Abstract
Soft magnetic composites (SMCs) of Fe3O4 particles coated with Al nanoparticles were prepared using the rotating magnetic field method, and the microwave absorption properties and microstructures of these composites were investigated. The results show that a well-distributed Al nanoparticles coating layer was formed on the surface of the Fe3O4 particles upon mechanical friction and rotating magnetic field distribution. Scanning electron microscopy and X-ray diffraction XRD studies show that the rotating magnetic field method can produce a uniform coating of the aluminium layer on the Fe3O4 particles. Compared with common composites from Fe3O4 particles, SMCs of Fe3O4(Al) particles have stronger magnetic loss behaviour and weaker dielectric loss ability, as well as good reflection characteristics over a wide frequency range. The minimum reflection loss (RL) is −16.2 dB at 12.0 GHz for a corresponding thickness of 5 mm obtained for SMCs of Fe3O4(Al) particles. The presented rotating magnetic field method used in the Fe3O4 particles coating process with Al nanoparticles has great potential in composite materials synthesis with different morphology and areas of application.
Highlights
Coatings 2021, 11, 621. https://Soft magnetic composites (SMCs), manufactured via powder metallurgy processing, are of significant interest in the field of core materials [1]
Fe3O4 particles, it is found in Figure 3 that calculated from the literature which had been installed in Keysight ENA calculated the ε0, ε00, μ0, and μ00 values
No 00these strong diffraction peaks at Derived from the X-raythe diffraction (XRD) pattern analysis of Fe3 O4 particles, it is found in Figure 3 that
Summary
Soft magnetic composites (SMCs), manufactured via powder metallurgy processing, are of significant interest in the field of core materials [1]. We designed a novel porous core-shell composite with dense particle a ferromagnetic conductor, the skin effect leads to a partial weakening of the internal packaging as a new type of microwave absorption materials using the rotational magneti magnetic field and, as a result, a deterioration in the complex permeability [15]. Porous core-shell composite dense particles packaging as a new type of microwavedensity absorption materials using thestructure); rotational magnetic ity to control particles packaging (from loose to dense (2) possibility t field method. For obtained composit ability to control particles packaging density (from loose to dense structure); (2) possibility materials the hypothesis of the skin effect influence on EM absorption characteristics i to provide core-coating process using the dynamic magnetic platform.
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