Enhanced electromagnetic properties of Fe–Cr–Si alloy powders by sodium silicate treatment

Chen, Shih Fan; Chang, Hsuan Yao; Wang, Shea Jue; Chen, Shih-Hsun; Chen, Chien Chon

doi:10.1016/j.jallcom.2015.02.198

Cited by 17 publications

(3 citation statements)

References 13 publications

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“…Moreover, as was shown recently [6][7][8][9][10], the addition of silicon to Fe-Cr alloys greatly enhances their anti-corrosion properties since in the case of Fe-Cr-Si alloys in oxidizing conditions, the passive film composed of Cr 2 O 3 and SiO 2 oxides is formed. Despite their excellent corrosion resistance, Fe-Cr-Si alloys are also of great interest in the research of magnetics and being used as electromagnetic wave absorbers for mobile phones, local area networks and radars [11,12]. However, it should also be noted that high concentrations of chromium and silicon contents in iron may lead to a deterioration in the mechanical properties of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of Fe-Cr-Si Alloy Powders Prepared by Mechanical Alloying

Sobota,

Idczak,

Konieczny

et al. 2023

Coatings

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Powders with nanometric crystallites of two ternary alloys Fe0.90Cr0.05Si0.05 and Fe0.85Cr0.10Si0.05 were prepared by mechanical alloying (MA) in a planetary high-energy ball mill at various milling times followed by annealing in a vacuum at 900 K to induce an oxygen-induced surface segregation of Cr and Si atoms. The prepared powders were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The obtained results show that all prepared powders crystallize in the body-centered cubic structure and are composed of micrometric particles, which are polycrystalline and consist of many nanometric crystallites. The mean size of the particles as well as the crystallites decreases progressively with milling time. In order to study the anti-corrosion properties of the obtained materials, the powders were exposed to atmospheric gases at 870 K. After each oxidation step, the formation of iron oxides was investigated using 57Fe transmission Mössbauer spectroscopy (TMS). It was found that the powders of Fe0.90Cr0.05Si0.05 and Fe0.85Cr0.10Si0.05 obtained after 10 and 20 h of MA are extremely resistant to oxidation. This result can be connected with the fact that XPS measurements reveal a high concentration of Cr and Si atoms on the surface of powder particles.

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Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of Fe-Cr-Si Alloy Powders Prepared by Mechanical Alloying

Sobota,

Idczak,

Konieczny

et al. 2023

Coatings

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“…[ 7–10 ] Among the various alloys used in SMCs, a Fe–Si–Cr alloy has been widely used because it has high resistivity and insulation impedance characteristics, thus leading to relatively low core loss and high reliability at high powers. [ 11,12 ] With the increasing demand for high‐performance components, new magnetic materials are highly recommended to obtain low core loss at high frequency because this characteristic becomes critical. Even though Fe–Si–Cr alloys are popular for power inductors, these materials still suffer from core loss issues at high frequency.…”

Section: Introductionmentioning

confidence: 99%

Study on Surface Modification of Fe–Si–Cr Alloy by Selective Oxidation Heat Treatment and its Corrosion Properties

Park

Hwang

Seo

et al. 2022

steel research int.

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“…Fe-Si alloys with Al addition have been considered one of the most suitable materials for powder cores since the alloy with ordered phases shows the highest permeability [6], however the core loss of Fe-Si-Al increases linearly with temperature. Cr addition could improve the corrosion resistance and temperature stability of Fe-Si alloys [7], and enhances ductility for a better ball milling effect, but also increases the coercivity and reduces the high frequency magnetic performance. This paper focuses on the hyperfine structure and magnetic characteristics in Fe-Si-Cr alloys with increasing heat treatment temperature.…”

Section: Introductionmentioning

confidence: 99%