scholarly journals Enhanced Permeability of Fe-Based Amorphous Powder Cores Realized through Selective Incorporation of Carbonyl Iron Powders at Inter-Particle Voids

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1220
Author(s):  
Hea-Ran Kim ◽  
Min-Sun Jang ◽  
Yeong-Gyun Nam ◽  
Yun-Seok Kim ◽  
Sang-Sun Yang ◽  
...  

In this study, we demonstrate a hybrid multimodal soft magnetic composite (SMC) comprising gas-atomized spherical amorphous powder (AP) and carbonyl-iron powder (CIP), and present its enhanced electromagnetic properties. CIP is selectively incorporated into voids between AP, and deforms during compression, effectively reducing the pores, resulting in high packing density of the core, where CIP magnetically bridges AP and helps magnetic domain rotation much efficiently. The hybrid SMC with the addition of 20 wt.% CIP showed constant effective permeability of 57 up to 1 MHz, a remarkable 63% increase compared with the AP core, while DC bias superimposing retention level of 61% was secured with the help of high magnetization of CIP. In addition, the effect of SiO2 surface insulation, prepared by the sol-gel process, on the high-frequency magnetic properties of hybrid SMCs, was also evaluated. It is thus revealed that the high-frequency dynamic loss of the hybrid core, originating from intra-particle eddy current loss and anomalous loss component, and inter-particle eddy currents are negligibly small. We believe that our approach using AP/CIP multimodal hybrid SMCs is an effective way of achieving high permeability as well as high DC bias characteristics at high frequencies. This process will be highly beneficial for the miniaturization of power inductors.

2013 ◽  
Vol 96 (9) ◽  
pp. 46-52
Author(s):  
Masahito Koeda ◽  
Akihiro Harada ◽  
Hiroyuki Ono ◽  
Tomokazu Ishikura ◽  
Tomofumi Kuroda ◽  
...  

2011 ◽  
Vol 295-297 ◽  
pp. 93-97 ◽  
Author(s):  
Qian Zhang ◽  
Jun Yan ◽  
Tian Peng Li ◽  
Jing Wang

In order to transform the diamagnetism of expanded graphite (EG) to ferrimagnetism and improve its electromagnetic interferential capability, nano γ-Fe2O3/EG magnetic composite materials was prepared by sol-gel and low temperature self-combustion technique. The as prepared samples were characterized by SEM, XRD and Magnetic hysteresis cycle test. The results indicated that the composite materials had ferrimagnetism property after the embedding of γ-Fe2O3, but the average conductivity of the composites decreases gradually with the increase of γ-Fe2O3. Different mixing ratio of ferrite gel and graphite intercalation compounds produced ferric oxide with different crystal form and shape. When the content of ferrite sol was low, spherical γ-Fe2O3with the mean size of 31.69nm was formed, and spread unevenly on the surface and interformational micelles of EG. High content of ferrite sol (83wt%) produced more perfect crystal γ-Fe2O3of pentahedron shape with the mean size of 44.68nm, and a few of α-Fe2O3occurred which lead to the decline of the magnetic property of the composite materials.


Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4400
Author(s):  
Luca Ferraris ◽  
Fausto Franchini ◽  
Emir Pošković ◽  
Marco Actis Grande ◽  
Róbert Bidulský

In recent years, innovative magnetic materials have been introduced in the field of electrical machines. In the ambit of soft magnetic materials, laminated steels guarantee good robustness and high magnetic performance but, in some high-frequency applications, can be replaced by Soft Magnetic Composite (SMC) materials. SMC materials allow us to reduce the eddy currents and to design innovative 3D magnetic circuits. In general, SMCs are characterized at room temperature, but as electrical machines operate at high temperature (around 100 °C), an investigation analysis of the temperature effect has been carried out on these materials; in particular, three SMC samples with different binder percentages and process parameters have been considered for magnetic and energetic characterization.


2015 ◽  
Vol 226 ◽  
pp. 224-230 ◽  
Author(s):  
P. Małecki ◽  
K. Kolman ◽  
J. Pigłowski ◽  
J. Kaleta ◽  
J. Krzak

1999 ◽  
Vol 255 (2-3) ◽  
pp. 178-184 ◽  
Author(s):  
Sei-ichi Suda ◽  
Toshiya Tashiro ◽  
Takao Umegaki

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