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| Effect of Temperature and Frequency on AC Nonlinear Properties of Epoxy Resin/Silicon Carbide Whisker Composites |
| Chen Xiangrong1,2,3, Huang Xiaofan1,2, Wang Qilong1,2, Wang Enzhe1, Zhang Tianyin1 |
1. College of Electrical Engineering Zhejiang University Hangzhou 310027 China;
2. Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou 311200 China;
3. Advanced Electrical International Research Center Zhejiang University Haining 314400 China |
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Abstract To investigate the AC conductive and dielectric properties at different temperatures and frequencies, the pure epoxy and epoxy resin/silicon carbide whisker (EP/SiCw) composites with different doping mass fractions were fabricated. The surface modification effect of the SiCw fillers, the cross-section micro-morphology of the samples, the phase structure information of the SiCw fillers and samples, the thermomechanical properties and glass transition temperature of the samples were investigated by transmission electron microscope, field emission scanning electron microscope, X-ray diffraction, dynamic mechanical analysis and differential scanning calorimetry, respectively. The effects of temperature and frequency on AC conductivity and dielectric properties of the samples were analyzed by the AC bias voltage module of the dielectric spectrum analyzer. The results show that for the same frequency and doping concentration, the nonlinear AC conductivity coefficient decreases with the increase of temperature, whereas the nonlinear dielectric constant coefficient, nonlinear AC conductivity switching field strength and nonlinear dielectric constant switching field strength increase with the increase of temperature. For the same temperature and doping concentration, the nonlinear AC conductivity coefficient and nonlinear dielectric constant coefficient both decrease with the increase of frequency, whereas the nonlinear AC conductivity switching field strength and nonlinear dielectric constant coefficient both increase with the increase of the frequency. The generation mechanisms of the nonlinear conductive property and nonlinear dielectric property at different temperatures and frequencies are explained by the double Schottky barrier model and the interface charge relaxation model, respectively. The results can provide experimental and theoretic reference to the high-temperature and high-frequency application of the EP/SiCw composites.
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Received: 02 March 2022
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2022, Vol. 37 
