JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 15
·6354-6364
·
IF 3.5
Zhu Qijing,Zhang Chaoyun,Peng Xiaoling,Li Jing,Wu Qiong,Xu Jingcai,Hong Bo,Wang Xinqing,Ge Hongliang
Amorphous FeSiB/Al 2 O 3 soft magnetic composites were successfully fabricated in this work by applying an external magnetic field perpendicular or parallel to the magnetic toroidal surface, aiming to investigate the influences of magnetic field orientation on their structures and magnetic properties. The results indicate that amorphous FeSiB particles can form chain-like clusters aligned parallel to the direction of the applied magnetic field, which effectively reduces the magnetic reluctance along this direction. The magnetic toroidal with parallel orientation exhibits the highest effective magnetic permeability of 23.8 and a magnetic loss of 43.693 kW/m 3 at 590 kHz and 10mT, which is superior to both the non-oriented and perpendicularly oriented ones due to its optimized microstructure that reduces magnetic reluctance along the working circuit.
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 Superconductivity and Novel Magnetism
·
2023
·Vol. 36
·期 3
·923-929
·
IF 1.8
Zhang Chaoyun,Peng Xiaoling,Li Jing,Ellis Tristan,Wu Qiong,Xu Jingcai,Hong Bo,Wang Xinqing,Ge Hongliang
Fe 4 N/Fe 3 N soft magnetic composites (SMCs) prepared by gas nitriding were studied. In this paper, Fe 4 N was obtained by nitriding pure iron in NH 3 /H 2 , then nitrided by pure ammonia gas to obtain Fe 4 N/Fe 3 N SMCs. The morphology, structure, and magnetic properties were studied by SEM, VSM, B-H Tester, and Impedance Analyzer. With the increase of nitridation time, Fe 3 N content gradually increased and reached saturation after nitriding for 5 h, saturation magnetization M S decreased, and M s was equal to 178.4 emu/g when nitriding time reached 8 h. With the increase in frequency, the effective permeability of Fe 4 N/Fe 3 N SMCs decreases, and the core loss increases. The synthesis of Fe 3 N generally reduced the effective permeability and loss of Fe 3 N/Fe 4 N SMCs, except for the 8 h nitrided sample. With the increase in frequency, complex permeability also decreased and tended to be stable. 8 h nitrided SMC has the largest Q and μ′.
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
·
2023
·
IF 2.7
Kun Wan,Wei Liu,Yue Ding,Xu Zhu,Hailin Su,Xuebin Zhang,Zhongqiu Zou,Jinzhi Wang
FeNi powders were insulated with APTES by solution method and solidification method, respectively. Different coating mechanisms have been systematically studied according to analysis on microstructure, surface charge state, thermal stability of magnetic powders and magnetic properties of corresponding soft magnetic composites (SMCs). It was found that a slight amount of polysiloxane and amorphous silica would be deposited on FeNi powders in solution method, resulting in an ultra-thin insulation layer. In contrast, continuously increasing concentration of polysiloxane in reaction zone gives rise to a thick and smooth SiO 2 layer in solidification method. Owing to unique growth mechanisms of solidification method, it is easy to control the thickness of SiO 2 layer by adjusting the concentration of APTES, which is in favor of improving insulation quality. Accordingly, FeNi SMCs prepared in solidification method own much higher resistivity, lower μ ″ and lower tan δ (particularly at high frequency), compared with samples obtained by solution method with the same volume of APTES. Besides, increasing volume of APTES in solidification method leads to the decrease of both μ′ and μ″ . This work may not only provide novel insights into APTES-based insulation process, but also offer powerful technique for fabricating high-frequency SMCs.
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 MAGNETISM AND MAGNETIC MATERIALS
·
2020
·
IF 2.717
Yanglin Zhang,Xi'an Fan,Wentao Hu,Zigui Luo,Zhenjia Yang,Guangqiang Li,Yawei Li
In this paper, Fe soft magnetic composites (SMCs) coated with MnO 2 were prepared successfully by ball milling and following spark plasma sintering. The effect of MnO 2 content on microstructure and magnetic properties for the Fe/MnO 2 SMCs was investigated in detail. The analysis results show that a uniform MnO 2 coating layer can be formed on the surface of the Fe particles via low speed ball milling with agate balls. When the MnO 2 content increases from 0.0 wt% to 10.0 wt%, the thickness of the MnO 2 coating layer exhibits a growth trend. As a consequence, the increased nonmagnetic phase leads to the magnetic dilution, finally resulting in the reduced saturation magnetization and deteriorated coercivity. Moreover, the enhanced resistivity induced by the increased thickness, significantly reduces the generation of the inter-particle eddy current, which leads to more stable permeability and lower total core loss at high frequencies. This study provides a novel insulating coating layer to reduce total core loss and is advantageous for the development of iron-based SMCs.
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 Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Huaqin Huang,Rui Wang,Kaixuan Li,Bing Dai,Zhaoyang Wu,Peisheng Lyu
Optimising solid-phase reactions at the interface between an iron-based soft magnetic powder matrix and an inorganic oxide ceramic insulating layer in soft magnetic composites is an effective method to overcome the inverse relationship between magnetic conductivity and energy losses in these materials. However, solid-phase reactions at the interface are currently based on using highly reactive aluminium within iron-based soft magnetic powders. Herein, an interface reaction between ZnSO 4 and FeSiCr was successfully conducted to afford formation of FeSiCr-based soft magnetic composites, which are characterised by a three-layer structure comprising FeSiCr, a Si and Cr-rich layer and a ZnO·SiO 2 ·Cr 2 O 3 composite insulating layer. Thermal decomposition of ZnSO 4 releases O 2 , which induces the migration of Cr and Si atoms from the FeSi 3.7 Cr 4.5 soft magnetic powder matrix towards the interface and their subsequent reaction; this increases the magnetic phase content and enhances the crystalline structure order of the powder matrix. Furthermore, the ZnO·SiO 2 ·Cr 2 O 3 composite insulating layer effectively insulated the FeSiCr soft magnetic powder matrix. The resulting FeSiCr-based soft magnetic composite materials with the ZnO·SiO 2 ·Cr 2 O 3 composite insulating layer exhibit low core losses (58.5 kW/m 3 ), high magnetic permeability (39.1) and high saturation magnetisation (166.5 emu/g), indicating they are an ideal choice for high-performance electromagnetic components. The proposed innovative strategy of oxygen release through the thermal decomposition of salt compounds affords an insulating coating on soft magnetic composite materials fabricated based on interfacial solid-phase reactions.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Magnetochemistry
·
2024
·Vol. 10
·期 4
·23
·
IF 2.6
Yang Liu,Rui Wang,Kaixuan Li,Ran Chen,Zhaoyang Wu,Yang Li
This study proposes the thermal decomposition of salt compounds and doping of carbonyl iron powders (CIPs) to optimize the preparation of an insulating layer through the solid-phase interface reaction. First, (Fe–Si–Cr + CIPs)/ZnSO4composite powders were synthesized using the hydrothermal method and (Fe–Si–Cr + CIPs)/ZnO·SiO2·Cr2O3SMCs with a ZnO·SiO2·Cr2O3composite insulation layer were prepared through heat treatment and cold pressing. The effect of the CIP doping content on the microstructure and magnetic properties of the (Fe–Si–Cr + CIPs)/ZnO·SiO2·Cr2O3SMCs were then investigated. During the heat treatment, ZnSO4decomposed into solid ZnO and gaseous SO2and O2. The O2drives the solid-phase reaction, prompting the migration of nonmagnetic Si and Cr atoms from the interior of the Fe–Si–Cr soft magnetic powder to the surface insulation layer, finally forming the ZnO·SiO2·Cr2O3insulation layer. The doped CIPs also show good plasticity during the coating process, combining with the coating layer to fill the internal pores of SMCs. Moreover, as the particles are small with a high surface area, they increase the number of reaction sites for ZnSO4decomposition and facilitate the growth of the composite insulation layer, promoting its uniform distribution on the surfaces of the soft magnetic powders and CIPs. The lattice mismatch between the insulation layer and soft magnetic powder is reduced while the magnetic-phase content is increased, allowing the effective doping of CIPs sin the insulation layer. The magnetic properties of SMCs can be precisely regulated by changing the doping amount of CIPs. Unlike other insulating layer–preparation strategies based on the interfacial solid-phase reaction, the proposed method exploits the high plasticity and specific surface area of CIPs and removes the lattice mismatch between the insulation layer and soft magnetic powder.
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 MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 17
·13956-13967
·
IF 2.779
Sun Haibo,Zhou Guohua,Guo Zhili,Wang Ce,Wang Jinghui,Zong Changbao
The high-quality TiO 2 insulating layer on the commercial gas-atomized FeSiAl powder surface was efficiently prepared within a total time of 1 h at room temperature via a one-pot sol–gel method based on a developed industry-oriented coating equipment. The core-shell structure for the chemically coated FeSiAl powders was detected by the joint tools of SEM, EDS, and FTIR. Combined with the establishment of loss separation fitting model, the regulation mechanism analysis on soft magnetic properties was carried out for the FeSiAl powder cores insulated with different TiO 2 coating amounts. It is found that the interface-pinning effect, which is closely related to the core’s density, is an important factor affecting the magnetic properties of powder cores. With the elevating TiO 2 coating amount, the hysteresis loss, the excess loss, and DC-bias property of the core specimen exhibit the same increasing tendency, while the real part of complex permeability at 100 kHz gradually decreases owing to the increase of non-magnetic gap between the particles in the core, which can impede the domain-wall motion during magnetization. Correspondingly, the eddy current loss persistently decreases and contributes only 18.7% ~ 21.6% of total core loss when the precursor concentration is over 0.08 ml/g due to the formation of the intergranular insulated structure blocking the inter-particle eddy current flows in the composites. These results offer insights into subtly regulating magnetic properties when the adjusting process parameters for the soft magnetic composites are used in high-power and high-frequency 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 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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wangchang Li,Weichao Yang,Yao Ying,Jing Yu,Jingwu Zheng,Liang Qiao,Juan Li,Shenglei Che
FeSiAl soft magnetic composites (SMCs) with phosphate-silicone resin as the insulating layer were prepared by phosphating FeSiAl powder with K 3 PO 4 solution. The effects of K 3 PO 4 content on the microstructure and composition of the insulation coating were investigated. Further, the soft magnetic properties of SMCs were analyzed in detail. It is revealed that the annealed inorganic coating layer which predominantly consists of Al(PO 3 ) 3 , Al 2 O 3 , and P 2 O 5 exhibits a high resistivity, high temperature resistance and thin thickness, significantly reducing the eddy current loss. The outstanding magnetic properties of a power loss of 118.6 kW/m 3 (100 kHz, 0.1 T) and permeability of 63.8 were achieved for this high-quality thin insulation coating. Moreover, the magnetic loss was separated into hysteresis, eddy current and excess part, and the mechanism was analyzed in detail. The reduced total loss can be ascribed to the suppression of the eddy current. The novel SMCs coating with K 3 PO 4 are particularly suitable for applications in high frequency and high DC bias situations 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 Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Taehyeob Im,Kwiyoung Lee,Jonghyeok Ahn,Minjong Kim,Dongsup Lee,Jai-Sung Lee,Jongryoul Kim,Caroline Sunyong Lee
Fe-4.5Si-based soft magnetic composite (SMC) cores suitable for high-frequency applications were studied using ball milling and furnace sintering. Through ball milling, Fe-4.5Si powder was coated with Mg(OH) 2 nanoparticles to form a uniform insulation layer, introducing a novel method to optimize the furnace sintering process by adding H 3 BO 3 and SiO 2 to the insulation layer. Mg(OH) 2 nanoparticles effectively coated on Fe-4.5Si powder through ball milling formed MgO and Mg 2 SiO 4 double insulation layers after heat treatment, which provided stable insulation layer and minimized core loss in high-frequency regions up to 1 MHz. Furthermore, applying a 7% MgO–B 2 O 3 –SiO 2 insulation for sintering at 1100 °C resulted in an increase in permeability to 68, starting from its initial value of 28 at 100 kHz, while porosity decreased from 18.1% to 9.3%, minimizing the degradation of the insulation layer. After sintering, phase analysis of the MgO–B 2 O 3 –SiO 2 insulation revealed the presence of Mg 2 B 2 O 5 , MgSiO 3 , and a liquid phase, indicating densification of the cores owing to the diffusion reaction and liquid phase sintering among MgO–B 2 O 3 –SiO 2 . Therefore, the ball-milling and furnace sintering processes shown in this study provide an effective solution for increasing density of Fe-4.5Si powder-based SMC cores to develop magnetic cores suitable for high-frequency applications.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Danhua Liu,Xin Liu,Jian Wang,Xinhua Mao,Xiaochang Xu,Xi’an Fan
The effect of Fe nanoparticles with mass fraction of 0-7 wt% on the microstructure and soft magnetic properties of the Fe-6.5 wt%Si soft magnetic composites (SMCs) was investigated. The results show that the pores between Fe-6.5 wt%Si powders can be effectively filled by Fe nanoparticles , thereby correspondingly increasing the density of the SMCs. At the same time, the magnetic permeability of the SMCs mixed with different mass fraction of Fe nanoparticles has improved significantly and exhibits good frequency stability compared with the absence of Fe nanoparticles. It also reveals that the addition of 1 wt% Fe nanoparticles can reduce the eddy current loss of the SMCs by decreasing its intra-particle eddy current loss. When the addition of Fe nanoparticles is 3 wt%, the SMCs exhibits good magnetic properties with high magnetic permeability (increased by 24%) and relatively low core loss.
研究领域:
材料科学
·
磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 8
·4812-4818
·
IF 1.938
Li Wangchang,Wang Chun,Ying Yao,Yu Jing,Zheng Jingwu,Qiao Liang,Li Juan,Che Shenglei
Soft magnetic composites (SMC) with a bionic shell structure and a delicate, regular layered arrangement were prepared via a casting process. The permeability of composite samples was 140 at 5 MHz for plane anisotropy, while that of the spherical-particle-constructed material is only 14. According to classical loss separation results, the layered bulk material without an SiO 2 coating exhibited lower hysteresis loss. In contrast, the layered bulk material coated with SiO 2 showed lower eddy current loss, attributed to the increase in resistivity resulting from the SiO 2 coating. The magnetic loss of the layered bulk materials was 588 kW/m 3 at 50 mT and 100 kHz. SMC materials with this structure are anticipated to have strong potential for magnetic cores used in high-efficiency power supplies.
研究领域:
材料科学
·
电磁学
✓ 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）