Electroless coating of Permalloy powder and DC-resistivity of alloy composites

Ozols, A.; Pagnola, Marcelo Rubén; García, David; Sirkin, H.

doi:10.1016/j.surfcoat.2005.10.028

Cited by 16 publications

(6 citation statements)

References 14 publications

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“…In the further development of electrical and electronic devices, magnetic devices (inductor, power converters, etc.) are required to develop in the direction of miniaturization and high efficiency [ 2 , 3 , 4 , 5 ]. In the past, soft magnetic materials do not need to operate at higher frequencies due to the low operating frequency of power semiconductors.…”

Section: Introductionmentioning

confidence: 99%

A Study on an Easy-Plane FeSi3.5 Composite with High Permeability and Ultra-Low Loss at the MHz Frequency Band

Yang

Huang

et al. 2023

Materials

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An easy-plane FeSi3.5 composite with excellent magnetic properties and loss properties at MHz were proposed. The easy-plane FeSi3.5 composite has ultra-low loss at 10 MHz and 4 mT, about 372.88 kW/m3. In order to explore the reason that the Pcv of easy-plane FeSi3.5 composite is ultra-low, a none easy-plane FeSi3.5 composite, without easy-plane processing as a control group, measured the microstructure, and the magnetic and loss properties. We first found that the real reason why magnetic materials do not work properly at MHz due to overheat is dramatical increase of the excess loss and the easy-plane composite can greatly re-duce the excess loss by loss measurement and separation. The total loss of none easy-plane FeSi3.5 composite is much higher than that of easy-plane FeSi3.5 composite, where the excess loss is a major part in the total loss and even over 80% in the none easy-plane FeSi3.5 composite. The easy-plane FeSi3.5 composite can greatly reduce the total loss compared to the none easy-plane FeSi3.5 composite, from 2785.8 kW/m3 to 500.42 kW/m3 (3 MHz, 8 mT), with the main reduction being the excess loss, from 2435.2 kW/m3 to 204.93 kW/m3 (3 MHz, 8 mT), reduced by 91.58%. Furthermore, the easy-plane FeSi3.5 composite also has excellent magnetic properties, high permeability and ferromagnetic resonance frequencies. This makes the easy-plane FeSi3.5 composite become an excellent soft magnetic composite and it is possible for magnetic devices to operate properly at higher frequencies, especially at the MHz band and above.

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Section: Introductionmentioning

confidence: 99%

A Study on an Easy-Plane FeSi3.5 Composite with High Permeability and Ultra-Low Loss at the MHz Frequency Band

Yang

Huang

et al. 2023

Materials

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“…They consist of ferromagnetic powder particles initially surrounded by an electrically insulating film [1,2]. These materials have unique properties such as 3D isotropic ferromagnetic behavior, very low eddy current loss, a relatively low total core loss at medium and high frequencies, flexible machine design and a prospect for greatly reduced weight and production costs in comparison with laminated steels [3][4][5][6][7]. SMCs are produced by compacting of insulated ferromagnetic powders such as high purity iron particles.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Electrical Properties of Iron-Based Soft Magnetic Composites with Silicone Resin Insulation Coating

Liu

et al. 2016

KEM

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This paper investigates the magnetic and electrical properties of iron silicone resin soft magnetic composites. Scanning electron microscopy, energy dispersive X-ray spectroscopy analysis, distribution maps and density measurements confirm that the particles surface layer contains a thin layer of silicone resin with complete coverage of powders surface. The thickness of silicone resin film is averagely 120nm according to the results of transmission electron microscopy. Magnetic measurements show that the silicone resin insulation has a greater heat resistance than the conventional phosphate insulation, which enables stress reliving during annealing at higher temperature (600°C) without a large increase in magnetic loss. The results of annealing at 600°C show that the electrical resistivity increased from 8μΩ·m for SOMALOYTM samples to 55μΩ·m for the silicone insulated composites produced in this work.

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“…Zhou et al [6] studied the change law between temperature and electrical conductivity of Sn(Pb)Te-Bi 2 Te 3 compounds; they concluded that as the temperature goes up, the conductivity of the samples decreases rapidly, and its conductivity reaches the max under usual temperature. Ozols et al [7] studied electrical resistivity of SMC with different polymer contents and the SMC with permalloy powders uncoated or coated. Tang et al [8] investigated the temperature dependence on resistivity of La 1−x Sr x MnO 3 compounds.…”

Section: Introductionmentioning

confidence: 99%

Design and application of a small electrode experimental installation for resistivity measurement of mineral and solid insulating material

Luo

Guan

et al. 2011

Sci. China Technol. Sci.

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There has not been an effective method to measure the resistivity of small-size sample of mineral and solid insulating material until now. According to the Chinese National Standard (GB/T1410-2006) and features of digital high resistance meter, a small electrode experimental installation was developed; it can work with current high resistance meter; the sample decreases to 18 mm from standard size 100 mm in diameter and reduces by 30.86 times in area. A three-electrode system is supported and precisely positioned by two insulating bases whose diameter is 60 mm and height is 20 mm, which ensures accuracy of device structure and reliability of measuring results. The key technological parameters are as follows: diameter of high voltage electrode is 18mm; diameter of measuring electrode is 14.6 mm; internal diameter and external diameter of guard electrode are 16 and 18 mm, respectively; the gap between guard electrode and measuring electrode is set at 0.6 mm. These parameters are adequate for the measurement of flat specimen of mineral and solid insulating material whose diameter is 18 mm. According to the confirmatory experiment on the volume resistivity and surface resistivity, the measuring results are almost the same, using a small electrode experimental installation and a standard electrode. resistivity, insulating property, insulating material, mineral physics, material physics Citation:Wang L, Luo K, Li Z Q, et al. Design and application of a small electrode experimental installation for resistivity measurement of mineral and solid insulating material.

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Electroless coating of Permalloy powder and DC-resistivity of alloy composites

Cited by 16 publications

References 14 publications

A Study on an Easy-Plane FeSi3.5 Composite with High Permeability and Ultra-Low Loss at the MHz Frequency Band

A Study on an Easy-Plane FeSi3.5 Composite with High Permeability and Ultra-Low Loss at the MHz Frequency Band

Magnetic and Electrical Properties of Iron-Based Soft Magnetic Composites with Silicone Resin Insulation Coating

Design and application of a small electrode experimental installation for resistivity measurement of mineral and solid insulating material

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