Special FeatureSoft magnetic composites: recent advancements in the technology
Section snippets
Processing steps
The processing methods to form SMCs often follow conventional powder metallurgy techniques, such as milling or mixing of metal powder potentially with alloying elements, compacting, curing, and secondary operations, as depicted in Fig. 2. Milling of various elemental powder allows for the development of mechanically alloyed core materials, often annealed to control grain size and increase magnetic permeability [6]. Smaller grain sizes, nominally nanocrystalline materials have very high
Material selection
By and large, selecting the proper material for any application is of the utmost importance. SMCs require materials with superb soft magnetic properties to be functional at the desired frequency and possess the mechanical integrity to be handled in a manufacturing facility and perform at high speeds. The soft magnetic properties of interest include high magnetic permeability (high magnetic saturation and low coercivity), which are obtained by the least amount of nonmagnetic inclusions. A great
Future of SMCs
SMCs require low core losses and high magnetic permeability at various frequency ranges for diverse applications such as aerospace and automobiles. The future of SMCs lies in balancing high electrical resistivity, high mechanical strength, and high magnetic performance utilizing both a core and coating material, or maybe a new class of materials. Such as an Fe–Si–Cu composition that allows for improved mechanical strength and electrical resistivity without decreasing magnetic properties greatly
Acknowledgements
The authors gratefully acknowledge support in part from the National Science Foundation under contract 1031403, and in part from the Hoeganaes Corporation.
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