Dielectric Properties of SrTiO3/Epoxy Nanocomposites with High Thermal Conductivity

被引：0
|
作者：
Wen H. [1 ,2 ]
Zhang X. [1 ]
Wu Y. [1 ]
Yang Z. [1 ]
机构：
[1] School of Electrical Engineeringand Automation, Wuhan University, Wuhan
[2] Wuhan Branch, China Electric Power Research Institute, Wuhan
来源：
Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 04期
基金：
国家重点研发计划;
关键词：
Dielectric constant; Epoxy resin; SrTiO[!sub]3[!/sub; Surface discharge; Thermal conductivity;
D O I：
10.13336/j.1003-6520.hve.20190329019
中图分类号：
学科分类号：
摘要：
To investigated the morphology of the nanocomposites, thermal conduction characteristic and electrical properties of the composites, SrTiO3/epoxy nanocomposites have been prepared via facile solution-processing technique by incorporating SrTiO3 nanoparticles into the epoxy resin matrix with different loading amounts such as 1.72 vol%(7 wt%), 3.95 vol%(15 wt%), 7.2 vol%(25 wt%), and 13.44 vol%(40 wt%), respectively. The uniformity of dispersion in the absence of pinholes or cracks was verified in the cross-section SEM images of nanocomposites. It was found that thermal conductivity increased with SrTiO3 weight fraction, thermal conductivity of the SrTiO3/epoxy composite with 40% weight fraction rose up to 0.52 W/(m•K). The dielectric constant increased with the weight fraction and decreased with frequency. The Weibull distribution showed that breakdown strength of nanocomposites increased by about 25% after SrTiO3 incorporation. Moreover, the highest temperature on the surface of samples of nanocomposites was lower than that of pure epoxy when the surface breakdown happened under impulse voltage imposition. The creeping discharge inception voltage of SrTiO3/epoxy nanocompositeswith 40% weight fraction, compared with pure epoxy, increases by 47.4%, showing faster heat dissipation ability. Thus, adding SrTiO3 nanoparticles can improve the creeping discharge properties of epoxy resin dielectric materials. To sum up, adding SrTiO3/epoxy nanocomposites is beneficial to improving the thermal and dielectric properties, offering a basic reference for new insulation material development. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：1225 / 1233
页数：8
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