scholarly journals New Soft Magnetic Composites for electromagnetic applications with improved mechanical properties

AIP Advances ◽  
2016 ◽  
Vol 6 (5) ◽  
pp. 056209 ◽  
Author(s):  
Luca Ferraris ◽  
Emir Pošković ◽  
Fausto Franchini
Keyword(s):  
Mechanical Properties ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Soft Magnetic Composites

scholarly journals Recent Advances in Multi-Functional Coatings for Soft Magnetic Composites

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6844
Author(s):  
Emir Pošković ◽  
Fausto Franchini ◽  
Luca Ferraris ◽  
Elisa Fracchia ◽  
Jana Bidulska ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
State Of The Art ◽  
Inorganic Materials ◽  
Organic Layer ◽  
Soft Magnetic ◽  
Research Activity ◽  
Magnetic Composites ◽  
Recent Advances ◽  
Starting Point ◽  
Soft Magnetic Composites

During the past 50 years, the aim to reduce the eddy current losses in magnetic cores to a minimum led to the formulation of new materials starting from electrically insulated iron powders, today called Soft Magnetic Composites (SMC). Nowadays, this promising branch of materials is still held back by the mandatory tradeoff between energetic, electrical, magnetic, and mechanical performances. In most cases, the research activity focuses on the deposition of an insulating/binding layer, being one of the critical points in optimizing the final composite. This insulation usually is achieved by either inorganic or organic layer constituents. The main difference is the temperature limit since most inorganic materials typically withstand higher treatment temperatures. As a result, the literature shows many materials and process approaches, each one designed to meet a specific application. The present work summarizes the recent advances in state of the art, analyzing the relationship among material compositions and magnetic and mechanical properties. Each coating shows its own processing sets, which vary from simple mechanical mixing to advanced chemical methods to metallurgical treatments. From state of the art, Aluminum coatings are characterized by higher current losses and low mechanical properties. In contrast, higher mechanical properties are obtained by adopting Silicon coatings. The phosphates coatings show the best-balanced overall properties. Each coating type was thoroughly investigated and then compared with the literature background highlighting. The present paper thus represents a critical overview of the topic that could serve as a starting point for the design and development of new and high-performing coating solutions for SMCs. However, global research activity continuously refines the recipes, introducing new layer materials. The following steps and advances will determine whetherthese materials breakthrough in the market.

Magnetic and mechanical properties of Fe-based α-Fe2O3/nano-sized MgO-coated composites

2017 ◽  
Vol 233 (6) ◽  
pp. 1134-1144
Author(s):  
Ling Xiao ◽  
Hongwei Fan ◽  
Wenjie Cheng ◽  
Zigang Li ◽  
Ming Li
Keyword(s):  
Mechanical Properties ◽  
Iron Oxide ◽  
Sandwich Structure ◽  
Field Analysis ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Leading Role ◽  
Soft Magnetic Composites ◽  
Mixing Method ◽  
Stress Field Analysis

Fe-based α-Fe2O3/nano-sized MgO-coated soft magnetic composites were fabricated by powder metallurgy with 800 MPa pressure at room temperature, and then annealed at 400 ℃. A layer of iron oxide α-Fe2O3 was generated on the iron surface by passivation treatment. The processed iron powders were coated with nano-sized MgO by mixing method. The soft magnetic composites with sandwich structure (Fe + iron oxide + nano-sized MgO) resulted in an increased permeability at a higher frequency, and higher eddy current loss compared to that of the resin layer by the two-step annealing method, which indicates that the sandwich structure for the soft magnetic composites exhibited noticeably higher frequency stability. The relationship between compressed load and displacement for two kinds of soft magnetic composites implied that the density and stress release for iron play a leading role in the mechanical properties. The stress field analysis of the internal microstructure by finite element method shows that the cracks and pores are two important factors that affect the mechanical strength for the whole material.

Magnetic and Mechanical Properties of Iron-Based Soft Magnetic Composites Coated with Silane Synergized by Bi2O3

2021 ◽  
Vol 50 (4) ◽  
pp. 2425-2435
Author(s):  
Wangchang Li ◽  
Wanjia Li ◽  
Yao Ying ◽  
Jing Yu ◽  
Jingwu Zheng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Soft Magnetic Composites ◽  
Iron Based

Preparing Soft Magnetic Composites for Structural and Micromechanical Investigations

2017 ◽  
Vol 54 (6) ◽  
pp. 366-387
Author(s):  
T. Schwark ◽  
M. Müller ◽  
Y. Mine ◽  
T. Kreuter ◽  
O. Kraft ◽  
...  
Keyword(s):  
Soft Magnetic ◽  
Magnetic Composites ◽  
Soft Magnetic Composites
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