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Applied Sciences
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Soft Magnetic Composite Materials and Alloys
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Soft Magnetic Composite Materials and Alloys

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Applied Physics General".

Deadline for manuscript submissions: closed (30 September 2021) | Viewed by 4066

Special Issue Editors

Dr. Emir Poskovic

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Guest Editor
Energy “G. Ferraris” Department, The Polytechnic University of Turin, 10129 Turin, Italy
Interests: soft and hard magnetic materials; magnetic measurement; electrical machines; alternative and renewable energy; thermographic iron losses detection
Special Issues, Collections and Topics in MDPI journals
Dr. Fausto Franchini

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Guest Editor
Department of Energy, Politecnico di Torino, 10129 Torino, Italy
Interests: ingegneria elettrica; macchine elettriche; materiali
Prof. Dr. Mitra Taheri

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Guest Editor
Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA
Interests: in situ and analytical electron microscopy; structural, electronic, and magnetic materials; bio materials; extreme environments; additive manufacturing

Special Issue Information

Dear Colleagues,

This Special Issue will cover the preparation, characterization, analysis, and applications of soft magnetic composite materials, powders, and alloys, to evaluate and obtain the appropriate materials for electrical machines, electronic conversion devices, and telecommunication equipment.

This Special Issue will include but is not limited to the following topic:

  • Soft magnetic composite materials and alloys preparation and characterization, organic and inorganic layer for ferromagnetic powder, amorphous powder, iron-silicon powder, particle sizes effects, covering techniques and insulated materials used in soft magnetic composite materials, magnetic powder SEM analysis to assess the magnetic properties and microstructures, production process: compression and additive manufacturing;
  • Iron losses measurements and analysis, eddy currents hysteresis and excess losses separation, initial permeability measurements, novel or optimized measurement techniques;
  • FE Analysis of magnetic behavior related to magnetic structures, Bertotti Model and others for Soft Magnetic Composite Materials and Alloy;
  • Applications in electrical machines, electronic conversion devices, and telecommunication sectors, low and high frequency uses, other applications.

You may choose our Joint Special Issue in Magnetochemistry.

Dr. Emir Poskovic
Dr. Fausto Franchini
Prof. Dr. Mitra Taheri
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • soft magnetic composite
  • SMC
  • soft magnetic alloys
  • amorphous powder
  • iron-silicon powder
  • magnetic powder
  • inorganic and organic layer
  • magnetic oxides materials
  • ferrites powders
  • epoxy and phenolic resins
  • iron losses
  • magnetic characterization
  • initial permeability measurements
  • compression molding
  • additive manufacturing

Published Papers (2 papers)

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Research

14 pages, 4553 KiB  
Article
Effect of the Insulating Layer on the Properties of SMC Inductors
by Emir Pošković, Fausto Franchini and Luca Ferraris
Appl. Sci. 2022, 12(17), 8756; https://0-doi-org.brum.beds.ac.uk/10.3390/app12178756 - 31 Aug 2022
Cited by 4 | Viewed by 1551
Abstract
In inductor applications, different soft magnetic materials are used depending on the frequency range. Owing to powder metallurgy technology and to the increase in the implementation of innovative multifunctional materials, it is possible to find an alternative to the traditional magnetic materials of [...] Read more.
In inductor applications, different soft magnetic materials are used depending on the frequency range. Owing to powder metallurgy technology and to the increase in the implementation of innovative multifunctional materials, it is possible to find an alternative to the traditional magnetic materials of the inductance application sector. This study concerns a deep analysis related to soft magnetic composite materials. The insulating layer’s effect is investigated to explore the applicability of such materials to the inductor sector. Four coatings systems are selected and two types of samples are prepared in the shape of a toroid and a rod, which are tested in different operating conditions. The rod inductors are also compared with a traditional one, based on soft ferrite materials. This work aims to integrate data coming from different measuring devices: the useful small-signal measurements of an RLC meter are completed by large-cycle data measured through a hysteresigraph. Different parameters are considered for the investigation: magnetic permeability (maximum and initial), iron losses at different induction peak values, and inductor quality factor are the most important. The obtained results prove that each analysis type is not fully reliable without the other in determining the coatings’ effects on the SMC inductors’ performance. In the end, it is demonstrated that SMC inductances can be successfully applied in a particular frequency range. Full article
(This article belongs to the Special Issue Soft Magnetic Composite Materials and Alloys)
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15 pages, 5972 KiB  
Article
Rapid Characterization Method for SMC Materials for a Preliminary Selection
by Emir Pošković, Fausto Franchini, Luca Ferraris, Federico Carosio and Marco Actis Grande
Appl. Sci. 2021, 11(24), 12133; https://0-doi-org.brum.beds.ac.uk/10.3390/app112412133 - 20 Dec 2021
Cited by 16 | Viewed by 1943
Abstract
In electrical machines, laminated steels are commonly adopted as soft magnetic materials, while for permanent magnets, sintered ferrites and NdFeB are the most common solutions. On the other hand, the growing demand for volume reduction with the increment of efficiency leads to the [...] Read more.
In electrical machines, laminated steels are commonly adopted as soft magnetic materials, while for permanent magnets, sintered ferrites and NdFeB are the most common solutions. On the other hand, the growing demand for volume reduction with the increment of efficiency leads to the necessity of exploring other magnetic materials able to face the challenge better than the traditional ones. Bonded magnets have been used to replace sintered magnets, obtaining a better use of space and particular magnetic properties. Instead, for the magnetic circuit, Soft Magnetic Composites (SMC) allow realizing very complex magnetic design (3D path for flux) with iron loss reduction at medium-high frequencies, especially for the eddy currents loss contribution. On the other hand, SMC materials have such drawbacks as low mechanical properties and high hysteresis losses. For this reason, in this work, different studies considering several variables have been carried out. SMCs were produced through a moulding process; inorganic and organic layers to cover ferromagnetic particles were used, adopting different coating processes. Particular tests have been performed for a quicker and more indicative overview of the materials obtained. The single sheet tester (SST) is easier than traditional toroidal methods; on the other hand, the multiplicity of variables affects the SMC materials and their process. For this reason, coercivity and conductibility tests permit rapid measurement and provide a direct classification of the produced SMCs, providing the main information needed to select suitable materials. Results highlighted that choosing the more appropriate SMC material is possible after using these simple preliminary tests. After these tests, it was possible to argue that with 0.2 wt% of phenolic resin as the organic layer (and compaction pressure of 800 MPa), it is possible to produce a good SMC. On the other hand, the SMC with 0.2 wt% of epoxy resin (and compaction pressure of 800 MPa) gives a minor coercivity value. Additionally, despite the SMC with the inorganic layer, 0.2 wt% of nano-ferrites showing the best coercivity values (specifically for vacuum treatment at 600 °C), their resistivity was unsatisfactory. Full article
(This article belongs to the Special Issue Soft Magnetic Composite Materials and Alloys)
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