一种用于高频电气绝缘的可加工高导热环氧复合材料,其中含有多尺度颗粒

IF 23.2 2区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Advanced Composites and Hybrid Materials Pub Date : 2024-07-02 DOI:10.1007/s42114-024-00914-6
Yan-Hui Song, Li-Juan Yin, Shao-Long Zhong, Qi-Kun Feng, Haidong Wang, Pinjia Zhang, Hai-Ping Xu, Tong Liang, Zhi-Min Dang
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引用次数: 0

摘要

可再生能源电网中的固态变压器(SST)正以高电压、高频率的方式发展,这往往会导致设备发热量急剧增加,加速绝缘材料的失效。环氧树脂(EPR)因其优异的电气绝缘性能、加工性能(粘度)和低廉的价格,通常被用作 SST 的绝缘材料。然而,EPR 的导热系数仅约为 0.2 W/(m-K),这导致其在高频和高温下的绝缘性能较差。为了提高导热性,需要在 EPR 中加入大量高导热粒子,但同时也会严重增加电气绝缘缺陷和粘度。本研究采用多尺度颗粒填充法研究复合材料的导热性、加工特性和高频电气绝缘性能。填充了 25 µm BN 和 5 µm SiO2 颗粒的复合材料将热导率提高到了 0.732 W/(m-K),在 10 kHz 和 20 kHz 双极方波下均表现出优异的电绝缘性能(相对 EPR 分别提高了 131.76% 和 163.97%)以及良好的加工性能。同时还发现,复合材料的介电损耗、热导率和电场分布是影响其在 10 至 20 kHz 高电压下电气绝缘性能的主要因素。 图文摘要
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A processable high thermal conductivity epoxy composites with multi-scale particles for high-frequency electrical insulation

The solid-state transformer (SST) in the renewable energy grid is developing in the way of high voltage and high frequency, which often results in a sharp increase in heat production of the equipment and accelerates the failure of the insulating materials. Epoxy resin (EPR) is commonly used as an insulation material for SST due to its excellent electrical insulating properties, processing performance (viscosity), and low price. However, the thermal conductivity of EPR is only about 0.2 W/(m·K), which leads to poor insulating performance under high frequency and temperature. To enhance thermal conductivity, a substantial quantity of highly thermally conductive particles is incorporated into the EPR, accompanied by a severe increase in electrical insulation defects and viscosity. This study utilized a multi-scale particle-filled approach to investigate the thermal conductivity, processing characteristics, and high-frequency electrical insulation performance of composites. The composite, filled with 25 µm BN and 5 µm SiO2 particles, enhances thermal conductivity to 0.732 W/(m·K) and demonstrates superior electrical insulating properties at both 10 kHz and 20 kHz bipolar square waves (with an increase of 131.76% and 163.97% in relative EPR, respectively), as well as good processability. Meanwhile, it is found that the dielectric loss, thermal conductivity, and electric field distribution of the composite are the main factors affecting the electrical insulating properties from 10 to 20 kHz under high voltage.

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来源期刊
CiteScore
26.00
自引率
21.40%
发文量
185
期刊介绍: Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.
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