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New concept of Si-Fe based sintered soft magnetic composite

: Schafter, T.; Burghaus, J.; Pieper, W.; Petzoldt, F.; Busse, M.


Powder Metallurgy 58 (2015), No.2, pp.106-111
ISSN: 0032-5899
ISSN: 1743-2901
Journal Article
Fraunhofer IFAM ()

The 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.