Improved Magnetic Properties of Silicon-Iron Alloy Powder Core

2007 ◽  
Vol 534-536 ◽  
pp. 1321-1324 ◽  
Author(s):  
Tae Kyung Lee ◽  
Gu Hyun Kim ◽  
Gwang Bo Choi ◽  
In Bum Jeong ◽  
Kwang Youn Kim ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Core Loss ◽  
Low Frequency ◽  
Iron Alloy ◽  
Size Control ◽  
Soft Magnetic Materials ◽  
Silicon Iron ◽  
Magnetic Components ◽  
Si Content ◽  
Size Adjustment

Eventhough Fe-6.5 wt.% Si alloy shows excellent magnetic properties, magnetic components made of the alloy with the composition are not totally commercialized because of its extremely low ductility. In order to overcome this demerit of alloy, 6.7 wt.% Si alloy powders were produced by gas atomization and then post-processed to form magnetic cores. By doing so, the total core loss could be minimized by reducing both hysteresis and eddy current loss, which were attributed to both grain size adjustment and particle size control. From our experiments, we were able to achive a core loss of 390 mW/cm3 at an induction of 0.1 T and 50 kHz through proper processes and a permeability μeff of 68 at low frequency was kept up to 700 kHz. These properties are compatable with the properties of well-known soft magnetic materials such as Fe-Si-Al and Ni- Fe alloys. From the above results, it can be concluded that Fe-Si alloy powders with high Si content have very high potential for the commercialization and application of the core.

Preparation and Magnetic Properties of Fe@SiO2 Soft Magnetic Composites

2020 ◽  
Vol 993 ◽  
pp. 638-645
Author(s):  
Shuai Feng ◽  
Yan An ◽  
Zong Xiang Wang ◽  
Kai Sun ◽  
Run Hua Fan
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Core Loss ◽  
Low Frequency ◽  
Magnetic Flux Density ◽  
Iron Particles ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Insulating Layer ◽  
Iron Powders

In this work, the insulating SiO2 was coated successfully on the surface of reduced iron particles by a sol-gel method to decrease the core loss at low frequency. The scanning electron microscope images and elements analysis confirm that the surface of iron powders particles were covered by a thin insulating layer in the form of uniform core-shell structure. The samples were annealed at 400 °C in N2 atmosphere to obtain better magnetic properties. The annealed SMCs with 10 mL/h dropping rate of TEOS have optimum magnetic properties with low core loss Ps of 280.89 W/kg and high saturation magnetic flux density Bs of 1.038 T at 1000 Hz.

scholarly journals Texture and Magnetic Properties

1981 ◽  
Vol 4 (3) ◽  
pp. 129-141 ◽  
Author(s):  
P. R. Morris ◽  
J. W. Flowers
Keyword(s):  
Experimental Data ◽  
Magnetic Properties ◽  
Magnetic Property ◽  
Property Values ◽  
Core Loss ◽  
Theoretical Development ◽  
Silicon Iron ◽  
Independent Components ◽  
Cubic Materials ◽  
Fourth Order Equations

Expressions are derived for the dependence of the magnetic properties of cubic materials on texture. The theoretical development generally parallels that of Bunge, but employs Roe's formalism. The expressions, together with limited experimental data, enable one to express magnetic property variations in the plane of the sheet, to obtain property values for comparable texture-free specimens, and to separate magnetic properties into texture-dependent and texture-independent components. Core loss, magnetic permeability and torque or specimens of "nonoriented" nominal 3% silicon-iron are fitted to simple fourth-order equations.

Prediction of the Energy Losses in Soft Magnetic Alloys Based on the Magnetic Objects Theory in the Case of the Uniform Magnetic Flux Penetration

2014 ◽  
Vol 792 ◽  
pp. 260-265
Author(s):  
Veronica Paltanea ◽  
Gheorghe Paltanea ◽  
Horia Gavrila
Keyword(s):  
Amorphous Ribbon ◽  
Rolling Direction ◽  
Low Frequency ◽  
Soft Magnetic Materials ◽  
Magnetic Polarization ◽  
Soft Magnetic ◽  
Silicon Iron ◽  
Soft Magnetic Alloys ◽  
Loss Prediction ◽  
Theoretical Assessment

We report an investigation and a theoretical assessment of energy loss prediction in crystalline and amorphous soft magnetic materials. There were tested a sample made from non-oriented silicon iron (NO FeSi) M800-65A, industrial type alloy, cut longitudinally to the rolling direction and a toroidal sample of Co67Fe4B14.5Si14.5amorphous ribbon. The losses behaviour of the crystalline NO FeSi strip was studied as function of frequency in the range of 5 Hz to 200 Hz at a given magnetic polarization (Jp) of 0.5 T and 1 T. In the case of the amorphous Co-based ribbon the losses variation was studied as function of frequency in the range of 5 Hz to 10 kHz at a given magnetic polarization of 20 mT. Using the concept of loss separation for the data analysis, in the approximation of linear magnetization law and low frequency limit, it can be considered in both cases, that the excess losses can be quantitatively assessed within the theoretical framework of the statistical loss model based on magnetic object theory.

Texture Development during Final Annealing in Nonoriented Electrical Steels

2005 ◽  
Vol 495-497 ◽  
pp. 471-476 ◽  
Author(s):  
Jong Tae Park ◽  
Jerzy A. Szpunar ◽  
Jae Kwan Kim
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Grain Growth ◽  
Recrystallization Texture ◽  
Core Loss ◽  
Size Control ◽  
Final Annealing ◽  
Electrical Steels ◽  
Texture Change ◽  
Grain Size Control

Nonoriented electrical steels have been widely used as core materials in motors and generators. For these applications low core loss and high permeability are required. The magnetic properties of these steels depend on the grain size and crystallographic texture of the annealed final products. The problems related to grain size control have been extensively investigated, while texture control has received much less attention. The technologies used to control the grain size in nonoriented electrical steels have approached to their limits. However, there is still some possibility for improvement of the magnetic properties through texture control. In order to explore this possibility, the evolution of recrystallization texture for nonoriented electrical steels with 2% Si was systematically studied. Texture change during grain growth was additionally analyzed. The formation of recrystallization texture is explained by oriented nucleation. This is supported by the fact that the area fraction of nuclei or recrystallized grains with specific orientation to all new grains remains almost constant during the progress of recrystallization. Most nuclei have a high misorientation angle of 25~55° with the surrounding deformed matrices. During the progress of grain growth, Goss and {111}<112> components are weakened and the random texture is strengthened. The grains of the Goss and {111}<112> orientations have smaller grain size than those of random orientation.

MAGNESIL-O

Alloy Digest ◽  
1975 ◽  
Vol 24 (9) ◽  
Keyword(s):  
Magnetic Properties ◽  
Shear Strength ◽  
Magnetic Flux ◽  
Physical Properties ◽  
Tensile Properties ◽  
Iron Alloy ◽  
Heat Treating ◽  
Silicon Iron ◽  
Strip Length

Abstract MAGNESIL-O is an oriented silicon-iron alloy of exceptional magnetic qualities designed for applications involving frequencies of 400 Hertz and higher. It has pronounced directional magnetic properties in the direction of rolling. It is recommended for wound cores and stacked laminations which are sheared so that the magnetic flux is mainly in the direction of the strip length. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength. It also includes information on forming and heat treating. Filing Code: Fe-54. Producer or source: Spang Industries Inc..

Metallography Parameters Study of Fe-6.5wtSi Alloy Obtained by Spray Forming

2008 ◽  
Vol 591-593 ◽  
pp. 315-321
Author(s):  
F.L. Rodrigues ◽  
M.A. Soares ◽  
Maria do Carmo Silva ◽  
Claudemiro Bolfarini ◽  
M.D.C. Sobral
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Silicon Content ◽  
Room Temperature ◽  
Core Loss ◽  
Polarized Light ◽  
Spray Forming ◽  
Dark Field ◽  
Bright Field ◽  
Silicon Iron

Silicon-iron alloys with silicon content about 6.5wt.%Si offer a great potential for applications aiming reduction of core loss in electric parts. Deposits of the Fe-6.5wt%Si alloy produced by spray forming were annealed at temperatures between 400 and 1300oC, during 1h in vacuum. The grain size has a great importance to the magnetic properties. In the present work, it was analyzed the influence of the metallography parameters in order to get the best accuracy to determine the grain size according to ASTM 112-96. Chemical composition, time and temperature of specific etchings were modified and tested in different conditions of observation in light microscopy. Bright field, polarized light and dark field were used in the samples aiming to measure the grain size. The best etchings were Nital 10% and Marshall, both at room temperature. The results of grain measurement are presented in their relationship with the magnetic properties.

Improved Magnetic Properties of Silicon-Iron Alloy Powder Core

2007 ◽  
pp. 1321-1324
Author(s):  
Tae Kyung Lee ◽  
Gu Hyun Kim ◽  
Gwang Bo Choi ◽  
In Bum Jeong ◽  
Kwang Youn Kim ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Alloy Powder ◽  
Iron Alloy ◽  
Silicon Iron

Energy Loss Analysis and Magnetic Properties of Non-Oriented Electrical Steel Cut through Different Technologies

2015 ◽  
Vol 1105 ◽  
pp. 83-87 ◽  
Author(s):  
Veronica Manescu Paltanea ◽  
Gheorghe Paltanea ◽  
Horia Gavrila
Keyword(s):  
Magnetic Properties ◽  
Electrical Steel ◽  
Soft Magnetic Materials ◽  
Magnetic Polarization ◽  
Soft Magnetic ◽  
Silicon Iron ◽  
Loss Analysis ◽  
Magnetic Circuits ◽  
Materials Used ◽  
Single Strip

Non-oriented silicon iron (NO Fe-Si) alloys are soft magnetic materials used in the construction of medium and high power rotating machines. To obtain efficiency higher than 95%, it is necessary to promote a new design of their magnetic circuits and/or alternative cutting technologies. There were tested steel samples of fully processed non-oriented silicon iron (NO FeSi) grades, M400-65A and M800-65A, with an area of 300 × 30 mm2. The magnetic properties were measured with a single strip tester in the range of frequency from 10 ÷ 200 Hz at 1 T peak magnetic polarization. The sheet cutting technologies, involved in this study, are mechanical, laser, water-jetting and electro-erosion.

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