Fabrication and properties of iron-based soft magnetic composites coated with parylene via chemical vapor deposition polymerization

Wu, Shen; Sun, Aizhi; Lu, Zhenwen; Cheng, Chuan Bing

doi:10.1016/j.matchemphys.2015.01.026

Cited by 35 publications

(9 citation statements)

References 17 publications

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“…The secondary images also exhibit that by increasing the borosilicate content the amount of porosities enhances, the compaction becomes more difficult and thus the density decreases. It should be mentioned that the similar microstructures have been observed by the other researchers on iron powders coated by silicone [9] and epoxy resin [12]. the compaction pressure results in the plastic deformation of iron particles and consequently, the elimination of porosities and gaps.…”

Section: -1-the Compaction By Uniaxial Pressing Technique 3-1-1-the supporting

confidence: 77%

“…In the recent years, different materials were utilized as a coating around iron powders such as phenolic resin [6,7], Amorphous Vitroperm (Fe 73 Cu 1 Nb 3 Si 16 B 7 ) alloy [8], silicone [9], phenolformaldehyde resin [10], Al 2 O 3 [11], Parylenes [12], Mn-Zn ferrite [13], Ni-Zn ferrite [14][15][16], and SiO 2 [17]. Although, the application of organic coatings lowers the processing temperature during warm compaction [2] it could also lowers the working temperature of composite.…”

Section: -Introductionmentioning

confidence: 99%

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Iron-borosilicate soft magnetic composites: The correlation between processing parameters and magnetic properties for high frequency applications

Gheiratmand

Hosseini

Reihani

2017

Journal of Magnetism and Magnetic Materials

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Iron-borosilicate soft magnetic composites are suitable magnetic materials for high temperature and high frequency applications. In this research two different techniques have been applied to fabricate these composites: uniaxial pressing following by sintering and spark plasma sintering. Different processing parameters including the content of borosilicate, the amount of compaction pressure and the size of iron particles have been evaluated through the study of microstructure and magnetic properties. The microstructural observations showed that the borosilicate is distributed on the iron grain boundaries enhancing the resistivity and causing the loss of eddy currents. Increasing the compaction pressure was led to the decrease of electrical resistivity. By increasing the frequency both real and imaginary parts of permeability decreased. The use of higher content of borosilicate resulted in the lower decreasing slop of permeability. Best combination of density, permeability and electrical resistivity was obtained in the sample with 2 wt% of borosilicate. In addition, the densification of powders with fine particles was more difficult than coarse particles due to the inter particles friction and bridging effects. Furthermore, as the particles size increases the size of open porosities before sintering where the borosilicate could aggregate enhances. This could yields to the increase in the electrical resistivity. The high ratio of surface to the volume in the powders with fine particles results in the developing the demagnetizing fields and subsequently, decreasing the permeability. The highest relative density (99.99 % of theoretical density) with best distribution of borosilicate was achieved in the composites produced by spark plasma sintering (SPS). The relaxation frequency, obtained from imaginary part of permeability, was found as 340 Hz in the composites made by SPS.

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Section: -1-the Compaction By Uniaxial Pressing Technique 3-1-1-the supporting

confidence: 77%

Section: -Introductionmentioning

confidence: 99%

Iron-borosilicate soft magnetic composites: The correlation between processing parameters and magnetic properties for high frequency applications

Gheiratmand

Hosseini

Reihani

2017

Journal of Magnetism and Magnetic Materials

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“…Generally, the insulating materials are divided into organic and inorganic materials. Organic materials such as epoxy resin [10], parylene [11], and phenolic resin [12] exhibit a satisfactory performance in increasing the resistivity of iron powders, but their application under high temperatures is limited due to the nature of high polymer materials. Inorganic coating can therefore be a better choice, since, if the proper amount of coating material is applied, they have high thermal stability and improved soft magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Soft Magnetic Properties of Iron-Based Powder Cores with Co-Existence of Fe3O4–MnZnFe2O4 Nanoparticles

Xie

Yan

2018

Metals

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An iron-based soft magnetic composite with Fe 3 O 4 -MnZnFe 2 O 4 insulation coating has been prepared by powder metallurgy method. This work investigated the microstructure and magnetic properties of Fe/Fe 3 O 4 -MnZnFe 2 O 4 powder cores. Scanning electron microscopy (SEM) coupled with an energy dispersive spectrometry (EDS) analysis indicated that the Fe 3 O 4 and MnZnFe 2 O 4 nanoparticles were uniformly coated on the surface of Fe powders. The co-existence of Fe 3 O 4 and MnZnFe 2 O 4 contributes to the preferable distribution of nano-sized insulation powders and excellent soft magnetic properties of soft magnetic composite (SMC) with high saturation magnetization M s (215 A·m 2 /kg), low core loss (178.7 W/kg measured at 100 kHz, 50 mT), and high effective amplitude permeability of 114 (measured at 100 kHz). Overall, this work has great potential for realizing low core loss and outstanding soft magnetic properties of Fe-based powder cores.

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“…Many attempts have been made to select insulating coating materials, which are mainly categorized as organic or inorganic. Polyimide, phenol, epoxy, parylene, silicone, and acrylic resins have been used as organic coating materials for SMPCs and amorphous ribbons [8][9][10][11][12][13][14][15][16][17][18][19]. The advantage of organic coatings is their good coating integrity, but their heat-resistant temperatures are limited, generally less than 500 • C. Amorphous ribbons require polymers with multiple functional properties such as high insulation, corrosion Polymers 2021, 13, 1350 2 of 10 resistance, increased sensitivity, and high-temperature resistance.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Magnetic Properties of FeSiAl Soft Magnetic Composites Prepared by Utilizing PSA as Resin Insulating Layer

et al. 2021

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Thermosetting organic resins are widely applied as insulating coatings for soft magnetic powder cores (SMPCs) because of their high electrical resistivity. However, their poor thermal stability and thermal decomposition lead to a decrease in electrical resistivity, thus limiting the annealing temperature of SMPCs. The large amount of internal stress generated by soft magnetic composites during pressing must be mitigated at high temperatures; therefore, it is especially important to find organic resins with excellent thermal stabilities. In this study, we prepared SMPCs using poly-silicon-containing arylacetylene resin, an organic resin resistant to high temperatures, as an insulating layer. With 2 wt % PSA as an insulating layer and annealed at 700 °C for 1 h, the FeSiAl SMPCs achieved the best magnetic properties, including the lowest core loss of 184 mW/cm3 (measured at 0.1 T and 50 kHz) and highest permeability of 96.

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Fabrication and properties of iron-based soft magnetic composites coated with parylene via chemical vapor deposition polymerization

Cited by 35 publications

References 17 publications

Iron-borosilicate soft magnetic composites: The correlation between processing parameters and magnetic properties for high frequency applications

Iron-borosilicate soft magnetic composites: The correlation between processing parameters and magnetic properties for high frequency applications

Enhanced Soft Magnetic Properties of Iron-Based Powder Cores with Co-Existence of Fe3O4–MnZnFe2O4 Nanoparticles

Enhanced Magnetic Properties of FeSiAl Soft Magnetic Composites Prepared by Utilizing PSA as Resin Insulating Layer

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