JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2023
·
IF 2.7
Meng Jin,Fan Zhao,Ming Liu
As a hotspot of soft magnetic composites (SMCs), the magnetic properties and loss characteristics of FeSiAl SMCs at high frequency need to be further optimized. In this study, the FeSiAl with flaky morphology was obtained by mechanical ball milling to improve its permeability, the reduction of power loss and the optimization of magnetic properties were achieved by the Ni 0.4 Zn 0.6 Fe 2 O 4 cladding layer. For comparison, phosphoric acid-passivated flaky FeSiAl was prepared. The results indicated that due to the good coating effect and high resistivity of NiZn ferrite, the Ni 0.4 Zn 0.6 Fe 2 O 4 coated flaky FeSiAl has a high permeability ( μ e ≈ 100) with extraordinary frequency stability in the range of 100 kHz–10 MHz, a higher quality factor with the peak occurs in higher frequency bands (Q = 72 at around 1 MHz), and a low relative loss factor of the order of 10 −3 –10 −4 in the range of 20 kHz–8 MHz. In addition, the ferrite-coated flaky FeSiAl also has outstanding high-frequency power loss performance, which can be explained by the coercivity in the VSM results and the reduced eddy current loss obtained by loss separation. This work broadens ideas for improving high-frequency applications of FeSiAl SMCs.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ping Wang,Peixi Wang,Jie Wang,Shoutao Lv,Jiaqing Wang,Hui Zheng
With the rapid development of wireless charging technology, there is a growing demand for ferrite materials with high permeability, high saturation magnetic induction intensity, and low power loss. This study aims to enhance the electromagnetic performance of NiCuZn ferrite by co-doping Nb 5+ and Li + . The influence of the doping levels Nb 5+ and Li + on the morphology, crystal structure, and electromagnetic properties of NiCuZn ferrite were studied in detail. Structural analysis shows that the lattice constant decreases as the Nb 5+ -Li + doping concentration increases, and the NiCuZn ferrite exhibits a high density and homogeneous microscopic morphology at the optimum concentration of x = 0.004. Specifically, at a doping concentration of x = 0.004, the magnetic permeability at 1 MHz measured at 1112.1, the saturation magnetic induction intensity reached 458.98 mT, and the power loss was minimized to 521.85 kW/m 3 , demonstrating significant improvement in the transmission power of wireless charging 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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 33
·25383-25391
·
IF 2.779
Zhang Cong,Liu Xiansong,Kan Xucai,Feng Shuangjiu,Zhu Yong,Yang Yujie,Zhang Zongyang
Soft magnetic composites serve in electrical applications and sustainable energy supply, the magnetic flux changes in response to changes of the applied magnetic field, with energy loss. To reduce the loss, in this paper, the soft magnetic composite Fe 50 Ni 50 powder coated with nano-SiO 2 was prepared by tetraethoxysilane sol–gel method, and the microstructure of the coating was characterized. Then, soft magnetic Fe 50 Ni 50 powder cores have been prepared, and annealed with different atmospheres. The power loss is lower when the magnetic cores were annealed in a reducing hydrogen atmosphere. The lowest power loss (1390.7 mW/cm 3 , f = 1000 kHz, B = 50 mT, 120 °C) was obtained when the cores annealed at 730 °C in H 2 atmosphere. The results show that the eddy current loss is significantly reduced by coating SiO 2 , and the power loss is reduced about 33% in high-frequency (1 MHz and 50 mT, 25 °C). From 25 to 120 °C, the power loss at 1 MHz decreases by about 33% due to the reduction of hysteresis loss and eddy current loss. The excellent properties are very applicable for the inductors of 5G technology.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 23
·9698-9707
·
IF 4.5
Zhang Cong,Chen Yanan,Feng Shuangjiu,Kan Xucai,Zhu Yong,Li Yue,Sun Wei,Shen Jibiao,Liu Xiansong
Currently, soft magnetic composites (SMCs) are usually used for high-current power devices. As a kind of SMCs, the FeSiAl magnetic powder core exhibits excellent magnetic properties, but it is difficult to improve its permeability and DC-bias characteristics. Thus, developing SMC s with high permeability and lower power loss remains a challenge. Here, the FeSiAl powder was mixed with carbonyl iron powder (CIP) which coated with nano-SiO 2 and pressed into toroidal magnetic core with silicon resin as adhesive. For MHz frequency, the SMCs with excellent power loss, saturation magnetization and permeability were obtained. Saturation magnetization of the mixed powder increased markedly with the CIP content increasing. For magnetic powder cores, the SEM and the mappings show that the large deformation CIP was helpful to improve core density. With the addition of CIP, the permeability and DC-bias properties were improved. In addition, the power loss was greatly reduced by the optimized annealing temperature.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2023
·
IF 2.3
Zhang Cong,Feng Shuangjiu,Kan Xucai,Chi Shangpeng,Sun Wei,Li Mingling,Liu Xiansong
Soft magnetic composites mean ferromagnetic powder coated by an electrical insulation layer, which is often used for high-power electromagnetic applications. In this work, toroidal magnetic cores such as FeSiAl and FeNi were fabricated by injection molding, and the electromagnetic properties were studied. Magnetic hysteresis loops of composite samples were measured at 25 and 100 °C to study the change of saturation magnetization and coercivity at room temperature and operating temperature. Effective permeability values of magnetic cores were between 8.8 and 18.9, and they were relatively stable within the frequency range of 70 MHz. Each kind of magnetic core shows low power loss at the frequency range of 100 kHz to 1 MHz, and the power loss of FeSiAl core was as low as 168 mW/cm 3 at 1 MHz and 20 mT. DC bias permeability of all samples exceeded 70% at a bias field of 300 Oe. Compared with the high-pressure molded core, the injection magnetic cores have lower power loss and good DC bias characteristics, which are beneficial to the application of high frequency and high current.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2018
·Vol. 124
·期 11
·1-7
·
IF 1.604
Yang Yan,Zhang Huaiwu,Li Jie,Gan Gongwen,Wang Gang,Wen Dandan
NiCuZn ferrite ceramics with high permeability, low power loss and excellent thermal stability are vital materials for high-frequency power devices. This paper analyzed grains growth and grain-boundary diffusion of Ni 0.2 Cu 0.2 Zn 0.6 Fe 2 O 4 ferrite ceramics at lower temperatures by adding optimized additives. X-ray diffraction reveals that the samples are pure spinel ferrite phase sintered at low temperatures. SEM images indicate that uniform and compact NiCuZn ferrite ceramics were obtained at 920 °C for 4 h, which is very advantageous for low-temperature co-fired ceramic (LTCC) technology. In addition, the ferrite ceramics with higher permeability (~ 411 @ 1 MHz), lower power loss in high frequency (~ 442 kW/m 3 @ 7 MHz) and good thermal stability were synthesized by controlling grains growth and grain-boundary diffusion. The results indicate that this ferrite ceramic material is a good candidate for the application of miniaturized power electronics in high frequency.
研究领域:
材料科学
·
电气工程
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Advances
·
2024
·
IF 8.1
Ting Sai,Pengfei Wang,Xiaoying Gu,Xueping Xu,Jinji Sun,Jing Ye
Cobalt-based amorphous alloys (Co-MG) demonstrate ultra-high permeability and remarkably-low power loss, positioning them as promising candidates for shielding (near-) static magnetic fields and addressing accuracy limitations in extremely-weak magnetic measurements. However , the brittleness and poor understanding about magnetic performance below 100 Hz have impeded their widespread adoption. To integrate satisfied processing, magnetic and mechanical performances, polystyrene-grafted Co-MG composites are developed. Compared with permalloy-1J85, Co-MG-( g -PS_35 %) composite exhibits 40 % increase in initial permeability, 48 % increase in saturation magnetization, 71 % reduction in remanence within shielding area. In contrast to Mn–Zn ferrite, Co-MG-( g -PS_35 %) composite demonstrates the power loss and μ ″/ μ ′ 2 values lower by an order of magnitude, resulting in magnetic noises 85 % lower at 1 Hz. Furthermore, the resultant composite maintains similar processing-rheological behaviors and mechanical properties compared with bulk polystyrene. It provides an innovative solution to expand real-world applications for biomagnetic detection, and overcome the sensitivity limitation of extremely-weak magnetic measurement.
研究领域:
材料科学
·
磁学
·
复合材料
·
生物磁检测
✓ 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）