JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
·
2018
·Vol. 25
·期 6
·624-629
·
IF 1.126
Huang Ke-yu,Dong Ya-qiang,Liu Min,Ren Ji-hang,Lu Shu-han,Zhao Zhan-kui,Chang Chun-tao,Wang Xin-min
Amorphous powder cores based on spherical (Fe 0.76 Si 0.09 B 0.1 P 0.05 ) 99 Nb 1 amorphous powder and their SiO 2 layer prepared by in situ coating insulation process were investigated in detail. These cores were characterized by scanning electron microscopy and X-ray diffraction analyses, and the results revealed that the surface layer of the amorphous powder was composed of SiO 2 with uniform surface coverage. The thickness of the SiO 2 insulating layer could be controlled by adjusting the tetraethyl orthosilicate (TEOS) content. By cold-pressing with epoxy resin under a pressure of 1800 MPa, a ring powder core with an outer diameter of 20.3 mm, inner diameter of 12.7 mm, and height of 5.3 mm was prepared. The FeSiBPNb composite core showed its best properties when the TEOS content was 2 mL/g (the volume of TEOS for each gram of (Fe 0.76 Si 0.09 B 0.1 P 0.05 ) 99 Nb 1 amorphous powder, mL/g), which showed good relative permeability in the high-frequency range of up to 10 MHz and a low core loss of 320 W/kg under the maximum magnetic flux density of 0.1 T and frequency of 100 kHz.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 16
·1-12
·
IF 2.8
Li Hao,Yang Yujie,Chen Congliang,Chen Dongyang,Zhang Yingming,Meng Yuting,Zhang Zhengyu
Low loss FeSiBCr soft magnetic powder cores were prepared by the joint coating of ZnO nanoparticles and epoxy resin. In this study, the content of ZnO nanoparticles and epoxy resin is regulated to find the best proportion of insulating coating. Scanning electron microscope exhibits that the surface of amorphous magnetic powders was covered with ZnO nanoparticles, and element distribution analysis also shows that ZnO nanoparticles are well coated on the surface of magnetic powder. The loss of soft magnetic composite materials were measured by B–H analyzer. The results show that the optimum mass ratio of ZnO nanoparticles to resin is 1:2, and FeSiBCr amorphous soft magnetic powder cores show the lowest loss of 209.4 mW/cm 3 ( f = 1000 kHz, B m = 20 mT).
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2022
·
IF 4.969
Ronglin Zhao,Jianjun Huang,Yu Yang,Lixin Jiao,Yaqiang Dong,Xincai Liu,Zhonghao Liu,Shouding Wu,Xubin Li,Aina He,Jiawei Li
In this work, a new type of FeSi/FeNi soft magnetic powder core (SMPC) was successfully fabricated by coating FeNi nanoparticles on the surface of FeSi micrometer powder. The effects of different contents of FeNi nanoparticles on the micromorphology, internal structures, and soft magnetic properties of SMPCs were studied. The results show that FeNi nanoparticles adhere to the surface of FeSi powder, which can effectively fill the air gap between FeSi powder and is beneficial to the compaction of the powder cores during the pressing process. Thus, the density of the SMPCs is increased. Compared to FeSi SMPCs, the comprehensive soft magnetic properties of FeSi/FeNi SMPCs have been greatly improved. When adding 15 wt% FeNi nanoparticles, the SMPCs exhibit excellent magnetic properties with high effective permeability (increased by 43.8 %) and low core loss (decreased by 22.1 %). The high performance FeSi/FeNi SMPCs prepared in this work are expected to be widely used in power choke coils, uninterruptible power supplies, and boosts and inverter inductors.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2022
·
IF 4.969
Xubin Li,Yaqiang Dong,Shouding Wu,Ronglin Zhao,Qian Ding,Xingjie Jia,Aina He,Jiawei Li,Xincai Liu
In this work, transverse magnetic field annealing (TA) was performed to FeSiBNbCu nanocrystalline powder cores (NPCs), and the magnetic properties, microstructure, and magnetic domain structure were in detail studied comparing with those after normal annealing (NA), and the mechanism of the improvement of soft magnetic properties by TA was elucidated. The experimental results show that the core loss of the sample is reduced by 14 % and the coercivity is reduced by 38 % after TA at 450 °C compared to the NA sample. The direct current bias performance of the TA sample is maintained at 67 % under a 100 Oe bias field. TA optimizes the soft magnetic properties of NPCs by optimizing the domain structure, reducing the formation of micro-vortex dots and broadening the size of the domain. These results can provide a good guide for optimizing the performance of NPCs with low core loss at high frequency.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 16
·14869-14877
·
IF 2.195
Zhang Yiqun,Dong Yaqiang,Liu Lei,Chang Liang,Zhou Bang,Chi Qiang,Wang Xinmin
A high-filling alumina/epoxy nanocomposite with improved thermal stability and insulation performance has been successfully designed as an organic–inorganic coating layer for the toroid-shaped FeSiBPNbCr amorphous magnetic powder cores (AMPCs). Unlike the organic coating, the organic–inorganic hybrid coating cores exhibited superior magnetic properties without compromising on saturation magnetization and permeability. The core loss declined by 40%, and the quality factor was 13% higher as half alumina was introduced into the epoxy resin matrix. A thin and uniform-coating layer of alumina/epoxy nanocomposite led to better high-frequency characteristics than those obtained with direct coating of the cores with alumina. Besides the outstanding magnetic properties, the Fe-based AMPCs with a convenient insulation-coating process cost lesser than Fe–Ni magnetic powder cores, thereby rendering the Fe-based AMPCs a potential candidate for a variety of industrial applications.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2023
·
IF 5.2
Ronglin Zhao,Yaqiang Dong,Shouding Wu,Xubin Li,Zhonghao Liu,Xingjie Jia,Xincai Liu,Hang Wu,Wei Gao,Aina He,Jiawei Li
The insulation coating plays a crucial role in minimizing core loss ( P cv ) in soft magnetic powder cores (SMPCs). In this work, we prepared ZrO 2 coating layer on FeSiBNbCu spherical powder by the hydrolysis-precipitation method and investigated the magnetic properties of the FeSiBNbCu@ZrO 2 nanocrystalline SMPCs. ZrO 2 coating layer were successfully fabricated on the powder by adding a proper amount of K 2 ZrF 6 in alkaline ethyl alcohol solution. The micromorphology and chemical structure of the ZrO 2 coating layer on the surface of FeSiBNbCu nanocrystalline powder, as well as the conversion mechanisms, has been investigated. The presence of the ZrO 2 coating reduces the P cv by significantly lowers eddy loss ( P e ) of the nanocrystalline SMPCs, meanwhile improves DC bias performance and slightly decreases their permeability. When the additive amount of K 2 ZrF 6 is 1.0 wt%, the nanocrystalline SMPCs has best comprehensive soft magnetic properties, including stable effective permeability ( μ e ) of 57.8 up to 1 MHz, excellent DC bias performance of 59.3 % at a bias field of 100 Oe, and the lowest P cv of 194.7 mW/cm 3 at a frequency ( f ) of 150 kHz and maximum magnetic induction ( B m ) of 50 mT.
研究领域:
材料科学
·
电气工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）