Influence of Fabrication Process on Magnetic Properties of Co-Finemet Nanocrystalline Powder Core

2011 ◽  
Vol 399-401 ◽  
pp. 1008-1011
Author(s):  
Zhen Wang ◽  
Jing Liu ◽  
Ru Wu Wang ◽  
Jia Kun Min ◽  
Zhi Hong Lu ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Quality Factor ◽  
Effective Permeability ◽  
Nanocrystalline Powder ◽  
Negative Effect ◽  
Cold Pressed ◽  
Quality Factor Q ◽  
Size Powder ◽  
Excessive Stress

Abstract. Rapidly quenched ribbons of Fe63.5Co10Si13.5B9Cu1Nb3alloy were annealed at 550°C in a vacuum for 1h and milled to powders. Cold-pressed nanocrystalline powder cores were fabricated using 1-5wt.% of epoxy E-44 as the binder and 1wt.% of Zn-stearate for lubrication under the pressure 155-200KN. The microstructure and morphology of powders were characterized with XRD and SEM. The effective permeability (μe) and quality factor (Q) were tested by using LCR HiTESTER 3532-50 in the range of 1–5000 kHz. The results show that the μe of the powder cores increased with the particle size. Powder cores with 2wt.% binder exhibited higher μe, but lower Q compared with samples with 3wt.% binder. Increase of the forming pressure helps improve μe, but the excessive stress caused by the forming pressure had a negative effect for μe.

Effect of Annealing Temperature on the Soft Magnetic Behavior of Sendust Powder Core

2014 ◽  
Vol 556-562 ◽  
pp. 6-10 ◽  
Author(s):  
Ding Wei ◽  
Xian Wang ◽  
Ze Kun Feng ◽  
Rong Zhou Gong
Keyword(s):  
Quality Factor ◽  
Effective Permeability ◽  
Annealing Temperature ◽  
Inorganic Salt ◽  
Magnetic Behavior ◽  
Soft Magnetic ◽  
High Quality ◽  
Insulating Layer ◽  
Al Powder ◽  
Quality Factor Q

The variation of soft magnetic properties of Sendust powder cores as a function of annealing temperature has been investigated. Toroid-shaped Sendust powder cores were prepared from Fe-Si-Al powder by machine pulverizing and subsequent cold pressing using inorganic insulating layer and organic binders, respectively. The influence of different compaction pressures and various annealing temperature on effective permeability and quality factor was investigated. Sendust powder cores using inorganic salt as insulating layer exhibit high effective permeability ( μe>110) up to 1 MHz, showing excellent frequency stable characteristics and high quality factor (Q>80) at 50 kHz. The optimized annealing temperature is 953K.

scholarly journals Strategy to Enhance Magnetic Properties of Fe78Si9B13 Amorphous Powder Cores in the Industrial Condition

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 381 ◽  
Author(s):  
Haibo Sun ◽  
Ce Wang ◽  
Weihong Chen ◽  
Jiexin Lin
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Effective Permeability ◽  
Industrial Condition ◽  
Collaborative Optimization ◽  
Molding Pressure ◽  
Process Conditions ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Coating Agent

In this study, the soft magnetic properties of Fe78Si9B13 amorphous magnetic powder cores (AMPCs) were enhanced by coordinately adjusting the technological parameters, including the particle size distribution, molding pressure, and coating agent content, in the industrial condition. The results show that the optimized comprehensive soft magnetic properties of the Fe78Si9B13 AMPCs could be obtained under the following process conditions: (1) the distribution of particle size is 20 wt.% for 140–170 mesh, 70 wt.% for 170–270 mesh, and 10 wt.% for 270–400 mesh; (2) the molding pressure is in the range of 2.35–2.45 GPa; and (3) the additive amount of sodium silicate is 1.5 wt.%. After the collaborative optimization, the AMPCs’ compact density, ρ, the effective permeability, μe, and the residual effective permeability at the applied magnetizing field of 7.96 kA/m, μ[email protected] kA/m, increased from 5.61 g/cm3 to 5.86 g/cm3, from 58.13 to 77.01, and from 40.36 to 49.57, respectively. The attenuation ratio of the effective permeability, when in the frequency band of 20–100 kHz, was less than 0.85%. The core loss at the 50 kHz for the maximum magnetic flux density of 0.1 T reduced from 380.85 mW/cm3 to 335.23 mW/cm3. This work will encourage the further application of Fe-based AMPCs in the fields of electronics and telecommunication.

Characteristics of Fe-Si-B-Cr-C Powders Synthesized by the Spinning Water Atomization Process (SWAP) and its Application in Magnetic Core

2015 ◽  
Vol 749 ◽  
pp. 101-105
Author(s):  
Shih Fan Chen ◽  
Shih Hang Huang ◽  
Shea Jue Wang ◽  
Jin Shyong Lin ◽  
Shih Hsun Chen ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Saturation Magnetization ◽  
Quality Factor ◽  
Magnetic Core ◽  
Atomization Process ◽  
Magnetic Cores ◽  
Water Atomization ◽  
Quality Factor Q ◽  
Maximum Permeability

The application properties of magnetic cores made of Fe72.8Si11.2B10.8Cr2.3C2.9 powders was studied. The amorphous Fe72.8Si11.2B10.8Cr2.3C2.9 powders were prepared by a spinning water atomization process (SWAP), and the cores further were fabricated from those powders by a hydraulicpressing process. The particle size distribution of powders was about 10 to 20 μmand the alloy powders would crystallize during milling. For the cores, the maximum permeability μi was 14 and quality factor Q was 84 between 100kHz - 2000kHz for 1 wt.% Na2SiO4solidified with H-epoxy at 300°C. The minimum coercivityHcwas 0.22 Oe at 1 wt.% Na2SiO4 with PVB consolidated at 150 °C, and the maximum saturation magnetization Bm was 7.64×102 G for 2 wt.% Na2SiO4 with H-epoxy at 300 °C.

Influence of Compaction Pressure on Magnetic Properties of Sendust Powder Core

2016 ◽  
Vol 852 ◽  
pp. 79-83
Author(s):  
Ru Wu Wang ◽  
Feng Quan Zhang ◽  
Ding Wei ◽  
Ze Min Fang ◽  
Chun Zeng ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Alloy Powder ◽  
Power Loss ◽  
Effective Permeability ◽  
Annealing Temperature ◽  
Compaction Pressure ◽  
Magnetic Powder ◽  
Soft Magnetic ◽  
Dc Bias ◽  
Quality Factor Q

Toroid-shaped soft magnetic powder cores (SMCs) were produced by cold pressing of the commercial sendust alloy powders. The characteristics of the commercial sendust alloy powder and the effect of compaction pressure on the magnetic properties, i.e., effective permeability μe, quality factor Q, DC-bias properties and volume power loss of sendust alloy powder cores were investigated. The results showed that the sendust alloy powder core with shaping pressure of 1932 MPa, annealing temperature of 953 K for 1 h and dielectric content of 0.96% presents the optimum magnetic properties with an effective permeability of 90, a total loss of 386 mW/cm3 at f=50 kHz and Bm=0.1 T, a DC-bias property of 64% at H=50 Oe.

Processing Sm-Fe(Ta)-N hard magnetic materials

1999 ◽  
Vol 577 ◽  
Author(s):  
K Žužek ◽  
PJ Mcguiness ◽  
S Kobe
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Permanent Magnets ◽  
Processing Parameters ◽  
High Energy ◽  
Small Particle Size ◽  
Optimum Conditions ◽  
Hard Magnetic Materials ◽  
Negative Effect ◽  
Cast Alloys

ABSTRACTSmFe based alloys interstitially modified with nitrogen are potential candidates for high energy permanent magnets. In order to obtain the optimum properties a thorough understanding of the starting material and processing parameters is required. The microstructures of two cast alloys of composition Sm13.8Fe82.2 Ta4.0 and Sm13.7 Fe86.3 were carefully examined with a SEM equipped with EDX and the exact stoichiometries of the phases were determined. The SmFeTa material was found to contain significant amounts of TaFe2as well as the Sm2Fe17, SmFe2, SmFe3 phases observed in the SmFe material but without the a-iron dendrites which are characteristic of the latter material. The optimum conditions necessary to provide the highest coercivities using the conventional HDDR process, and for the HDDR process combined with pre-milling were investigated. The coercivities obtained after using the HDDR process and subsequent nitriding were 680 kA/m for the SmFeTaN and 360 kA/m for the SmFeN samples. Significantly higher coercivites of 1000 kA/m for SmFeN and 1275 kA/m for SmFeTaN were achieved by reducing the particle size with milling prior to the HDDR process.The better coercivities obtained with the Ta containing sample were found to be due to the presence of a much smaller amount of a. The milling prior to the HDDR treatment improves the magnetic properties because of the small particle size which prevents the grains growing too large, with their consequent very negative effect on the coercivity.

NÉEL LINES STRUCTURES IN UNIAXIAL FERROMAGNETS WITH QUALITY FACTOR Q > 1

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1947-C8-1948
Author(s):  
J. Miltat ◽  
P. Trouilloud
Keyword(s):  
Quality Factor ◽  
Quality Factor Q

scholarly journals Impact of Iron on the Fe–Co–Ni Ternary Nanocomposites Structural and Magnetic Features Obtained via Chemical Precipitation Followed by Reduction Process for Various Magnetically Coupled Devices Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 341
Author(s):  
Tien Hiep Nguyen ◽  
Gopalu Karunakaran ◽  
Yu.V. Konyukhov ◽  
Nguyen Van Minh ◽  
D.Yu. Karpenkov ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Reduction Process ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
Magnetic Characteristics ◽  
Reduction Temperature ◽  
Fe Content ◽  
Magnetic Features ◽  
Co Precipitation

This paper presents the synthesis of Fe–Co–Ni nanocomposites by chemical precipitation, followed by a reduction process. It was found that the influence of the chemical composition and reduction temperature greatly alters the phase formation, its structures, particle size distribution, and magnetic properties of Fe–Co–Ni nanocomposites. The initial hydroxides of Fe–Co–Ni combinations were prepared by the co-precipitation method from nitrate precursors and precipitated using alkali. The reduction process was carried out by hydrogen in the temperature range of 300–500 °C under isothermal conditions. The nanocomposites had metallic and intermetallic phases with different lattice parameter values due to the increase in Fe content. In this paper, we showed that the values of the magnetic parameters of nanocomposites can be controlled in the ranges of MS = 7.6–192.5 Am2/kg, Mr = 0.4–39.7 Am2/kg, Mr/Ms = 0.02–0.32, and HcM = 4.72–60.68 kA/m by regulating the composition and reduction temperature of the Fe–Co–Ni composites. Due to the reduction process, drastic variations in the magnetic features result from the intermetallic and metallic face formation. The variation in magnetic characteristics is guided by the reduction degree, particle size growth, and crystallinity enhancement. Moreover, the reduction of the surface spins fraction of the nanocomposites under their growth induced an increase in the saturation magnetization. This is the first report where the influence of Fe content on the Fe–Co–Ni ternary system phase content and magnetic properties was evaluated. The Fe–Co–Ni ternary nanocomposites obtained by co-precipitation, followed by the hydrogen reduction led to the formation of better magnetic materials for various magnetically coupled device applications.

scholarly journals 422 Million intrinsic quality factor planar integrated all-waveguide resonator with sub-MHz linewidth

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Matthew W. Puckett ◽  
Kaikai Liu ◽  
Nitesh Chauhan ◽  
Qiancheng Zhao ◽  
Naijun Jin ◽  
...  
Keyword(s):  
Quality Factor ◽  
High Capacity ◽  
Precision Spectroscopy ◽  
Narrow Linewidth ◽  
Waveguide Resonator ◽  
Environmental Disturbances ◽  
Fiber Communications ◽  
Intrinsic Quality ◽  
Quality Factor Q ◽  
Quantum Photonics

AbstractHigh quality-factor (Q) optical resonators are a key component for ultra-narrow linewidth lasers, frequency stabilization, precision spectroscopy and quantum applications. Integration in a photonic waveguide platform is key to reducing cost, size, power and sensitivity to environmental disturbances. However, to date, the Q of all-waveguide resonators has been relegated to below 260 Million. Here, we report a Si3N4 resonator with 422 Million intrinsic and 3.4 Billion absorption-limited Qs. The resonator has 453 kHz intrinsic, 906 kHz loaded, and 57 kHz absorption-limited linewidths and the corresponding 0.060 dB m−1 loss is the lowest reported to date for waveguides with deposited oxide upper cladding. These results are achieved through a careful reduction of scattering and absorption losses that we simulate, quantify and correlate to measurements. This advancement in waveguide resonator technology paves the way to all-waveguide Billion Q cavities for applications including nonlinear optics, atomic clocks, quantum photonics and high-capacity fiber communications.

Correlation between particle size and magnetic properties in soft-milled Ni45Co5Mn34In16 powders

2021 ◽  
Vol 130 ◽  
pp. 107076
Author(s):  
D.L.R. Khanna ◽  
V. Sánchez-Alarcos ◽  
V. Recarte ◽  
J.I. Pérez-Landazábal
Keyword(s):  
Particle Size ◽  
Magnetic Properties
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