is realised via a powder metallurgical route, starting from an initial mixture of iron, silicon and copper. Silicon forms a graded boundary phase around the iron particles. Copper is added to reduce the melting point of the silicon and to ensure a uniform wetting of the silicon-rich layer around the iron particles. A systematic composition range of such sintered materials are evaluated as to magnetic and mechanical properties. The best material composition found has 96 wt-% iron + 3wt-% silicon+1 wt-% copper with the optimum sintering parameters of 1050 to 1100 °C for 30 min in a nitrogen atmosphere.en620660671journal article