CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Wanjiao Li,Jing Li,Hui Li,Feng Hu,Jingcai Xu,Bo Hong,Yunxiong Zeng,Xinqing Wang,Hongliang Ge,Xiaoling Peng
FeSiCr soft magnetic composites (SMCs) with yttrium iron garnet (YIG) coating layer were studied in this work. The YIG with nano size was synthesized by reverse co-precipitation method, which was coated on FeSiCr powders with different YIG contents. The effect of the annealing temperature on the FeSiCr/YIG SMCs was also investigated. It was found that a moderate amount of YIG ferrite could form a thin and uniform layer, resulting in significant optimizations in core loss, permeability, and DC bias characteristics. The results show that the FeSiCr/YIG SMCs with 0.75 wt% YIG exhibit the best magnetic performance ( P cv = 131.34 mW/cm 3 , μ e = 44.5 at 10 mT and 500 kHz). In addition, it was demonstrated that the FeSiCr/YIG SMCs with 0.75 wt% YIG presented the lowest core loss and largest permeability at the optimal annealing temperature of 500 °C. This study provides a new kind of FeSiCr/YIG SMCs which have good prospects to be used in high-frequency fields.
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 ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Wangchang Li,Xiang Zhou,Yue Kang,Ting Zou,Wanjia Li,Yao Ying,Jing Yu,Jingwu Zheng,Liang Qiao,Juan Li,Shenglei Che
Novel FeSiAl soft magnetic composites (SMCs) with a phosphate insulation coating doped with magnetic NiFe2O4 nanocrystalline particles were prepared. They exhibited high permeability, ultra-low loss, and high thermal stability. The saturation magnetization of the FeSiAl SMC increased, while the coercivity decreased due to the exchange coupling of the magnetic nanocrystalline particles. The total loss of the novel SMC decreased to 139.93 kW/m3 at 100 mT and 100 kHz, which is only one-third of that of common commercially available Sendust composites, while the permeability was up to 62 for the reduced demagnetization field. Furthermore, three-dimensional loss separation was performed based on the nonlinear regression method, and the complex permeability was separately addressed as the domain-wall movement and spin resonance parts. The minimum total loss was ascribed to the significantly reduced hysteresis loss and the slightly reduced eddy current loss, corresponding to the low coercivity (Hc = 0.341 Oe) and high impedance (|Z| = 67.1 MΩ). This was attributed to the improved magnetic properties and resistance of the insulation coating, which was related to the magnetic nanoparticles embedded in the insulation coating. The permeability was mainly derived from the spin resonance due to the complete insulation coating and ultrafine particles. This novel SMC with a phosphate insulation coating doped with magnetic NiFe 2 O 4 nanocrystalline particles provides a high-efficiency, high-frequency, and high-saturation soft magnetic device for switching power supplies, photovoltaic inverter boost inductors, and other applications.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Rongdi Guo,Guoliang Yu,Mingmin Zhu,Yang Qiu,Guohua Wu,Haomiao Zhou
Soft magnetic composites (SMCs) are extensively used for designing and manufacturing high-performance electronic devices, such as inductors, filters, mutual inductors and chokes, owing to their high effective permeability ( μ e ) and stable magnetic properties . However, the production of SMCs that meet the demands of high resistivity, high effective permeability ( μ e ), and low core losses ( P cv ), which are required for high-frequency miniaturized electronic systems, is challenging. In this study, we improve the electromagnetic performance of SMCs by coating FeSiCr metal particles with BaTiO 3 dielectric ceramic powder at various concentrations (0.00–3.75 wt%). The micro-morphological, static magnetic, resistivity ( ρ ), and core loss ( P cv ) properties of FeSiCr@BaTiO 3 SMCs are comprehensively investigated. Energy dispersive spectroscopy elemental distribution mapping is used to confirm the formation of core-shell structures with excellent coating quality. With an increase in the BaTiO 3 dielectric powder content, the core losses, P cv (at 800 kHz, 10 mT and 25 °C), initially decrease and subsequently increase, and comprise hysteresis losses ( P h ) and eddy current losses ( P e ). Moreover, owing to the introduction of the non-magnetic-phase BaTiO 3 powder, hysteresis losses increase monotonically, whereas eddy current losses exhibit the opposite trend. The FeSiCr@BaTiO 3 SMCs with 2.25 wt% BaTiO 3 dielectric ceramic powder exhibit outstanding comprehensive electromagnetic properties with an effective permeability of μ e = 48, saturated magnetization of M s = 115 emu/g, core losses of P cv = 42 mW/cm 3 (at 800 kHz, 10 mT and 25 °C), and resistivity of ρ = 2.74 × 10 5 Ω∙m. These state-of-the-art FeSiCr@BaTiO 3 SMCs present considerable potential for application in high-performance power devices and components.
研究领域:
材料科学
·
电气工程
·
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 13
·10131-10141
·
IF 2.779
Lu Hao,Dong Yaqiang,Liu Xincai,Liu Zhonghao,Ma Yan,Wu Yue,He Aina,Li Jiawei,Wang Xinmin
The phosphating treatment method has been extensively applied in the field of insulating soft magnetic powders because of its simplicity and ease of operation; however, the specific nanoscale morphology of phosphate coating layers and the interface/connection/interaction with the outer resin are still unclear. In this study, soft magnetic powder cores (SMPCs) with a nanoporous-structured phosphate coating were fabricated, in which the coating has a beneficial adsorption effect on the outer resin and can enhance the bonding force between the organic/inorganic coating. Optimized soft magnetic properties were obtained for the SMPCs with a phosphoric acid content of 0.6 wt%, including a high effective permeability of 61, low core loss of 134.6 mW/cm 3 (measured at 100 mT, 50 kHz), and high DC bias performance of 56% under a superimposed field of 100 Oe due to the favorable interactions between the insulating coating layers. These properties can be used to manufacture micro-magnetic components.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Qiyuan Gui,Chaoyun Zhang,Tongkang Zhan,Xiaoling Peng,Jing Li,Shan Tao,Qiong Wu,Jingcai Xu,Bo Hong,Xinqing Wang,Hongliang Ge
The magnetic properties of SMCs are typically challenging to further enhance, after compaction into a specific shape. However, in this study, a gas-nitriding process is employed to diffuse nitrogen atoms into iron-based magnetic toroidal after being prepared, resulting in an improvement in effective permeability and reduction in core losses. The results indicate that the saturation magnetization decreases with increasing nitriding time, reaching its minimum value at a nitriding time of 24 h, where Ms measure at 199.8 emu/g. The sample nitrided for 12 h exhibits superior effective permeability, high-frequency stability, DC-bias property, and total core loss, indicating its suitability for high-frequency applications. The gas-phase nitride process can further enhance the performance of the prepared soft magnetic composites, which is of significant value in scientific applications.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2019
·
IF 2.683
Kai Sun,Shuai Feng,Qian Jiang,Xiaofeng Li,Yaping Li,Runhua Fan,Yan An,Jiaqi Wang
The soft magnetic composites (SMCs) with high saturation magnetic flux density ( B s ) and low core loss ( P s ) have great potential in power electronics. In this work, the insulating SiO 2 -Al 2 O 3 layer was prepared by a hydro-thermal method to coat on the surface of the carbonyl iron powders (CIPs). Then, the coated CIPs were heterogeneously distributed in the reduced iron powders (RIPs) to fabricate the intergranular insulated SMCs. The scanning electron microscope (SEM) images and elements analysis confirmed that the surface of the CIPs was covered by a thin insulating layer forming a core-shell structure, and the Si-O-Al bond was detected by FTIR spectra. The resulting samples were annealed at 450 °C in N 2 atmosphere to eliminate the residual stress and improve magnetic properties. The annealed. SMCs containing 25 wt% CIPs@SiO 2 -Al 2 O 3 have optimum magnetic properties with a low P s of 106.9 W/kg and a highly approximate B s of 1.28 T (measured at 500 Hz). Compared with the conventional SMCs, the addition of the coated CIPs can suppress the adverse effect of the nonmagnetic coating layer on magnetic properties; meanwhile, the coated CIPs distributed in the RIPs can reduce the P s . This work provides a promising approach to the development of SMCs with low hysteresis loss and optimum magnetic properties at low frequency.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhangqiao Zhou,Qi Li,Xian Wang
As third-generation semiconductors advance toward higher frequencies, soft magnetic composites (SMCs) for extreme conditions require concurrent low-loss properties and environmental stability. The Fe-Cr-Si-B-C alloy offers inherent corrosion resistance over other soft magnetic alloys but requires modification for salt spray environment. Insulating coatings are critical for SMCs to meet high-frequency demands. Here, Fe-Cr-Si-B-C powder, engineered via powder atomic layer deposition (PALD), are coated with a nanoscale amorphous Al 2 O 3 layer that provides electrical insulation, physical separation, and enhanced environmental stability while maintaining minimal loss. The PALD-modified SMCs achieve a core loss of 433.3 mW/cm 3 (20 mT, 1 MHz) and 99.7 % corrosion inhibition efficiency. This work proposes a design strategy for high-frequency SMCs combining low loss and extreme environmental durability.
研究领域:
材料科学
·
纳米技术
·
电磁材料
·
腐蚀工程
·
半导体技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2019
·
IF 2.683
Zigui Luo,Xi'an Fan,Wentao Hu,Fan Luo,Jian Wang,Zhaoyang Wu,Xin Liu,Guangqiang Li,Yawei Li
In this work, Fe 2 SiO 4 /SiO 2 coated Fe-Si soft magnetic composites (SMCs) have been prepared successfully via ball milling Fe-6.5wt%Si/Fe 3 O 4 composite particles combined with subsequent spark plasma sintering (SPS) process. The formation mechanism of Fe 2 SiO 4 /SiO 2 insulating layer and effect of Fe 3 O 4 coating content on the microstructure and properties for the Fe-Si SMCs were investigated in detail. It is interesting that high temperature SPS process would lead to the occurrence of redox reactions between Fe 3 O 4 and Si from Fe-Si alloy cores, and resulted in the transformation from Fe 3 O 4 coating layer to Fe 2 SiO 4 /SiO 2 insulating layer. As a consequence, the novel Fe-Si SMCs exhibited superior performances including high saturation magnetization (190.4 emu/g) and low core loss (9.02 mW/cm 3 at 10 kHz) decreased by 89.1% compared to that of the uncoated Fe-Si SMCs (83.08 mW/cm 3 at 10 kHz). The results indicated that the method of preparing insulating layer by the redox reactions is a simple and effective way to synthesize new SMCs with high performance for electro-magnetic energy conversion equipments.
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 ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Zhixin Yao,Yuandong Peng,Chao Xia,Xuwu Yi,Shenghua Mao,Miantuan Zhang
The effect of calcination temperature on the coating layer and the phase of the alloy matrix is the main problem to improve the heat treatment process of SMCs and obtain excellent magnetic properties . In this study, FeNiMo@Al 2 O 3 powders which were coated by sol-gel and calcined at 900–1300 °C were prepared and these powders were pressed into SMCs. The results showed that the surface of the powder was uniformly coated with Al 2 O 3 . As the heat treatment temperature increases, the phase of the coating changed from AlOOH to γ-Al 2 O 3 , δ-Al 2 O 3 , θ-Al 2 O 3 , and α-Al 2 O 3 . Meanwhile, the new phase γ-Fe, Ni appeared in the alloy matrix. The magnetic permeability of the sample is very stable in the frequency range of 10–500 kHz. The magnetic loss decreases first and then increases, with a minimum at 1100 °C. The permeability and magnetic loss of the sample pressed from the powder obtained by calcination at 1100 °C are 321.78 mw/cm 3 and 87.61 (50 kHz, 100 mT) at the typical industrial application conditions of Iron–Nickel SMCs. The microstructure and the magnetic properties show that the obtained α-Al 2 O 3 have excellent insulation and heat resistance. This resulted in a significant reduction in core losses of FeNiMo SMCs.
研究领域:
材料科学
·
磁性材料
·
无机非金属材料
·
粉末冶金
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 20
·1-13
·
IF 2.8
Xie Linqiang,Ding Jiangtao,Liu Han,Lu Di,Yu Wanchun,Hu Te,Lin Jiayang,Cheng Zhenzhi,Gao Fei,Luo Guangsheng,Zhou Weiping
Soft magnetic composites with enhanced permeability and reduced power loss are urgently needed in the next generation of power electronics and electrical machines. However, traditional insulation techniques suffer from the uneven coating or complex process, which cannot meet these requirements. Here, the feasibility of Ba(OH) 2 as a coating layer of soft magnetic powder is explored. Due to its low melting point, Ba(OH) 2 exhibits good flowability in the molten state, enabling it to evenly coat FeSiAl particles and fill interparticle gaps, thereby forming a uniform, dense insulating layer. This novel coating strategy improves the formability of the magnetic powder cores and optimizes the cores’ soft magnetic performance. Compared with SMPCs without Ba(OH) 2 coating, FeSiAl@Ba(OH) 2 SMPCs have higher magnetic permeability (μ e = 59.5), higher quality factor ( Q max = 127.3), lower high-frequency power loss ( P cv = 2062.9 mW/cm 3 @1 MHz and 50 mT), and good DC bias performance. Our results provide a new approach for the design of insulation coatings for SMPCs, demonstrating significant application potential for high-frequency electronic devices.
研究领域:
材料科学
·
电气工程
·
应用物理学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Falong Wang,Yaqiang Dong,Liang Chang,Yan Pan,Qiang Chi,Mengji Gong,Jiawei Li,Aina He,Xinmin Wang
In this paper, a novel type of nano-CaCO 3 /epoxy nanocomposites insulating layer for the FeSiCr/carbonyl-iron soft magnetic composites (SMCs) has been successfully developed. The novel inorganic/resin nanocomposites can greatly reduce the core loss of the SMCs while maintain other excellent magnetic properties . By optimizing the content of insulating layer, the FeSiCr/carbonyl-iron SMCs exhibits the lowest core loss of 466.5 mW/cm 3 at a maximum magnetic induction of 50 mT and frequency of 100 kHz, which is greatly reduced by 24.2%, compared with the sample only coated by epoxy resin . Meanwhile, the effective permeability and quality factor remains high. In addition, the production process of the novel nano-CaCO 3 /epoxy nanocomposites insulating layer exhibits the advantages of simplicity, convenience and low cost compared with other ceramic coatings (Al 2 O 3 , MgO , SiO 2 , etc.) and surface nitride coatings, which is more suitable for the industrialization of molded inductors, and therefore has a variety of industrial application prospects.
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
·
2025
·
IF 2
Zhang Ling,Zhao Ronglin,Dong Yaqiang,Jia Xingjie,Zhang Bowei,He Aina,Li Jiawei,Shen Baogen
In the present work, the thermal stability, insulation performance, and magnetic properties of nanocrystalline soft magnetic powder cores (NSMCs) have been greatly improved, thanks to the successful creation of composite materials that combine inorganic nano-Cr 2 O 3 with organic epoxy resins. By coating the nano-Cr 2 O 3 /epoxy insulating layer on the FeSiBNbCu nanocrystalline powders, the core loss ( P cv ) of the FeSiBNbCu NSMCs is successfully decreased and the DC-bias performance is significantly enhanced. When the content of nano-Cr 2 O 3 is 0.3 wt.%, the FeSiBNbCu NSMCs demonstrate optimal comprehensive soft magnetic properties, including low P cv of 106.2 mW/cm 3 at 100 kHz/50 mT, high effective permeability ( μ e ) of 53.6 at the frequency of 1 MHz and DC-bias characteristics of 62% at a bias field of 100 Oe. As the coating layer of the NSMCs, the nano-Cr 2 O 3 /epoxy composite material has a straightforward, practical, and affordable production process. It is also more suited for industrialization and has a wide range of potential industrial applications.
研究领域:
材料科学
·
磁性材料
·
软磁复合材料
·
纳米材料
·
电气工程
✓ 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）