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Soft magnetic composites based on oriented short Fe fibres coated with polymer

This study presents the preparation and characterisation of soft magnetic composites (SMCs) in which the powders, that are generally used as the ferromagnetic phase, are replaced by short and thin Fe fibres. The Fe fibres (length of 3–7 mm and thickness of 70–110 μm) were coated with a layer of poly...

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Bibliographic Details
Published in:Journal of alloys and compounds 2020-11, Vol.840, p.155731, Article 155731
Main Authors: Neamţu, B.V., Irimie, A., Popa, F., Gabor, M.S., Marinca, T.F., Chicinaş, I.
Format: Article
Language:English
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Summary:This study presents the preparation and characterisation of soft magnetic composites (SMCs) in which the powders, that are generally used as the ferromagnetic phase, are replaced by short and thin Fe fibres. The Fe fibres (length of 3–7 mm and thickness of 70–110 μm) were coated with a layer of polymer that represents 1 wt% of the total weight of the fibres. To prepare the toroidal cores, three different mould filling techniques were used with the aim of orienting the fibres with their long axis parallel to the magnetising field. The compaction pressure for the preparation of all compacts was 700 MPa. The fibres used in this study were characterised via scanning electron microscopy (SEM) and vibrating sample magnetometry (VSM). The degree of fibres orientation inside the composite compacts was analysed via energy-dispersive X-ray spectroscopy (EDX). The fibres based composite compacts were analysed in static (DC) and dynamic (AC) magnetisation regime up to the frequency of 10 kHz. The DC and AC magnetisation measurements highlighted that the magnetic characteristics of the compacts increase upon increasing the degree of fibres orientation. A comparison of AC and DC magnetic characteristics of a fibres-based composite and a powder-based composite (prepared in identical conditions) is presented and discussed. •SMCs are prepared using short fibres coated with a polymeric layer.•The fibres were oriented by applying vibrations and a magnetic field.•Fibres-based composite presents superior DC properties as compared to classic SMC.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.155731