Journal of Materials Research and Technology-JMR&T
·
2024
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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
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电气工程
✓ 已验证
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2024
·
IF 3.2
Xiaowei Wu,Zeming Fang,Xiaotao Zhu,Cheng Luo,Dan Li,Qianfa Liu,Ke Xue,Ke Wang
In high-frequency applications such as 5G-6G communication, internet of things, automotive radar, and automated driver-assistance systems, substrate materials excel as insulating layers owing to their superior dielectric properties. However, traditional methods for material development are often laborious and costly. To overcome these limitations, we employed molecular dynamics (MD) simulations to predict the dielectric properties of these materials at frequencies exceeding 10 7 Hz. Specifically, we selected thermosetting polyphenylene oxide (m-PPO) as the resin matrix and combined it with three crosslinking agents, respectively: triallyl cyanurate, triallyl isocyanurate, and trimethylallyl isocyanurate. Our overarching goal is to provide comprehensive insights into the development and enhancement of materials critical for high-frequency electronic devices. We anticipate that this methodology will be widely adopted for the development of advanced substrate materials across various applications, with the objective of effectively screening crosslinkers. Highlights Developed a simulation method to efficiently explore material scenarios for high-frequency applications. Studied the dielectric properties of m-PPO combined with three crosslinking agents at high frequencies. Successfully predicted dielectric properties using MD simulations.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
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IF 5.2
Haoran Wei,Wenhao He,Qiangzhi Li,Yuanying Yu,Renxin Xu,Jing Zhou,Jie Shen,Wen Chen
Dielectric composites with low dielectric constants ( ε ), low dielectric loss (tan δ ), and excellent thermal-mechanical stability are highly desired for high signal transmission speed and high device integration. Polytetrafluoroethylene (PTFE) based composites exhibit tremendous potential due to the outstanding dielectric properties and high-frequency stability of PTFE. However, achieving PTFE-based dielectric composites with thermal-mechanical stability and low dielectric constant is challenging. Herein, we develop a glass fiber/polytetrafluoroethylene (GF/PTFE) composite for high-frequency communication applications with a designed skeleton structure. By the paper-making process, the glass fiber can be dispersed in random directions to set up a skeleton with the PTFE matrix entering the space in the fiber network. The modification of GF was also carried out to low down the dielectric loss of the composite. Benefiting from the supporting effect of the skeleton structure and surface modification, the thermal-mechanical stable dielectric composite was achieved with a low dielectric constant, and dielectric loss remained (m-GF content = 15 wt%, ε = 2.326 and tan δ = 5.24 × 10 −3 at 30 GHz, xy-CTE = 29 ppm/°C and z-CTE = 47 ppm/°C). Moreover, the composites also have good dielectric constant frequency stability and thermal conductivity . Thus, this work provided an effective way to tailor the structure of functional composites with disordered fiber fillers.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2024
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IF 4.1
Leyao Zhao,Jing Sun,Qiang Fang
Two monomers with adamantane units as the linker and benzocyclobutene (BCB) groups as the crosslinking units have been successfully synthesized, and they are thermally treated to form polymers with a 5% weight loss temperature of up to 478 °C and a glass transition temperature of more than 350 °C. Among the polymers, the one containing fluorobenzene units displays a dielectric constant (Dk) of 2.58 and a dielectric loss (Df) of 1.94 × 10−3 at a frequency of 10 GHz. Such a fluoro-containing polymer also exhibits a water uptake of 0.12% even when immersing it in boiling water for 72 h. These results demonstrate that the two polymers are suitable as low dielectric materials for application in the fabrication of devices used in high-frequency communication.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
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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
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纳米技术
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电磁材料
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腐蚀工程
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半导体技术
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 20
·1-13
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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
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电气工程
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应用物理学
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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）