Soft magnetic composites based on hybrid coated Fe-Si nanocrystalline powders

The preparation and characterisation of soft magnetic composite compacts based on hybrid coated nanocrystalline Fe-Si powder are presented. The Fe-Si powder was prepared by mechanical milling of Fe-Si electrical steels sheets up to 20h. The hybrid coating consists in an electrically insulating phosp...

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Bibliographic Details
Published in:Surface & coatings technology 2017-12, Vol.330, p.219-227
Main Authors: Neamţu, B.V., Nasui, M., Marinca, T.F., Popa, F., Chicinaş, I.
Format: Article
Language:English
Subjects:
Coating
Compacts
Core loss
Electrical steels
Hybrid coating
Influence
Iron
Magnetic permeability
Mechanical milling
Metal sheets
Nanocrystalline powder
Nanocrystals
Particulate composites
Permeability
Phosphating
Phosphating (coating)
Polymers
Silicon steels
Soft magnetic composite
Steel
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Summary:The preparation and characterisation of soft magnetic composite compacts based on hybrid coated nanocrystalline Fe-Si powder are presented. The Fe-Si powder was prepared by mechanical milling of Fe-Si electrical steels sheets up to 20h. The hybrid coating consists in an electrically insulating phosphate and a polymer layer that covers the Fe-Si particles. The influence of phosphating duration on the particles surface was investigated by SEM, EDX, XRD, and FTIR investigations. The saturation magnetisation of the powders phosphated for 60s decreases with 17% as compared to the uncoated powder. The influence of the compaction pressure, as well as the phosphating duration, on initial relative permeability and power losses of the compacts was investigated. It was found that increasing the compaction pressure leads to the increase of the compact's permeability and a decrease of the hysteresis losses. A shorter phosphating duration leads to a partial coating with phosphate of the Fe-Si particles and to compacts with higher density characterised by high magnetic permeability. •Dry milling of Fe-Si electrical steel leads to nanocrystalline powder.•Fe-Si particles were coated by a hybrid insulating coating.•After 60s. of phosphating, the particles are fully coated by a phosphate layer.•Soft magnetic composites were prepared using hybrid insulated particles.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2017.09.088